[Q] Brightness changing while watching youtube? - Asus Eee Pad Transformer Prime

Hey guys I have a quick question. I was watching a youtube video in my room last night in complete darkness on the lowest brightness setting and I noticed the brightness would change slightly at random. I also noticed it on the skyrim live wallpaper and also while scrolling thru the marketplace. It appeared that when there were more white pixels on the screen then the screen would get slightly brighter. This doesnt happen in netflix or movies that i put on there so I'm hoping this is a software bug happening in google apps. Autobrightness is not on and i tried all the power modes with the same response. Anyone else notice this or also able to replicate this? Thanks!

hey dude!
I have the same issue! I think it is on purpouse. Some kind a way to save power? Here is my thread about this. Try my country and please give me some feedback. Most of users dont notice this. Maybe because their eyes are not so sensitive?
Oh and also if you switch to power saving mode the brightness change will much more significant than on the other two modes
http://forum.xda-developers.com/showthread.php?t=1419583

Really no one of you have this issue?

Sounds like a possible LCD screen flickering problem. It's a problem a lot of LCD display mobile devices have. My HTC Sensation has it.
Here's how to test it: at night, turn off all the lights in your home. Basically, your test area needs to be as dark as possible. Set your Prime to a set brightness, preferably as low as it can go. Open up something that has a uniform color and general brightness throughout, XDA app works perfectly. Go near a wall and point the display at the wall. Start scrolling back and forth through the app.
If your device has screen flickering, you should notice that the light on the wall rapidly fluctuates whenever you scroll.

will try. but i wonder if this is relatd to tegra 3 power saving system? i notice the brightness / contrast automaticly change while watching movies, surfing web and gaming despite off turning off autobrightness
so the question is. is my prime damaged or this is normal? dear xda users please how does your prime behaves?

It could also be a "feature" called dynamic contrast which is an idiotic way of making LCDs look like they have more contrast than they really have. But I hope it isn't, I despise it. Dynamic contrast works like that: during bright scene it brightens the screen, and during dark scene it darkens the screen. It's really annoying (and shouldn't be on ever apart from maybe when watching movies).

ok but the question is. how many of you noticed this issue?

Orion66 said:
ok but the question is. how many of you noticed this issue?
Click to expand...
Click to collapse
I think everyone.
For youtube don't use eco. It's to aggressive and outside of normal videos apps like diceplayer it is useless.
I hope nVidia and Asus will decrease it or give us the option to disable it. Because i like the eco mode for watching flash videos. Much better than Balance and Normal because it's enough and i can save battery.
Magnesus said:
It could also be a "feature" called dynamic contrast which is an idiotic way of making LCDs look like they have more contrast than they really have. But I hope it isn't, I despise it. Dynamic contrast works like that: during bright scene it brightens the screen, and during dark scene it darkens the screen. It's really annoying (and shouldn't be on ever apart from maybe when watching movies).
Click to expand...
Click to collapse
No, it's not for contrast. It's for saving energy by decrease the screen brightness and increase the color level. And it's always doing it. What we see are the problem of the technique.

Well if it is on purpose then it is very annoying. The only thing that helps a bit is to make screen brighter.
I hope it is not a defect of the screen.

Was looking for a thread with this issue, I'm also experiencing this effect.
It's also noticeable with the stock browser, seems some powersaving technique. Hopefully they will optimise it in ics or make it an option.

this DIDIM technology is constantly at work on our device. I saw a Ram dump txt(which I don't know where it came from) in ly Astro explorer. I looked at it and seen that DIDIM feature is constantly working and adjusting.

demandarin said:
this DIDIM technology is constantly at work on our device. I saw a Ram dump txt(which I don't know where it came from) in ly Astro explorer. I looked at it and seen that DIDIM feature is constantly working and adjusting.
Click to expand...
Click to collapse
Any idea how to disable it?

eL_777 said:
Hey guys I have a quick question. I was watching a youtube video in my room last night in complete darkness on the lowest brightness setting and I noticed the brightness would change slightly at random. I also noticed it on the skyrim live wallpaper and also while scrolling thru the marketplace. It appeared that when there were more white pixels on the screen then the screen would get slightly brighter. This doesnt happen in netflix or movies that i put on there so I'm hoping this is a software bug happening in google apps. Autobrightness is not on and i tried all the power modes with the same response. Anyone else notice this or also able to replicate this? Thanks!
Click to expand...
Click to collapse
You guys know that it's not the power setting right? It's in the screen setting under brightness. If you set it to auto, it will adjust depending on your light source, if it's all white, it will be bright in a dark room and will adjust itself. Turn it off, adjust manually.

And you know, its not. It sets brightness high of overall picture is bright and dark if picture is dark... Much like dynamic contrast. It has nothing to do with auto brighteness. I tried that first.
But can I believe it was fixed in some update, since no one continues this thread after ICS? I cannot update becouse of unknow SN bug. Waiting for Asus to say either send it back or release fix. Thanks.

Happening to me right now with ICS, in performance mode, docked with charger in.

I've been noticing subtle changes in brightness no matter what performance mode I'm in, and I always have auto-brightness off. I normally keep the device in Balanced mode. It's most noticeable if I'm watching videos before bed, as I have the device brightness near minimum, and any change in brightness is pretty clear. At first I thought it was something to do with BS Player, but I've been using Dice as well and see the same effect. It may be a little better on ICS than it was with Honeycomb, but it's hard to tell.
If this is DIDIM, then I guess there's not much I can do about it besides hoping nVidia/Asus tunes the effect to be a little more subtle. :-/

I notice it, however it only affects me with low brightness/auto brightness setting. It does NOT kick in for me over 15/20% brightness combined w/ balanced/normal mode.
That is still on HC, wont get ICS update until two weeks.
Can also be noticed when canging homescreen tabs, slide it over slowly with your finger on the display (keeping it from flipping), once moved more than 30%, the display dims.

I am experiencing this brightness fluctuation, in all power modes, with auto brightness turned on or off.
Very annoying.

newfie99 said:
I am experiencing this brightness fluctuation, in all power modes, with auto brightness turned on or off.
Very annoying.
Click to expand...
Click to collapse
Thing that annoys me the most is that it does it with a freakin live wallpaper lol. I guess the snow falling in the skyrim live wallpaper triggers it or something but it is annoying and still exists in ICS. Oh well, maybe they will tone it down soon... here's to hoping.

Ciddy said:
I notice it, however it only affects me with low brightness/auto brightness setting. It does NOT kick in for me over 15/20% brightness combined w/ balanced/normal mode.
That is still on HC, wont get ICS update until two weeks.
Can also be noticed when canging homescreen tabs, slide it over slowly with your finger on the display (keeping it from flipping), once moved more than 30%, the display dims.
Click to expand...
Click to collapse
I'm running the newest ICS update (9.4.2.11) and it's still doing it. The dimming at 30% home screen scrolling still happens too. i'm pretty sure it's DIDIM

Related

Auto brightness

Does anyone have a solution to auto brightness issue?
Even in the darkest room, the lowest light level is "medium" and not low! Its excellent setting when using phone outdoors but in dark room or at night its just too bright. Is my phone broken or is it general windows phone setting?
Sent from my TITAN X310e using Board Express
on my titan, the auto brightness behaviour is erratic and sometimes goes too low.
the camera is one of the issue triggers. after every return from a photo session, the screen goes to a lower brightness.
also, sometimes it happens when unlocking the phone but i don't know what triggers it. then suddenly the screen would return to its normal brightness after a few seconds, although not always.
i suppose it's a driver issue...
antaed said:
on my titan, the auto brightness behaviour is erratic and sometimes goes too low.
the camera is one of the issue triggers. after every return from a photo session, the screen goes to a lower brightness.
also, sometimes it happens when unlocking the phone but i don't know what triggers it. then suddenly the screen would return to its normal brightness after a few seconds, although not always.
i suppose it's a driver issue...
Click to expand...
Click to collapse
so you get the autobrightness to go as low as 'low' set manually? - I tried it but even after camera the lowest brightness I am getting is same as 'medium' when set manually!
drupad2drupad said:
so you get the autobrightness to go as low as 'low' set manually? - I tried it but even after camera the lowest brightness I am getting is same as 'medium' when set manually!
Click to expand...
Click to collapse
no, not that low only lower.
but you are right, even in complete darkness the screen won't go to its lowest setting...
Yes same issue here.
Automatic can go a little bit lower than medium, but not much. Too bright in dim environement.
For general use, i would like to have a preset between low and medium
Since these days many people like ultra bright screens (and ultra loud sound) i am not sure HTC will try to fix this "issue".
I just hope Microsoft can add a brightness slider in the future. (Or bility to set the min auto and max auto levels)
Btw, do you know why camera mode go into max brightness ? This is a little harsh indoor.
crmb said:
Yes same issue here.
Automatic can go a little bit lower than medium, but not much. Too bright in dim environement.
For general use, i would like to have a preset between low and medium
Since these days many people like ultra bright screens (and ultra loud sound) i am not sure HTC will try to fix this "issue".
I just hope Microsoft can add a brightness slider in the future. (Or bility to set the min auto and max auto levels)
Btw, do you know why camera mode go into max brightness ? This is a little harsh indoor.
Click to expand...
Click to collapse
Yes that behaviour is very strange too! I think it's present only in the Titan. Some other windows phone manage the camera brightness a little better. But then I think increased brightness while using camera sort of makes it little pleasant when using it outdoors. But indoors as you mentioned, it's a bit too harsh brightness!
I think it's the light sensor that doesn't work properly. Some places/forums mentioned about issues with various HTC driverseven after those 2 softwares updates we received in Nov-early Dec.
In daylight,the auto brightness works wonderfully for me,I never change it.
But in a fairly dark room,it's too bright and most of the time,I set it to low
I usually set it to medium... and set to low by myself by night.
I have sent a message to HTC (via theirs contact/ticket system) about the "can be improved" auto brightness, and "camera set brightness to max" issues.
Better than nothing.
Since this is a easily reproductible problem, maybe they can take a look if they receive several messages about this.
I wonder if the screen going to max brightness with camera may have something to do with the "HTC Camera modes" addon ? (who knows..)
But i don't see how to remove it. I even can't find it on the marketplace (under HTC section).
I have same issue, I get blinded when I check the time on my phone at night
It was there even before camera modes update was applied by HTC. So unlikely
Sent from my TITAN X310e using Board Express
Obviously, the brightness go to max too when using skype with video.
Hope they will notice and fix it.
Trying to talk to HTC customer service is especially unhelpful here in france.
They have absolutely no knowledge of theirs WP7 products
(whatever the problem encountered)
Now that we have unlocked roms, any way to tweak the auto brightness ?
crmb said:
Now that we have unlocked roms, any way to tweak the auto brightness ?
Click to expand...
Click to collapse
I've tried all 4 ROMs and they have the same behaviour as stock ROM at the moment. But it might be useful looking into the registry threshold values. I know there is some sort of home brew app that lets us set the volume increase in 10s, 20s, 30s or 50s. So a regedit might be somewhere, will dig around myself since you've reminded me again

[Q] Reduce screen brightness?

Hey everyone-
I'm looking for a way to reduce my backlight brightness further than the normal levels. I use my Evo as a night clock, but the minimum brightness still beacons a bit in a dark room. I believe this is possible, but I'm not sure what I'm missing. I tried out an app called RootDim from the market. It lets you move the slider from 0 - 255. The screen gets darker as you slide it backwards, but it stops dimming when you hit 30. Anything below that does nothing. I thought it might be a kernel issue, so I flashed the nolights kernel to test, but that didn't change anything.
I am also aware of screen filter, but that doesn't actually dim the backlight. Anyone out there no of a way to drop the minimum backlight level below 30?
EDIT: I should also mention that I'm using Android Revolution as my ROM. Thanks.
Been looking for the same thing as well. I was hoping RootDim would help , but I got the same results.
Have you tried DOCK mode ? It's a built in APP on HTC EVO 3D.
Do a Search for DOCK and try it. It runs in Lanscape mode and it
switches to a night mode after a few minutes or you can switch
manually via the lower right lower corner.
Rich
Try screen filter
Sent from my PG86100 using XDA App
backlund said:
I am also aware of screen filter, but that doesn't actually dim the backlight.
Click to expand...
Click to collapse
I tried that already. And I'm using Dock Mode. The problem is that even at minimum brightness, black color still lights up the room a bit. Considering that it stops dimming at < 30, I'm assuming there must be some way to get levels between 0 and 30 as well. I guess it stops at 30 as a safety net, to keep you from dimming it so much that you can't see the screen.
Bumping this. I feel like cyanogen let me go darker but I'm back on sense and am looking for a solution.
I use the Android Assistant app, free at Google Play. It will let me take the brightness down to 11. Not sure if this would be low enough for you. The control is in Tools, Save Battery.
Any update on this? Whenever I'm in a dark room my lowest brightness still seems too bright. Is there any way to get it darker?

[Q] Full Brightness waves

I am using z2 about 10 monts. Today i feel when i put mobile full brightness i observed some wave running from top to bottom. Specially observed when open NDR utility and es file explorer. Before appearing the both applications interface waves appear for instance. I am worried is it ok or some problem. And also today observed brightness bright more autometically, althoug i am on full brightness. Any help suggestion Thanks in advance
I've noticed the brightness change on its own too sometimes. I always use full brightness (adapt to lighting conditions disabled) and randomly, I'll notice my screen get brighter or darker sometimes. It's completely random, not sure what causes it.
bdithug said:
I've noticed the brightness change on its own too sometimes. I always use full brightness (adapt to lighting conditions disabled) and randomly, I'll notice my screen get brighter or darker sometimes. It's completely random, not sure what causes it.
Click to expand...
Click to collapse
Omg I thought I was the only one, My brightness is set at 100% when I quickly unlock the phone I notice a quick dimming on the screen even though it's at full brightness...
naeem123 said:
Omg I thought I was the only one, My brightness is set at 100% when I quickly unlock the phone I notice a quick dimming on the screen even though it's at full brightness...
Click to expand...
Click to collapse
Yup I have the exact same thing. Not sure if others have it as well, but as far as I'm concerned, it's normal (I hope)

Minimum brightness

You don't want to give your significant other yet another reason to yell at you while you're reading XDA in bed. Rate this thread to express what you think of the Samsung Galaxy S7 Edge's display minimum dimness. A higher rating indicates that the display can get extremely dim, ideal for reading in very dark environments.
Then, drop a comment if you have anything to add!
I don't have on auto brightness or any power saving features on yet my display brightness seems to have a mind of its own. I can be in a dimly lit room and have to put my brightness slider past the halfway mark just to get decent brightness and the always on display will be so dim it's barely visible. Other times I could be in a well lit store or outside and the display will be very bright even with the slider nearly all the way down. It also seems the always on display may get brighter the longer it's on but it starts out very dim even if my brightness is cranked up. I really don't know what to make of it. Sometimes the display brightness seems way worst then my nexus 6p (not saying 6p has bad brightness just using as a reference cause most reviewers claim the brightness on note5/s7 is a bit brighter.) Other times the quality seems better then my friend's note 5.
Adaptive brightness? Sure sounds like it.
I am disappointed it does not go low enough like all android phones tablets etc. I read books in the Kindle app in bed and my iPhone or I pad can go very low brightness but all the android gadgets I have cannot they are always too bright and annoy her. I thought this could be the one but I guess not
Tezray said:
I am disappointed it does not go low enough like all android phones tablets etc. I read books in the Kindle app in bed and my iPhone or I pad can go very low brightness but all the android gadgets I have cannot they are always too bright and annoy her. I thought this could be the one but I guess not
Click to expand...
Click to collapse
Install LUX Auto brightness app and it should solve your problem, in fact you can set it so dim that you can hardly read it.
I find the always on display to bright. Is there a way to dim it a bit?
Kapitein187 said:
I find the always on display to bright. Is there a way to dim it a bit?
Click to expand...
Click to collapse
I totally agree with that, when you cover the sensor the brightness is way better.
It should be part of the environment, now it's more like "HEY LOOK AT THE TIME" kinda distracting
JeffreyNijnatten said:
I totally agree with that, when you cover the sensor the brightness is way better.
It should be part of the environment, now it's more like "HEY LOOK AT THE TIME" kinda distracting
Click to expand...
Click to collapse
Yeah haha. The funny thing is that the "night clock" is perfectly dimmed. Wished that there was a setting for the AOD (always on display) to have manual brightness controll. And of course app notifications. Which the edge display can show, but the AOD can not. Strange decision of our Sammy friends.
Kapitein187 said:
Yeah haha. The funny thing is that the "night clock" is perfectly dimmed. Wished that there was a setting for the AOD (always on display) to have manual brightness controll. And of course app notifications. Which the edge display can show, but the AOD can not. Strange decision of our Sammy friends.
Click to expand...
Click to collapse
Exactly, that would be perfect, I tried using AOD at work today and it's so distracting that it's actually worthless now. I also tried the night clock at work and it looks great, it doesn't bother me at all and it's very handy. Hope samsung will update AOD because it can be very useful.
But in my opinion the overall (auto) brightness is too bright, when I dim my screen it automatically brighten the display up to what it thinks it is the right brightness compared to the environment . With my previous phone (LG G2) it changed the auto brightness to the user preference.
You can fix this issue, set brightness 100% and reboot.
Hi guys, I noticed right now that if I switch from an high luminosity environment to a very dark one, automatic brightness remains the same and I have to uncheck and check again the "auto" option on notification bar. Other times, in same conditions, it adapt the brightness after some times instead of immediately. Dose have my phone problems?
turtuv said:
Hi guys, I noticed right now that if I switch from an high luminosity environment to a very dark one, automatic brightness remains the same and I have to uncheck and check again the "auto" option on notification bar. Other times, in same conditions, it adapt the brightness after some times instead of immediately. Dose have my phone problems?
Click to expand...
Click to collapse
This is to prevent the display continue changing brightness, it does change but it has a delay so your screen isn't flickering bright, dark, bright, dark.
---------- Post added at 09:37 PM ---------- Previous post was at 09:35 PM ----------
Kapitein187 said:
I find the always on display to bright. Is there a way to dim it a bit?
Click to expand...
Click to collapse
This has been fixed with the update that came out this week #yay! It's now changing automatically, not as distracting anymore :highfive:
I noted that when I turn on the screen I a low light environment, it has a fade before the screen completely turn on, like a fade effect. I did some tries and this happen only in low light condition. Is this normal?
JeffreyNijnatten said:
This is to prevent the display continue changing brightness, it does change but it has a delay so your screen isn't flickering bright, dark, bright, dark.
Click to expand...
Click to collapse
Yes, but if I put the phone orizonthal (for instance I put I on the table) the brightness change immediately. Why is that?
Sended from my Samsung Galaxy S7 Edge Gold Platinum
its too bright :/
turtuv said:
I noted that when I turn on the screen I a low light environment, it has a fade before the screen completely turn on, like a fade effect. I did some tries and this happen only in low light condition. Is this normal?
Yes, but if I put the phone orizonthal (for instance I put I on the table) the brightness change immediately. Why is that?
Sended from my Samsung Galaxy S7 Edge Gold Platinum
Click to expand...
Click to collapse
Does someone know something about that?
Sended from my Samsung Galaxy S7 Edge Gold Platinum
Anyone use Night Mode app? Can configure it to be like ios night mode.
ssgunner20 said:
Anyone use Night Mode app? Can configure it to be like ios night mode.
Click to expand...
Click to collapse
What does it exactly?
Sended from my Samsung Galaxy S7 Edge Gold Platinum
Very good
turtuv said:
Hi guys, I noticed right now that if I switch from an high luminosity environment to a very dark one, automatic brightness remains the same and I have to uncheck and check again the "auto" option on notification bar. Other times, in same conditions, it adapt the brightness after some times instead of immediately. Dose have my phone problems?
Click to expand...
Click to collapse
Hi.. I have the same problem! Every time I switch form a environment with more or less luminosity I have to unchek and check again the "auto" option on a notification bar.. Do you founded out any solution?
caxopa said:
Hi.. I have the same problem! Every time I switch form a environment with more or less luminosity I have to unchek and check again the "auto" option on a notification bar.. Do you founded out any solution?
Click to expand...
Click to collapse
Do you have MM or Nougat? I noticed the same in MM but it works significantly better in Nougat.
The problems some of you have ... seriously? ?

Dark scenes difficult too see in movies

I have a Samsung Galaxy Tab S3 and it's great but I can't figure one thing out. Which is the screens contrast. Dark scenes in Netflix or VLC player are too dark and hard to see. I tried different brightness settings, with/without blue light filter and the other color correction option for cinematic mode but nothing really works properly.
Is this an issue with the tablet or is there another setting to change the contrast or something?
man_with_hair said:
I have a Samsung Galaxy Tab S3 and it's great but I can't figure one thing out. Which is the screens contrast. Dark scenes in Netflix or VLC player are too dark and hard to see. I tried different brightness settings, with/without blue light filter and the other color correction option for cinematic mode but nothing really works properly.
Is this an issue with the tablet or is there another setting to change the contrast or something?
Click to expand...
Click to collapse
I also noticed this with Netflix. Was hoping that turning up the brightness would help but it doesn't.
YES, YES, YES, I am shocked this isn't widely reported, I couldn't find almost anything about it and I've been searching for quite a while.
First of all it is really crazy that popular apps like plex or netflix don't offer any capability to change the brightness of the video played. No, we don't change the colorspace, black levels, bla bla bla.
I DID find eventually a solution (the ONLY one that works, a bit clumsy as it is): http://phandroid.com/2016/03/22/twilight-app-reduces-dark-contrast-on-samsung-galaxy-s7/ (yes, it's for the S7 and yes I did notice there the same issue, which makes it even crazier that it isn't something widely known and fixed).
I just picked up an S3 last night and I'm having this same issue. I watched the opening scene of The Defenders on Netflix, and I could hardly tell what was going on. Rewatched it on a proper display, and you're clearly upposed to tell it's Danny Randy much earlier in the scene, but I had no idea in the S3 until a blue light was clearly shining on him from above.
I used Twilight on my Nexus 7 because it lacked a night vision mode, ala blue light filter on the S3. I'm not sure how that can really help. Surely other people have found more elegant solutions to this problem? I've opened up other media files and they're all simply too dark. I get it's an HDR screen, but surely it has a mode for non-HDR content!
Do oled display have a blue light problem, I though it was only really a led thing.
John.
Might be an inconsistency with the displays. I have no problem with mine. Not getting any lag either but running a heavy debloated rom also. Battery life could be better. It's stupid you can't turn off the Wacom digitizer when s pen not in use. On my note 4 when I lost my s pen battery life was terrible because the Wacom digitizer stayed on. Should be an option in settings to turn it off. If anyone knows how please let me know. I don't use the s pen very often.
man_with_hair said:
I have a Samsung Galaxy Tab S3 and it's great but I can't figure one thing out. Which is the screens contrast. Dark scenes in Netflix or VLC player are too dark and hard to see. I tried different brightness settings, with/without blue light filter and the other color correction option for cinematic mode but nothing really works properly.
Is this an issue with the tablet or is there another setting to change the contrast or something?
Click to expand...
Click to collapse
Try switching from "adaptive display" to "oled cinema".
Sent from my SM-T820 using Tapatalk
DAvid_B said:
Try switching from "adaptive display" to "oled cinema".
Sent from my SM-T820 using Tapatalk
Click to expand...
Click to collapse
Switching to modes other than Adaptive Display just gives me seemingly the same shade of yellow....
I have tab s2 and you can't change adaptive display. I wouldn't have bought this tablet if I'd known about this issue. Very annoyed.
I actually have the issue on my Samsung Tab S2, that the colors are really "hard" and lots of color information are missing in the video, details are lost in dark areas. Is there some fix for this or is the screen just too bad on the Tab S2? I know the Tab S3 has a HDR screen, and the S2 not. I dont have any HDR screens actually, but I can put color range to "full" on my desktop PC, which will en-light colors a bit, making details more pop out in dark areas (though black isnt fully black anymore if so).
Any color profile other than basic is mostly unusable, too much saturation. Still dark areas lack lots of information. Is there no way to fix this? I tested this actually
https://phandroid.s3.amazonaws.com/wp-content/uploads/2016/03/Screenshot_20160321-154452-400x711.png
and it helps with the details in dark areas, but it also makes the black bars of movies in Netflix and video players not black anymore but gray.
So from what i can tell, it's only a stock rom problem. As the screen looks amazing running liniage (best screen in the house). But I've recently decided to go back to stock debloated, as I think its running a bit snappier than liniage 16 or 17.
Has anyone found a black level fix for stock yet? (preferably not a screen tint app)
Touch the left hand side of the screen when watching netlix and a brightness slider appears
Baxy57 said:
Touch the left hand side of the screen when watching netlix and a brightness slider appears
Click to expand...
Click to collapse
:cyclops: It's beyond what you're suggesting which is known :cyclops: but thanks for it
EDIT: I have now found a full workaround. First you need to enable Blue Light Filter. Then go to Settings > Accessibility > Visibility enhancements > Color adjustment > Personalized color, and choose all the colors in the correct order. If you do it correctly there won't be any change to the colors and Blue Light Filter will be "on", but actually not, which will override whatever Android is doing that's making the dark parts of movies way darker than they should be. So far I haven't found any cons of this workaround.
Original post:
Sorry to resurrect an old thread, but after trying to fix this problem for like half a day (lol) I think I found the best workaround so far. If you turn on Blue Light Filter and set its opacity to minimum, the filter will be barely noticable, but the brightness issue will be fixed.
One thing I noticed is that not all apps have this problem. For example VLC, Youtube do have it (you can even see the transition of colors and brightness for a second when exiting to desktop view). However Youtube Vanced doesn't have this issue, so I asssume the operating system does this dumb change of colors when it sees certain parameters in an app (maybe something in the manifest.json file?). It would be awesome if some more knowledgeable people could look into this issue, maybe they could find something about why YT Vanced has normal colors.

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