S20 HDMI screen mirroring (not dex) via usb C adaptor - Samsung Galaxy S20 / S20+ / S20 Ultra Accessories

Hey, I got a generic USB C - HDMI dongle and when i plug it into the S20 and a TV (or pc monitor) the Samsung's Dex screen appears and works well but if I go into phone's Settings, HDMI mode and choose "Screen mirroring" instead of "Samsung DeX" then the tv shows "no signal".
I'm only interested in the screen mirroring part which doesn't seem to work (there's a toast on the phone saying "Connected to external display" but the tv/monitor at the other end of the hdmi cable says "no signal"). This same setup (adaptor) works on a laptop via USB C.
Anyone got this to work somehow? I'm trying on 60Hz and 1080p.
[Samsung galaxy s20 exynos on Android 11 & december security patch.]

Don't know if it can help, but when I have Dex displayed on TV through USB-C to HDMI cable, I shut it down from its start menu and the display switch to a screen replica. I'm on S20 Exynos Android 10 but you could have a try on 11.
As far as I understand Samsung S20 screen mirroring is the "Smart View" and is a wireless function .

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No mirroring yet. Theater mode pops up as an option when plugging in a HDMI cable. with a long enough cable it works as a great remote control.
2. Does the 'Theater' mode play video that was not created on the device?
Yes, but you should check the supported codec list on motorolas website, I have had some problems with some obscure audio codecs.
3. Does the Android window in webtop mode let you scale the app or is it a fixed size?
Yes its scalable, but there is borders on the screen that prevent it from stretching to the entire screen
4. Has anyone tried using storage(such as a keydrive) or wireless keyboard/mouse(2.4GHz not bluetooth) in the usb ports on the HD dock or the Laptop Dock?
FAT32 usb drives seem to work, haven't gotten to try a usb 2.0 hdd. Wireless 2.4GHZ peripherals work fine.
so HDMI mirroring is out i know that but still havent been able to test any of the rest of this in my trip to AT&T, as someone had locked the fingerprint reader to their print lol

Can i "Screen Mirroring" from galaxy s3 to sony smart tv

I have Sony smart TV that already hav Screen mirroring function & Galaxy S3(running on WanamLite XXUFME7 V7.1 Android 4.2.2 Aroma & Clean & Smooth)
Can i "Screen Mirroring" from galaxy s3 to sony smart tv. I've use Screen Mirrroring from s3 Settings.but it told me "unable to start screen mirroring because of a hardware issue"
what 's problem here???
//srry for my bad English
If you are looking for wireless mirroring then you will need one of these.
AllShare Cast Wireless Hub
Otherwise, you can use a MHL adapter for wired mirroring.
MHL Adpater
t3chg33k said:
If you are looking for wireless mirroring then you will need one of these.
AllShare Cast Wireless Hub
Otherwise, you can use a MHL adapter for wired mirroring.
MHL Adpater
Click to expand...
Click to collapse
no.My TV is Sony smart TV 2013.that already have MHL & wireless Mirroring function.so i think i don't have to buy anything above
http://www.sony.co.th/product/kdl-42w674a?site=hp_en_TH_i
fantasylovevn said:
no.My TV is Sony smart TV 2013.that already have MHL & wireless Mirroring function.so i think i don't have to buy anything above
http://www.sony.co.th/product/kdl-42w674a?site=hp_en_TH_i
Click to expand...
Click to collapse
Theoretically then it should work unless there is some incompatibility. Don't have personal experience of the same, so I suppose you will have to wait for a response from someone who has tried out screen mirroring using the S3.
Same problem here
Hi, maybe it's too late for an useful answer, but... the "Screen Mirroring" works on Sony TVs, and without the all-share cast dongle!
I have a Sony W6 (2013), connected via WiFi.
With stock rom 4.3 just connect the S3 to the same network, turn on screen mirroring on the phone and the Screen Mirroring should star automatically!
But screen mirroring doesn't work with a modded rom, in that case will appear the message "unable to start screen mirroring because of a hardware issue". Maybe the flash counter must be "0"... I don't know if there's a way to use this functionality with a modded rom.

[Q] mhl connection problem

i've got a sony led tv and a samsung galaxy tab 3 and when i connect it to the tv they both understand that mhl is connected but nothing shows up on tv
the tablet gives a toast notifying that hdmi is connected and the tv writes "player 1" on top and "no signal" on the right bottom corner
is my cable faulty or should i do something for the image to show up?

MHL general question

Hi all, it's first time I try an mhl cable with my galaxy s2.
But the problem is:
I have connected smartphone via mhl cable and an hdmi to vga adapter to my vga monitor.
It's all ok, image appear on the vga screen.
But:
Time ago I phisically turned my vga monitor to stand vertically, and my hope was to see my smartphone in portrait mode in full screen external monitor, but mhl auto adjust output when try to change from landscape to portrait on the smartphone.
Any way to disable this auto-adjustment?
Sorry for bad english.

Application conflict with HDMI Connection

Just bought a used Samsung Tab S7 , factory reset it already
Was planning to use it to stream games,
Bought a HDMI Port with additional USB ports
And A Third Part Gaming Extender to Connect Mouse and Keyboard
The Third Party Gaming Extender worked fine on the USB port and communicated well with the application
The WASD movement was smooth, Mouse aims fine
When I plugged in hdmi (connected to Elgato60 a capture card that is connected to my pc)
Into my HDMI Port HowEver
The Third Party Gaming Extender still recognizes my mouse and keyboard
But the software had a hard time translating it into the game
WASD movement was butchered,
Mouse aim went reverse
Though HDMI signal is successful in displaying Tab S7 screen on my computer
My Question is what did the HDMI connection do to screw up this third party gaming software?
Is there anything I can turn off regarding HDMI side effects on other applications on my Samsung Tab S7?
Will buying a HDMI splitter fix this problem?
Thank you For reading this long post,
I really am desperate right now
i also got this and tried many thing but nth. HDMI will change tab s7 touch screen ratio and reverse. if you use nor mal mouse and keyboard no issue. but using game extender got this issue. you can't do anything on tab s7. Game extender may able to solve this issue.

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