[Kernel] [H990] D.O.T.S. v1.4 [01/04] - LG V20 ROMs, Kernels, Recoveries, & Other Developm

This kernel is the result of a common work with @Leicxan. It can only be used on H990 and was successfully on single sim AND double sim variants. D.O.T.S. kernel is :
- Dirty Santa rooted
- Optimized
- Tweaked
- Stock based
Caution
Nor @Leicxan nor I are responsible for any damage caused to your phone. Any of the action you'll make to flash a kernel theorically voids your warranty. If don't accept any risk, then keep your stock phone
Content
- Based on v10g official LGE sources
- Compiled with UBERTC 7.x Linaro 7.2.1 (since V1.4)
- Dirty Santa root as implemented by @emdroidle
- CPU Governors : performance, powersave, userspace, ondemand, conservative, interactive, darkness, nightmare, zzmove, blu_active, elementalx, chill, dancedance. Default is interactive.
- I/O Schedulers : noop, deadline, cfq, fiops, sio, bfq, zen, maple. Default is zen.
- TCP congestion protocols : htcp, cubic, bic, reno, westwood. Default is westwood.
- Adreno idler
- Adrenoboost
- Exfat Support
- KCAL
- RCTD removed
- Wakelocks management
- Various small optimizations and tweaks
History
V1.0 [11/10] : original version
V1.1 [11/22] : CPU frequency hard limit (for battery drain improvement) and various minor fixes
V1.2 [11/27] : CPU frequency fix, exfat from samsung's open source module, LGE adaptive readahead
V1.3 [12/11] : Upstream Kernel to 3.18.86 thanks to @thirdzcee. Disabled LGE's rctd, ccmd and triton. Disabled some debug configuration. Note : Windows Defender can detect the archive as a Fuerboos trojan, this is a false positive.
V1.4 [01/04] : Fix for kernel crash when using pptp vpn. Upstream Kernel to 3.18.90.
Installation instructions
Follow the instructions provided by @emdroidle here : https://forum.xda-developers.com/v20/development/dirtysanta-h990-t3624296
At step 16, instead of typing fastboot reboot, just unplug the usb cable, remove battery, wait 5 sec, put the battery back and reboot the phone. This should limit the risk of static screen at reboot.
Once the kernel installed, update your phone to the latest KDZ for your region using KDZ Writer : https://forum.xda-developers.com/v20/development/tool-kdz-writer-t3649818
Known bugs
Some users reported issues with SD cards formated with exFat. This is not a general issue. The root cause is not clear (linked to the way the SD card is formated ?).
How to report a problem
It is very important to provide as many details as possible when you report a problem. It means providing :
- the model of your phone
- the version of the kernel and of the KDZ you updated to
- a precise description of the problem and of the circumstances
- logs (logcat & dmesg) : https://forum.xda-developers.com/showthread.php?t=2185929
Q&A
Before asking please :
- read the posts in this thread. The "Search Thread" box is your friend.
- have a look at @xdav20's H990DS Info Bank thread which is full of usefull information : https://forum.xda-developers.com/v20/how-to/h990ds-info-bank-t3703736"
Thanks
@emdroidle for his implementation of Bad Santa on H990
@USA-RedDragon for his werewolf kernel that was inspiring
Sources
https://github.com/guaibao1101/h990x-msm-3.18/tree/DOTS_v1.3
Downloads

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Can we flash this over an existing kernel via TWRP if we have already rooted?

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p7810456 said:
Can we flash this over an existing kernel via TWRP if we have already rooted?
Click to expand...
Click to collapse
Normally yes.. But if there is a problem, you'll have to restart all over, so make a backup of your phone, just in case..

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It would be nice if this can be crossed over to H918.

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First of all, just want to say thank you to @jahlex and @Leicxan for bringing the long awaited kernel with literally everything I could ask for to our devices.
Upon first install by flashing in TWRP, wiping dalvik/cache and rebooting, my phone goes to the LG screen, then black screens and I get a kernel crash screen that I've taken a photo of here
Any ideas what's causing it? My system version is in my signature. I'm really keen to get this working! For now I've restored my TWRP backup I did before flashing, back to 0.2.3b
Update: Even after the TWRP restore I was still getting the same problem. Immediately I thought it might be a Magisk problem as that's the only other thing I updated before rebooting. It appears I was correct. I used KDZWriter to re-flash the boot & system partitions of my phone (since Magisk modifies the boot image) and it immediately booted okay with my TWRP backup. Booted back into recovery, flashed the kernel as well as a previous Magisk version (14.0 not 14.2) and my other /system apps & mods, wiped cache, rebooted and sat on the LG screen for a while. Then booted into the OS okay. Glad it worked out and I'm keen to see how this kernel goes.
On a sidenote, do you have any plans to bring it to a more up to date version of the linux base kernel?

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jahlex said:
Normally yes.. But if there is a problem, you'll have to restart all over, so make a backup of your phone, just in case..
Click to expand...
Click to collapse
This worked for me! Thanks a lot!

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iDefalt said:
First of all, just want to say thank you to @jahlex and @Leicxan for bringing the long awaited kernel with literally everything I could ask for to our devices.
Upon first install by flashing in TWRP, wiping dalvik/cache and rebooting, my phone goes to the LG screen, then black screens and I get a kernel crash screen that I've taken a photo of here
Any ideas what's causing it? My system version is in my signature. I'm really keen to get this working! For now I've restored my TWRP backup I did before flashing, back to 0.2.3b
Update: Even after the TWRP restore I was still getting the same problem. Immediately I thought it might be a Magisk problem as that's the only other thing I updated before rebooting. It appears I was correct. I used KDZWriter to re-flash the boot & system partitions of my phone (since Magisk modifies the boot image) and it immediately booted okay with my TWRP backup. Booted back into recovery, flashed the kernel as well as a previous Magisk version (14.0 not 14.2) and my other /system apps & mods, wiped cache, rebooted and sat on the LG screen for a while. Then booted into the OS okay. Glad it worked out and I'm keen to see how this kernel goes.
On a sidenote, do you have any plans to bring it to a more up to date version of the linux base kernel?
Click to expand...
Click to collapse
Magisk 14.2 and 14.3 are beta version, I tried magisk 14.3 but my h990n always boot into bootloader interface..
So just stay with magisk 14, it doesn't have any issue.
For the Linux version, it will take tons of time to do this even we just upstream our kernel (from 3.18.31 to 3.18.79)
Sent from my OnePlus3T using XDA Labs

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Leicxan said:
Magisk 14.2 and 14.3 are beta version, I tried magisk 14.3 but my h990n always boot into bootloader interface..
So just stay with magisk 14, it doesn't have any issue.
For the Linux version, it will take tons of time to do this even we just upstream our kernel (from 3.18.31 to 3.18.79)
Click to expand...
Click to collapse
Yeah I don't know why 14.0 prompted me to update to a beta version. I know 14.3 added something to do with supporting LG devices better, maybe that broke something. Otherwise I'm quite happy with how things are going ?
And yeah I'm somewhat familiar with how long kernel related things can take, it was more of a question if anything.

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I've just installed it now, it works perfectly for now much more reactive i've impression Thank you!!

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storm68 said:
It would be nice if this can be crossed over to H918.
Click to expand...
Click to collapse
That would be awesome!!!!!!

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A million thanka for this for jahlex and lexican
Is the kernel in the downloads in the OP is the same version as this one : DirtySanta-h990-1.2-u721-v10g that was posted back in rooting thread
Or is it newer ?

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storm68 said:
It would be nice if this can be crossed over to H918.
Click to expand...
Click to collapse
nymikey said:
That would be awesome!!!!!!
Click to expand...
Click to collapse
We only deal with H990 here guys. Thanks.
shouk_1987 said:
A million thanka for this for jahlex and lexican
Is the kernel in the downloads in the OP is the same version as this one : DirtySanta-h990-1.2-u721-v10g that was posted back in rooting thread
Or is it newer ?
Click to expand...
Click to collapse
This is major evolution of this kernel. DirtySanta-h990-1.2-u721-v10g was basically the stock v10g kernel with Dirty Santa root.

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Before all, thank you so much guys, that's a great work
For some opinions i have many friends that buy h990ds last year and me too, we concluded if tha kernel was more optimized battery side was more effective than performances, and will be great that CPU and GPU clocks and voltages will be more unlocked if you can do that , thank you again.

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great kernel thank you @jahlex :good: and @Leicxan :good: it works perfectly

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zinou213 said:
if tha kernel was more optimized battery side was more effective than performances, and will be great that CPU and GPU clocks and voltages will be more unlocked if you can do that , thank you again.
Click to expand...
Click to collapse
They've already enabled some overcooked frequencies with this, as seen in their Github commits. If it's battery you're looking for, install the AKT Profiles from the thread, and then choose a balanced or battery saving profile. Since installing those and this kernel, I'm regularly seeing 5-7 hours of screen time.
On a side note @jahlex or @Leicxan if you're looking for a beta tester, feedback, or Guinea pig to help out (that isn't actually building the kernel, that's above my ability to simply modify individual files) I'd love to help wherever possible
Been doing the whole TWRP/Flashing/Kernel/ROM thing since I got my G3 way back in the day.

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zinou213 said:
Before all, thank you so much guys, that's a great work
For some opinions i have many friends that buy h990ds last year and me too, we concluded if tha kernel was more optimized battery side was more effective than performances, and will be great that CPU and GPU clocks and voltages will be more unlocked if you can do that , thank you again.
Click to expand...
Click to collapse
As @iDefalt said, we already enabled higher max frequency / voltage for both CPU & GPU. We won't go higher because the result would be high risks of unstability and overheating. If you want performance and do not care about battery life, simply switch to performance governor for both CPU & GPU. We use interactive CPU governor by default because it is a good choice considering balance performance / battery life (nightmare & darkness are good choices too). You have plenty of apps to do that, example : https://play.google.com/store/apps/details?id=com.grarak.kerneladiutor.
iDefalt said:
They've already enabled some overcooked frequencies with this, as seen in their Github commits. If it's battery you're looking for, install the AKT Profiles from the thread, and then choose a balanced or battery saving profile. Since installing those and this kernel, I'm regularly seeing 5-7 hours of screen time.
On a side note @jahlex or @Leicxan if you're looking for a beta tester, feedback, or Guinea pig to help out (that isn't actually building the kernel, that's above my ability to simply modify individual files) I'd love to help wherever possible
Been doing the whole TWRP/Flashing/Kernel/ROM thing since I got my G3 way back in the day.
Click to expand...
Click to collapse
OK buddy. We'll remember.

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Thanks!!! And with KCAL, it's perfect! :victory:

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Huge thanks guys! Everything works great, even video recording. Great work!!!

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@jahlex @Leicxan
Thank you for the release. I will report back any noteworthy issues.
Please forgive me if the following comment may deemed as a thread hijacking. I would be happy to remove it on your request.
I have just started a new thread in time for H990DS users and others, with useful information and tutorials that would potentially answer the most commonly asked questions or the issues sooner or later you would run into.

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Kcal is so nice to finally have, thank you c: