HDR Tone Mapping with HW Transcoding not working for 12900K CPU on PMS Version 1.32.5.7210

[V3nom]

Server Version#: 1.32.5.7210
Player Version#: Browser 4.100.1 Android Player: 9.26.0.2526

HDR Tone mapping with HW Transcoding broken for the 12900K. I’m on Unraid 6.12.1 Linux kernel 6.1.34 and plex 1.32.5.7210 and if I try and play a 4K HEVC movie with Tone mapping enabled it wont Hardware transcode and will transcode using the CPU.

If I uncheck HDR Tone mapping then it HW transcodes fine.

The only solution that i have found was to roll back my Official PMS Docker container back to 1.32.1.6999-91e1e2e2c all later versions after this break the HDR Tone Mapping HW Transcode and the CPU gets hammered.

[ChuckPa]

Must be an issue with your Unraid VM.

The native installation is working as it should be

chuck@plexqa-av1:/var/lib/plexmediaserver/Library/Application Support/Plex Media Server$ dpkg -l | grep -i plexm
ii  plexmediaserver                            1.32.5.7210-77f7f99fa                    amd64        Plex organizes all of your personal media so you can easily access and enjoy it.
chuck@plexqa-av1:/var/lib/plexmediaserver/Library/Application Support/Plex Media Server$ cat /proc/cpuinfo | grep 'model name' | uniq
model name	: 13th Gen Intel(R) Core(TM) i5-13400
chuck@plexqa-av1:/var/lib/plexmediaserver/Library/Application Support/Plex Media Server$ 

[V3nom]

Hi @ChuckPa,
I dont think its Unraid because as soon as i rolled back my official Plex Docker container to version 1.32.1.6999-91e1e2e2c it all started working again as normal.

Also, im using 12th Gen Alder Lake and i see you are using a 13th Gen chip, perhaps the 13th Gen is working fine.

Would you like logs or something from my side?

[V3nom]

Essentially what im seeing is that anything not HEVC will hw transcode but as soon as there is a HEVC file then it does not hw transcode and the only way to get around that is to disable Tone mapping.
Rolling back to the version mentioned above resolves all these issues.

[ChuckPa]

Damn.

I have an AlderLake in our lab and I’m not having any trouble with 1.32.5.

I did this earlier today.

[V3nom]

@ChuckPa I can roll back to 1.32.5 Latest version and provide logs if that helps.
Its just very strange that version 1.32.1.6999-91e1e2e2c works perfectly but any other later versions wont hw transcode HEVC files.

[V3nom]

I just rolled back to 1.32.4.7195 and tried a transcode.

[ChuckPa]

I don’t know what the difference is yet.

My only test point is the QA machine on Ubuntu 22.04 and it works flawlessly.

1.32.4 had issues – that’s known… I know of several issues with ApolloLake CPUs

I have my little unraid i3-7300 but that doesn’t count because it’s a KabyLake.

[V3nom]

All good ChuckPa thank you very much for looking into this for us.

I did another test with Plex version 1.32.5.7210 with the following result.

[V3nom]

Yeah i have another Unraid box and its using an i9600K Coffee Lake and that works without any issue on Plex version 1.32.5.7210. That Unraid Box is the same Unraid Version and Linux version as the 12900K thats having issues.

So i dont think its Unraid or the Linux kernel version thats causing the issue.

[ChuckPa]

@V3nom

So i dont think its Unraid or the Linux kernel version.

There is wiggle room in your statement…

It’s not plex if I can do this (source of the screenshots above):

chuck@plexqa-av1:/var/lib/plexmediaserver/Library/Application Support/Plex Media Server$ dpkg -l | grep -i plexm
ii  plexmediaserver                            1.32.5.7210-77f7f99fa                    amd64        Plex organizes all of your personal media so you can easily access and enjoy it.
chuck@plexqa-av1:/var/lib/plexmediaserver/Library/Application Support/Plex Media Server$ cat /proc/cpuinfo | grep 'model name' | uniq
model name	: 13th Gen Intel(R) Core(TM) i5-13400
chuck@plexqa-av1:/var/lib/plexmediaserver/Library/Application Support/Plex Media Server$ 

I’m starting my unraid box now and will see what I get

[V3nom]

Fair point
Thanks for testing this. Im interested to hear what you find out on your Unraid box.

Just for completeness i did another test with Plex version 1.32.5.7210 on the Alder Lake CPU but this time i disabled “HDR Tone Mapping” and only then the hw transcoding works.

[ChuckPa]

Check your transcoder setting??

Mine got reset.

[ChuckPa]

all good here. You got gremlins somewhere. Did you feed it after midnight ??

[V3nom]

Nope, mine looks good.

[ChuckPa]

how’d you force update the container?

(Where’s dpkg hidden)

This way??

[V3nom]

I used the plexpass image
Does the plexpass image give the same container as yours? i can try and specify the container like you did and see if that makes a difference.

[ChuckPa]

The words you don’t want to hear …

“Works for me!”

I’m on the 5.19 kernel.

root@BabyNUC:~# uname -a
Linux BabyNUC 5.19.17-Unraid #2 SMP PREEMPT_DYNAMIC Wed Nov 2 11:54:15 PDT 2022 x86_64 Intel(R) Core(TM) i3-7100U CPU @ 2.40GHz GenuineIntel GNU/Linux
root@BabyNUC:~# 

FWIW: Our QA AlderLake machine is also 5.19 kernel

chuck@plexqa-av1:~$ uname -a
Linux plexqa-av1 5.19.0-45-generic #46-Ubuntu SMP PREEMPT_DYNAMIC Wed Jun 7 09:08:58 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
chuck@plexqa-av1:~$ 

[V3nom]

haha noooo

ah well. ill just have to downgrade back to 1.32.1.6999-91e1e2e2c then.
I know at least of another person having the same issue as me. Posted on the Discord support and reverting back to 1.32.1.6999-91e1e2e2c also worked for him.

I dont want to be a pain but are you able to upgrade your Kernel? when i was on 5.19 kernel it was working perfectly so perhaps a compatibility thing?

[ChuckPa]

Are you running a 6.x kernel and on the floor ?

I am more inclined to think it’s compatibility with 6.x kernel.
(Intel Media Driver)

I can’t upgrade the master QA machine on a whim