As you did, I tried many things but it always crash.
The only things I didn’t try:
I really want to test point 2, because if I have HW transcoding with Intel’s ffmpeg and no crash, maybe it can be embedded in Plex package and solves our issues.
NOTE: After I finish my infrastructure upgrade (Network-> 10GbE, NAS to 8x12TB), I might be able to spin a VM for some unofficial support but that would be the limit of what I could do.
Add +1 looking for a resolution to hw Transcoding with NUC11TNHv50L. I’ve tried 20.04, 20.10 all with a slew of kernels from 5.8 to 5.12 at each stop. Dave green and black artifacts when Transcoding before the crash. I did install the i915 driver myself hoping that would help things along but no change in results.
ok I can’t speak to the difference between the NUC chip and the i5-11500 I have installed.
I have noticed a massive improvement in stability between my old set up on i7-7700k (IHD 630) vs the IHD750 in the i5-11500.
The steps with the [optional] token are included for completeness, but may not apply to your configuration.
I always ALWAYS backup any file before I edit it; I recommend you do the same. Typos happen and it’s always good to be able to restore the backup file and start over… 
I’ve put three *** at the start of any step where I think you should back up the file before you edit it.
I also judiciously use clonezilla to back up the entire disk at milestone points and have noted that too.
Here are the steps at a high level:
sudo apt update; apt list --upgradable
sudo apt upgrade
sudo apt install avahi-daemon mdns-scan wpasupplicant nfs-common
sudo timedatectl set-timezone America/Vancouver
sudo mount --all -v
CLONEZILLA here - basic OS install complete
– here’s where the interesting bits are –
sudo su -
mkdir /tmp/kernel
cd /tmp/kernel
wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.11.13/amd64/linux-headers-5.11.13-051113-generic_5.11.13-051113.202104101231_amd64.deb
wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.11.13/amd64/linux-headers-5.11.13-051113_5.11.13-051113.202104101231_all.deb
wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.11.13/amd64/linux-image-unsigned-5.11.13-051113-generic_5.11.13-051113.202104101231_amd64.deb
wget https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.11.13/amd64/linux-modules-5.11.13-051113-generic_5.11.13-051113.202104101231_amd64.deb
install with dpkg command
sudo dpkg -i /tmp/kernel/*.deb
*** Set “GRUB_CMDLINE_LINUX_DEFAULT=“i915.force_probe=4c8a” to /etc/default/grub – this depends on what PCI ID is reported for your IHD
(comment out first line, duplicate and populate with the i915.force_probe string value as below:
How do I find out the value?
root@ubuntu02:~# lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Device 4c8a (rev 04)
Use the 4 character hex value reported… 4c8a in this case.
#GRUB_CMDLINE_LINUX_DEFAULT=""
# 2021-04-17 BLT; addition to find/activate i5-11500 iHD
# https://forums.plex.tv/t/4k-hdr-hevc-hw-transcoding-is-broken-on-i5-11600k-rocket-lake/707057
GRUB_CMDLINE_LINUX_DEFAULT="i915.force_probe=4c8a"
update grub config
sudo update-grub
*** Update /etc/environment - add LIBVA_DRIVER_NAME variable
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin"
# 2021-04-17 BLT; added to find/activate i5-11500 iHD
# https://forums.plex.tv/t/4k-hdr-hevc-hw-transcoding-is-broken-on-i5-11600k-rocket-lake/707057
LIBVA_DRIVER_NAME="iHD"
sudo su -
mkdir /tmp/intel
cd /tmp/intel
wget -qO - https://repositories.intel.com/graphics/intel-graphics.key | sudo apt-key add -
apt-add-repository 'deb https://repositories.intel.com/graphics/ubuntu focal main'
https://github.com/intel/compute-runtime/releases/download/21.15.19533/intel-gmmlib_20.4.1_amd64.deb
https://github.com/intel/intel-graphics-compiler/releases/download/igc-1.0.6812/intel-igc-core_1.0.6812_amd64.deb
https://github.com/intel/intel-graphics-compiler/releases/download/igc-1.0.6812/intel-igc-opencl_1.0.6812_amd64.deb
https://github.com/intel/compute-runtime/releases/download/21.15.19533/intel-opencl_21.15.19533_amd64.deb
https://github.com/intel/compute-runtime/releases/download/21.15.19533/intel-ocloc_21.15.19533_amd64.deb
https://github.com/intel/compute-runtime/releases/download/21.15.19533/intel-level-zero-gpu_1.1.19533_amd64.deb
https://github.com/intel/compute-runtime/releases/download/21.15.19533/ww15.sum
here’s what my sources look like right now:
root@ubuntu02:~# apt-add-repository --list
deb http://ca.archive.ubuntu.com/ubuntu groovy universe main multiverse restricted
deb http://ca.archive.ubuntu.com/ubuntu groovy-updates universe main multiverse restricted
deb http://ca.archive.ubuntu.com/ubuntu groovy-backports universe main multiverse restricted
deb http://ca.archive.ubuntu.com/ubuntu groovy-security universe main multiverse restricted
deb https://repositories.intel.com/graphics/ubuntu focal main
deb http://download.webmin.com/download/repository sarge contrib
sudo sha256sum -c ww15.sum
intel-gmmlib_20.4.1_amd64.deb: OK
intel-igc-core_1.0.6812_amd64.deb: OK
intel-igc-opencl_1.0.6812_amd64.deb: OK
intel-level-zero-gpu_1.1.19533_amd64.deb: OK
intel-ocloc_21.15.19533_amd64.deb: OK
intel-opencl_21.15.19533_amd64.deb: OK
install with dpkg command
sudo dpkg -i /tmp/intel/*.deb
get any updated packages (again)
sudo apt update; sudo apt upgrade
ok… some more missing bits…
sudo apt install intel-media-va-driver-non-free libmfx1 intel-level-zero-gpu level-zero libdrm-intel1 vainfo
reboot
sudo reboot 0
check the environment:
root@ubuntu02:~# vainfo
error: XDG_RUNTIME_DIR not set in the environment.
error: can't connect to X server!
libva info: VA-API version 1.10.0
libva info: User environment variable requested driver 'iHD'
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/iHD_drv_video.so
libva info: Found init function __vaDriverInit_1_10
libva info: va_openDriver() returns 0
vainfo: VA-API version: 1.10 (libva 2.10.0)
vainfo: Driver version: Intel iHD driver for Intel(R) Gen Graphics - 21.1.2 (67dbfde)
vainfo: Supported profile and entrypoints
VAProfileNone : VAEntrypointVideoProc
VAProfileNone : VAEntrypointStats
VAProfileMPEG2Simple : VAEntrypointVLD
VAProfileMPEG2Simple : VAEntrypointEncSlice
VAProfileMPEG2Main : VAEntrypointVLD
VAProfileMPEG2Main : VAEntrypointEncSlice
VAProfileH264Main : VAEntrypointVLD
VAProfileH264Main : VAEntrypointEncSlice
VAProfileH264Main : VAEntrypointFEI
VAProfileH264Main : VAEntrypointEncSliceLP
VAProfileH264High : VAEntrypointVLD
VAProfileH264High : VAEntrypointEncSlice
VAProfileH264High : VAEntrypointFEI
VAProfileH264High : VAEntrypointEncSliceLP
VAProfileVC1Simple : VAEntrypointVLD
VAProfileVC1Main : VAEntrypointVLD
VAProfileVC1Advanced : VAEntrypointVLD
VAProfileJPEGBaseline : VAEntrypointVLD
VAProfileJPEGBaseline : VAEntrypointEncPicture
VAProfileH264ConstrainedBaseline: VAEntrypointVLD
VAProfileH264ConstrainedBaseline: VAEntrypointEncSlice
VAProfileH264ConstrainedBaseline: VAEntrypointFEI
VAProfileH264ConstrainedBaseline: VAEntrypointEncSliceLP
VAProfileHEVCMain : VAEntrypointVLD
VAProfileHEVCMain : VAEntrypointEncSlice
VAProfileHEVCMain : VAEntrypointFEI
VAProfileHEVCMain : VAEntrypointEncSliceLP
VAProfileHEVCMain10 : VAEntrypointVLD
VAProfileHEVCMain10 : VAEntrypointEncSlice
VAProfileHEVCMain10 : VAEntrypointEncSliceLP
VAProfileVP9Profile0 : VAEntrypointVLD
VAProfileVP9Profile1 : VAEntrypointVLD
VAProfileVP9Profile2 : VAEntrypointVLD
VAProfileVP9Profile3 : VAEntrypointVLD
VAProfileHEVCMain12 : VAEntrypointVLD
VAProfileHEVCMain12 : VAEntrypointEncSlice
VAProfileHEVCMain422_10 : VAEntrypointVLD
VAProfileHEVCMain422_10 : VAEntrypointEncSlice
VAProfileHEVCMain422_12 : VAEntrypointVLD
VAProfileHEVCMain422_12 : VAEntrypointEncSlice
VAProfileHEVCMain444 : VAEntrypointVLD
VAProfileHEVCMain444 : VAEntrypointEncSliceLP
VAProfileHEVCMain444_10 : VAEntrypointVLD
VAProfileHEVCMain444_10 : VAEntrypointEncSliceLP
VAProfileHEVCMain444_12 : VAEntrypointVLD
VAProfileHEVCSccMain : VAEntrypointVLD
VAProfileHEVCSccMain : VAEntrypointEncSliceLP
VAProfileHEVCSccMain10 : VAEntrypointVLD
VAProfileHEVCSccMain10 : VAEntrypointEncSliceLP
VAProfileHEVCSccMain444 : VAEntrypointVLD
VAProfileHEVCSccMain444 : VAEntrypointEncSliceLP
VAProfileAV1Profile0 : VAEntrypointVLD
VAProfileHEVCSccMain444_10 : VAEntrypointVLD
VAProfileHEVCSccMain444_10 : VAEntrypointEncSliceLP
CLONEZILLA here - OS + kernel + video drivers complete
sudo dpkg -i plexmediaserver_1.22.0.4163-d8c4875dd_amd64.deb
Other actions that may be required…
Umask=0002 so the optimized version directories don’t negatively interact with the NFS file systems I’m using.)/var/lib/plexmediaserver
sudo su -
systemctl stop plexmediaserver
cd /var/lib/plexmediaserver
mv -v ./Library ./Library.yyyy-mm-dd_01.backup
tar xvzf ./PMS_Library_backup.tgz
CLONEZILLA here - OS + kernel + video drivers + Plex software + Plex configuration complete
sudo wget -q -O- http://www.webmin.com/jcameron-key.asc | sudo apt-key add
sudo echo deb http://download.webmin.com/download/repository sarge contrib |
sudo tee /etc/apt/sources.list.d/webmin.list
sudo apt update
sudo apt install webmin lm-sensors smartmontools
sudo sensors-detect
CLONEZILLA here - OS + kernel + video + PMS install/config + webmin admin console
So that’s about it… 20 easy steps. ha.
Let me know if you have questions… I’m not an expert, but I can expand on the steps I did and the output I got if it’s not clear.
This is an awesome set of instructions mate, thank you! 
… I’m also moving from an i7-7700 with the HD 630 and am super unhappy with the stability (at least on Windows). I’ll have multiple unexplained crashes a day and for some reason cannot seem to attain any kind of crash report. I was going to get myself a 10th Gen NUC instead.
Yeah 6th gen onward are supposed to have the needed Intel Quick Sync Video components (or it starts with 6th gen and gets to full support for HDR 10 in 7th gen).
I went from i7-6700 to i7-7700k hoping that would be enough to get to stability. My family outside my network constantly crashed current versions of plex transcoding 4K to 1080p on the i7-7700k too though.
I landed on the bleeding edge 11th gen chips because even the 10th gen are still 600-series IHD ~ didn’t seem like I was getting a lot more QSV technology moving from 7700 to 8, 9 or 10th generation.
That’s my understanding anyway. Lots of posts in the forums about issues with 10th gen chips too.
@RoadRacer12 pointed me to this Wikipedia entry on Intel QSV which has a lot of interesting detail that summarizes the various info you can get from Intel ARK product info
If you can hold off for a while ~ might be worth it. You’ll get more capability and more stability.
Good luck!
Thanks’ a lot for the steps. Also had the issue with intel repository. I thought it would work after some time but still not able to use it with the same error you had.
I ran into the same issue with the Intel repo as well.
Workaround on the intel repo worked for me:
apt-get install --print-uris
libdrm-intel1 vainfo
intel-opencl-icd
intel-level-zero-gpu level-zero
intel-media-va-driver-non-free libmfx1
| awk -F’ ‘/https/{print $2}’
| sed ‘s/+/%2B/g’
| xargs sudo wget -P /var/cache/apt/archives
&& sudo apt-get install
libdrm-intel1 vainfo
intel-opencl-icd
intel-level-zero-gpu level-zero
intel-media-va-driver-non-free libmfx1
Also happy to say that after following steps from [BLiTyvr] after 30 minutes playing with HW transcoding no crashes yet. running plex on ubuntu on esxi
So, is this issue now fixed?
I’ve been wanting to transition to an 11th gen NUC as my Plex server for some time now, it’s the first generation that finally supports 2.5Gbit Ethernet.
My current server is Ryzen+GeForce for transcoding, the NUC would consume a third the power.
But if it’s much more difficult than swapping the m.2 SSD and Intel remains sluggish with their gpu drivers I’ll hold of pulling the trigger for now.
Could someone please give me a definite response on this?
No it’s not fixed.
The topic derived to an Intel 11th gen desktop topic.
NUC11 uses a mobile CPU, different than desktop, and stills crashes, whatever you try.
Hardware accel can’t be used at all.
Thanks @geeooff
That’s a shame. I hope this will be resolved by the end of the year. At the latest when Intel’s dGPUs enter the market, one might expect…
Let me quote Intel:
[…] our support for Linux* is very limited on this platform since we have only tested and validated Windows 10*, see this URL for Operating System Compatibility reference information Supported Operating Systems for Intel® NUC Products
Also, keep in mind that we dont provide specific drivers for Linux, the drivers should be provided by the Linux distribution so I would recommend that you reach to the Ubuntu* community for support on this issue.
And here’s the Linux* Support for Intel® NUC page.
They only support officially NUC7 on Linux.
I don’t know how DELL managed to get Ubuntu support on its new XPS 13 (same CPU/iGPU as the NUC11):
Dell brings new Intel 11th gen Core processors to the XPS 13 Developer Edition | Ubuntu
Anyone with a DELL XPS 13 “9310” ?
What OS version and kernel are you running with your current setup 20.10, w/ 5.10? Thanks in advance.
Maybe a bit off-topic, but since this still isn’t officially supported – what’s the best alternative right now?
A little more to this ongoing issue, I was able to get HW transcoding to work on everything except content that uses the VC1 codec. That’s when I see the green flashes and pixelation as pictured in screen shots at the top of this thread. Everything else plays nice and Tautulli shows the HW transcoding (it does on the VC1 content just the picture issues) Hope this helps clear up any cloudiness surrounding the 11th gen chips.
@Kasper56 Can you confirm what system you have?
Is it a nuc? ((Edit, I see you have a nuc from an older post)
What os and kernel package?
Which Intel compute packages installed if any?
I’ve listed mine a few different times here already. Yes it works, sometimes even works without Atrifacts. But will always result in a crash. Sometimes needs 5 to 15 mins of testing.
Here my today’s experience:
enable_guc=2, UEFI boot w/ Secure Boot
I was monitoring with htop, intel_gpu_top and dmesg --follow commands.
On step 6 I was able to HW transcode.
As soon as I choose to “Convert to 1080p”, I had big warnings in dmesg (see dmesg_warning.txt (4.2 KB)), but everything looked fine and intel_gpu_top reported hardware video processing.
htop was reporting a neglectable load on several CPU cores (the audio transcoding I guess).
On step 7, after a few successful 1080p loops, I moved to 720p transcoding. Immediately I got error in dmesg (see dmesg_error.txt (2.8 KB)) and plex crashed.
intel_gpu_top never reported activity, and now nothing can be transcoded, the NUC has to reboot to regain HW transcoding capability.
For now, I’m able to get very little HW capability with “Use hardware acceleration when available” to ON (so just HW decoding), but “Use hardware-accelerated video encoding” is just not usable.
I’m not even thinking about HDR tone-mapping for now.
So I have 2 11th gen CPU’s, one is the Intel Nuc11 Pro i5 and a i5-11600K Desktop CPU.
The latest test for both have been using the Ubuntu 20.04 w/ kernel oem-20.04b which is 5.10.0-1021-oem.
Latest Plex BETA in a docker container.
beignet-opencl-icdocl-icd-libopencl1It still hit or miss, VC1 still causes artifacts and the NUC does lockup anywhere from 3 minutes to 20 minutes of transcoding. 
Thanks for the update.
Unfortunately that is the same as it has been for months now. The quality issues change depending on different factors I’ve not bothered to test further. It isn’t important currently.
I saw improvements when moving to 5.11 and 5.12 among other things but until the crashes are fixed it’s pointless. I managed maybe 8+ concurrent sessions at one point.
The test content also makes a difference to output quality, there are still many differences to content encoding other than baseline, main and high as well as multiple levels etc that give different results. I’d say even different encoders using the same settings would give you different results to some extent.
