No /dev/dri on a Celeron N5105 (Jasper Lake) based build for Plex hardware acceleration

[spengbab]

Hello,

I've searched around a fair amount, and I think I understand what's going on/what I'm waiting for, but I'd like to ask explicitly to make sure I'm not munging things!

Per the title, I've built a Celeron N5105 based box to run TrueNAS Core. There wasn't too much thought put into Core vs Scale, so, assuming I could migrate my datasets, I'd be willing to switch if it meant I could get hardware acceleration for Plex.

I followed https://github.com/danb35/freenas-iocage-plex to get a jail setup with Plex, which is working well. I went on to look into hardware acceleration on my TrueNAS Core 13.1u4 box:

Code:

root@truenas[~]# uname -a
FreeBSD truenas.local 13.1-RELEASE-p7 FreeBSD 13.1-RELEASE-p7 n245418-79e75956dbb TRUENAS amd64
root@truenas[~]#
root@truenas[~]# lspci|grep -i intel|grep -i graphics
00:02.0 VGA compatible controller: Intel Corporation JasperLake [UHD Graphics] (rev 01)
root@truenas[~]#

...but I failed at this hurdle:

Code:

root@truenas[~]# ls -l /dev/dri
ls: /dev/dri: No such file or directory
root@truenas[~]#

As I understand it, with no `/dev/dri`, there's no chance of getting hardware acceleration working? Via https://github.com/kern2011/Freenas-Quicksync I landed on https://wiki.freebsd.org/Graphics/Intel-GPU-Matrix which says:

On FreeBSD 13, using drm-kmod, support is the same as on Linux 5.4
On FreeBSD 13, using drm-devel-kmod, support is the same as on Linux 5.4. This includes support for Intel Core gen 12.

...however, that page was last updated 2020-12-21T14:43:54+0000. Looking at https://github.com/freebsd/drm-kmod/releases, suggests that 5.4 is probably still accurate - the last release says:

Update 5.4-lts to match Linux kernel v5.4.144

Do I have to wait for https://github.com/Intel-Media-SDK/...pport-in-Linux-Kernels#lts-and-latest-kernels to show a tick in the box for EHL, JSL, DG1, ADL-S and then wait for it to come through drm-kmod/drm-devel-kmod and then make it into a TrueNAS Core release?

Sorry if I've gone completely off on the wrong path, I've been on a journey trying to understand what's going on and would appreciate a second pair of eyes!

Many thanks

 

[JohnDigital]

So this is what the basic instructions are and does work. Ive done it. Also works for any other jails that you might want to use HW accel


@@@ INTEL GPU OFFLOAD NOTES @@@

If you have a supported Intel GPU, you can leverage hardware
accellerated encoding/decoding in Plex Media Server on FreeBSD 12.0+.

The requirements are as follows:

* Install multimedia/drm-kmod: e.g., pkg install drm-fbsd12.0-kmod

* Enable loading of kernel module on boot: sysrc kld_list+="drm"
** If Plex will run in a jail, you must load the module outside the jail!

* Load the kernel module now: kldload drm

* Install the supporting Intel VA support library for your GPU
** multimedia/libva-intel-driver: [LEGACY] Intel GMA 4500 or newer
** multimedia/libva-intel-media-driver: Intel HD 5000 (Gen8) or newer
*** This must be installed beside Plex. e.g., in the jail with Plex

* Add plex user to the video group: pw groupmod -n video -m plex

* For jails, make a devfs ruleset to expose /dev/dri/* devices.

e.g., /dev/devfs.rules on the host:

[plex_drm=10]
add include $devfsrules_hide_all
add include $devfsrules_unhide_basic
add include $devfsrules_unhide_login
add include $devfsrules_jail
add path 'dri*' unhide
add path 'dri/*' unhide
add path 'drm*' unhide
add path 'drm/*' unhide

* Enable the devfs ruleset for your jail. e.g., devfs_ruleset=10 in your
/etc/jail.conf or for iocage, iocage set devfs_ruleset="10"

Please refer to documentation for all other FreeBSD jail management
utilities.

@@@ INTEL GPU OFFLOAD NOTES @@@

 

[JohnDigital]

Have a look at this post. I think this is what i did specifically. The other instructions are what's displayed following the PMS install.