[Bug 266875] multimedia/libva-utils: VAAPI X11 driver only works as root

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266875

            Bug ID: 266875
           Summary: multimedia/libva-utils: VAAPI X11 driver only works as
                    root
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: jbeich@FreeBSD.org
          Reporter: edenist-fbz@edenist.net
             Flags: maintainer-feedback?(jbeich@FreeBSD.org)
          Assignee: jbeich@FreeBSD.org

FreeBSD: 12.3-STABLE FreeBSD 12.3-STABLE stable/12-3a9e60169ee GENERIC  amd64
libva-utils: libva-utils-2.15.0  (built via poudriere)

Hardware: 
- Thinkpad X1 [1st gen]
- i5-3330u
- HD4000 GPU

I've had it installed and running on this machine since 10.3 or so without
issue, but I recently noticed VAAPI wasn't being used with mpv anymore. Up
until somewhat recently, VAAPI was working as a non root user with the x11
driver.

Investigating with vainfo has me completely puzzled what has gone wrong.

* If I run vainfo --display x11 it fails, but sudo vainfo --display x11 works
fine, which suggests a permissions issue.
* I am a member of the video group and have access to GPU hardware.
* vainfo --display drm works as non-root user, so there appears to be something
up with the x11 driver [which just so happens to be what mpv uses for its
optimal vaapi implementation].

Here are my console outputs:

~$ vainfo --display x11
error: XDG_RUNTIME_DIR is invalid or not set in the environment.
libva info: VA-API version 1.16.0
libva info: Trying to open /usr/local/lib/dri/iHD_drv_video.so
libva info: va_openDriver() returns -1
libva info: Trying to open /usr/local/lib/dri/i965_drv_video.so
libva info: Found init function __vaDriverInit_1_16
get chip id failed: -1 [13]
param: 4, val: 0
libva error: /usr/local/lib/dri/i965_drv_video.so init failed
libva info: va_openDriver() returns -1
vaInitialize failed with error code -1 (unknown libva error),exit


~$ sudo vainfo --display x11
error: XDG_RUNTIME_DIR is invalid or not set in the environment.
libva info: VA-API version 1.16.0
libva info: Trying to open /usr/local/lib/dri/iHD_drv_video.so
libva info: va_openDriver() returns -1
libva info: Trying to open /usr/local/lib/dri/i965_drv_video.so
libva info: Found init function __vaDriverInit_1_16
libva info: va_openDriver() returns 0
vainfo: VA-API version: 1.16 (libva 2.15.0)
vainfo: Driver version: Intel i965 driver for Intel(R) Ivybridge Mobile - 2.4.1
vainfo: Supported profile and entrypoints
      VAProfileMPEG2Simple            :    VAEntrypointVLD
      VAProfileMPEG2Simple            :    VAEntrypointEncSlice
      VAProfileMPEG2Main              :    VAEntrypointVLD
      VAProfileMPEG2Main              :    VAEntrypointEncSlice
      VAProfileH264ConstrainedBaseline:    VAEntrypointVLD
      VAProfileH264ConstrainedBaseline:    VAEntrypointEncSlice
      VAProfileH264Main               :    VAEntrypointVLD
      VAProfileH264Main               :    VAEntrypointEncSlice
      VAProfileH264High               :    VAEntrypointVLD
      VAProfileH264High               :    VAEntrypointEncSlice
      VAProfileH264StereoHigh         :    VAEntrypointVLD
      VAProfileVC1Simple              :    VAEntrypointVLD
      VAProfileVC1Main                :    VAEntrypointVLD
      VAProfileVC1Advanced            :    VAEntrypointVLD
      VAProfileNone                   :    VAEntrypointVideoProc
      VAProfileJPEGBaseline           :    VAEntrypointVLD


~$ vainfo --display drm
libva info: VA-API version 1.16.0
libva info: Trying to open /usr/local/lib/dri/iHD_drv_video.so
libva info: va_openDriver() returns -1
libva info: Trying to open /usr/local/lib/dri/i965_drv_video.so
libva info: Found init function __vaDriverInit_1_16
libva info: va_openDriver() returns 0
vainfo: VA-API version: 1.16 (libva 2.15.0)
vainfo: Driver version: Intel i965 driver for Intel(R) Ivybridge Mobile - 2.4.1
vainfo: Supported profile and entrypoints
      VAProfileMPEG2Simple            :    VAEntrypointVLD
      VAProfileMPEG2Simple            :    VAEntrypointEncSlice
      VAProfileMPEG2Main              :    VAEntrypointVLD
      VAProfileMPEG2Main              :    VAEntrypointEncSlice
      VAProfileH264ConstrainedBaseline:    VAEntrypointVLD
      VAProfileH264ConstrainedBaseline:    VAEntrypointEncSlice
      VAProfileH264Main               :    VAEntrypointVLD
      VAProfileH264Main               :    VAEntrypointEncSlice
      VAProfileH264High               :    VAEntrypointVLD
      VAProfileH264High               :    VAEntrypointEncSlice
      VAProfileH264StereoHigh         :    VAEntrypointVLD
      VAProfileVC1Simple              :    VAEntrypointVLD
      VAProfileVC1Main                :    VAEntrypointVLD
      VAProfileVC1Advanced            :    VAEntrypointVLD
      VAProfileNone                   :    VAEntrypointVideoProc
      VAProfileJPEGBaseline           :    VAEntrypointVLD

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