[Bug 267915] x11-wm/mutter: after graphics/mesa-* 21.3.8 -> 22.2.3 update OpenGL compositing fails on Intel Iris Pro

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267915

Harald Schmalzbauer <[email protected]> changed:

           What    |Removed                     |Added
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                 CC|                            |[email protected]

--- Comment #39 from Harald Schmalzbauer <[email protected]> ---
(In reply to Andre Albsmeier from comment #38)
> Unfortunately, the modesetting driver doesn't have this setting...

Just monkey see, monkey do report from my side,
with an excerpt of my etc/X11/xorg.conf.d/server.conf section I changed today:
# Setup for one X display, extended over 3 monitors
Section "Device"
        Identifier  "GT2-haswell"
        Driver      "modesetting"
        Option      "HotPlug"   "0"
        # Option DRI 3 enables the "iris" driver instead of "zink" fallback
        Option      "DRI"       "3" # ('zink' is GL over Vulkan and shows
errors
                                    #           authenticate magic 1
                                    #           failed to load driver: iris
                                    #   with xdriinfo(1)/[glxinfo -B]).
        Option "monitor-DP-1"   "Dell-30inch-center"
        Option "monitor-DP-2"   "Eizo-24inch-left"
        Option "monitor-HDMI-1" "Eizo-21portrait-right"
        BusID       "PCI:0:2:0"
EndSection

This is on stable/14 (1402504):
dmesg excerpt:
    drmn0: [drm] Finished loading DMC firmware i915/kbl_dmc_ver1_04.bin (v1.4)
    [drm] Initialized i915 1.6.0 20201103 for drmn0 on minor 0
    VT: Replacing driver "efifb" with new "drmfb".
Relevant packages:
drm-61-kmod-6.1.128.1402000_2  DRM drivers modules
libdrm-2.4.123,1               Direct Rendering Manager library and headers
gpu-firmware-intel-kmod-kabylake-20230625.1402000 Firmware modules for kabylake
Intel GPUs

At least today, modesetting(4) seems to have the DRI Option.
Performance wise there's not too much difference, glxgears(1) shows now ~6300
FPS instead of ~5400 FPS with 'zink'.

Real benefit: These errors, which were continuously recorded  in
~/.xsession-errors, vanished:
    authenticate magic 1
    failed to load driver: iris

Now invoking xdriinfo(1) shows (without errors):
xdriinfo                         
Screen 0: iris

Previously, "Screen 0:" read 'zink' and the "authenticate magic 1"/"failed to
load driver: iris" errors occurred.

I only understand a fraction of the whole mesa/dri mesh...
Just wanted to report that I have _no issues_ with adding
'Option      "DRI"       "3"'
to my modesetting(4) based config on my workstation
(CPU: Intel(R) Xeon(R) CPU E3-1275 v6 @ 3.80GHz)

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