[Bug 297135] graphics/drm-66-kmod: Fails with integrated AMD graphics

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D297135

--- Comment #3 from Yuri Victorovich <[email protected]> ---
Here is the workaround that works for me. Add this file, assuming that your
Xorg configuration is in /usr/local/etc/X11/xorg.conf.d/:

$ cat /usr/local/etc/X11/xorg.conf.d/20-modesetting.conf
Section "Device"
    Identifier "Zen5-iGPU"
    Driver     "modesetting"
    Option     "AccelMethod" "glamor"
    Option     "DRI" "3"
EndSection
Section "Module"
    Load "dri3"
    Load "glx"
EndSection


With the above config file the "Fence fallback timer expired on ring ..."
messages are still printed but very rarely and they don't seemingly affect
system responsiveness.

The original problem caused the Xorg based graphics screen to become incred=
ibly
slow.

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