[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

Ting-Wei Lan <[email protected]> changed:

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

--- Comment #12 from Ting-Wei Lan <[email protected]> ---
I saw similar problems on FreeBSD 13.1-RELEASE-p5. The hardware is Intel
i5-650.

For the DRM part, it is the VT switch problem. If I don't switch VT after Xorg
is started, everything seems to be fine. However, if I switch to a different VT
and switch back, apps using OpenGL show these messages and use llvmpipe.

libGL error: failed to authenticate magic 1
libGL error: failed to load driver: i965

This issue has been reported: https://github.com/freebsd/drm-kmod/issues/175.
Downgrading to drm-54-kmod can fix the problem.

For the Mesa part, it is the modesetting driver problem. Mesa 21.3.8 works fine
with the modesetting driver, but Mesa 22.3.0 can't run GNOME Shell with the
modesetting driver. I can move the mouse and click things, but GNOME Shell
won't update the screen unless I switch to a different VT and switch back.

Using xf86-video-intel instead of the modesetting driver can fix the GNOME
Shell problem, but it seems to cause some apps to fail to update the screen.
For example, PCManX sometimes fail to completely update the screen when
scrolling with keyboard. I have to move the mouse or switch to a different
window in order to see the updated screen.

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