[Bug 93147] [regression bisected] Stuttering in games caused by commit 4dfd6486 "drm: Use vblank timestamps to guesstimate how many vblanks were missed"

[bugzilla-dae...@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93147

--- Comment #3 from Dave Witbrodt <dawitbro at sbcglobal.net> ---
(In reply to Michel Dänzer from comment #2)
> Does running the affected apps with the environment variable
> LIBGL_DRI3_DISABLE=1 avoid the problem?

Yes, symptoms are completely eliminated in prboom-plus when using that
variable.

(I am currently using a kernel built from a local branch with fa4270d8 and
4dfd6486 reverted, but I have left my previous kernel installed.  I tested by
rebooting to the previous kernel, and running prboom-plus with and w/o the
variable set.)

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