[Bug 105308] X log ballooning in size with "drmmode_wait_vblank failed for scanout update" and "get vblank counter failed"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105308

--- Comment #4 from Michel Dänzer <michel at daenzer.net> ---
While the problem is occurring, and the screen contents are being updated at
least once per second, please run the following as root:

 echo 255 >/sys/module/drm/parameters/debug"; sleep 1; echo 0
>/sys/module/drm/parameters/debug

and attach the resulting dmesg output.

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