[Bug 99418] DRI3 Stuttering while scrolling in Chromium/Chrome with VBLANK off

https://bugs.freedesktop.org/show_bug.cgi?id=99418

--- Comment #21 from Michel Dänzer michel@daenzer.net --- (In reply to lei.pero from comment #18)

I didn't know that about modesetting driver, anyway, even with LIBGL_DRI3_DISABLE=1 same thing happens.

Maybe chromium doesn't pass on the environment variable to its GPU helper process, or maybe there was still a chromium process around.

I don't how to disable tripple buffering to test it and if it's possible,

Only by changing the code, mesa/src/loader/loader_dri3_helper.c:dri3_update_num_back(). E.g. set num_back = 1 in the else case.