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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #24 from lei.pero at gmail.com ---
(In reply to Michel Dänzer from comment #23)
> (In reply to lei.pero from comment #22)
> > Ok, I've built mesa with that parameter changed and installed, same
> > behavior. I've cloned just "git://anongit.freedesktop.org/git/mesa/mesa" ,
> > it should be enough.
> 
> Did you verify that it's hitting the path you modified? E.g. if chromium is
> fullscreen and there's no compositor, it may hit the if case instead of the
> else case. Maybe try changing the if case to 2 buffers as well.

Yeah, it is the same, but, it might be that it is not a bug with mesa at
all(?).

Long story short, after investigating further, it turns out that DRI3 works
quite well with compiz, marco and in lxde, lxqt. The actual problem happens
only when mutter is window manager (still, it doesn't explain why it works well
with DRI2), I've tried MATE DE with different WM and as expected, all others
work well except mutter.

Hope this new info helps, and if it turns out it is mutter bug and not DRI3
(doesn't make sense), I apologize for wasting your time (should have done this
earlier...), and we can close/delete this bug report. It still doesn't make any
sense why it would work well with DRI2 but not DRI3 on mutter.

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