[Bug 85064] Intel DRI3 causes extremely slow scrolling on certain pages with WebKitGTK+

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85064

--- Comment #23 from Martin Peres <martin.peres at free.fr> ---
(In reply to Michel Dänzer from comment #22)
> (In reply to Martin Peres from comment #21)
> > I tried using the modesetting driver and got absolute garbage out. Stale
> > rendering, extreme slowness. Why didn't I think of this before...
> > 
> > Anyway, will try to see if I can fix this issue. Seems like I will have a
> > happy time in glamor and mesa's code tomorrow.
> 
> Note that I couldn't reproduce this problem with xf86-video-ati using
> glamor. I guess the problem could be in the Mesa driver, but the modesetting
> driver seems more likely.

Well, the problem is likely limited to Intel. We will likely need a patch like
this one[1] until we get explicit fencing.

[1]
http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/commit/?id=fc984e8953d61901b255422c8f56eb79a2dd2a28

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