[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 #30 from Martin Peres <martin.peres at free.fr> ---
(In reply to Leho Kraav (:macmaN :lkraav) from comment #29)
> I think I bumped into this today. Running gentoo and this package set:
> 
> x11-drivers/xf86-video-intel-2.99.917_p20160218 USE="dri3 uxa" (so GLAMOR,
> not SNA)
> media-libs/mesa-11.0.6 USE=dri3
> www-client/google-chrome-48.0.2564.116_p1
> x11-base/xorg-server-1.18.1 USE=glamor
> x11-wm/i3-4.11
> 
> Hardware: DELL E7440 Haswell, with HDMI monitor directly connected, DP
> monitor connected through dock port.
> 
> Strange thing compared to previous comments is that Chrome slows down to a
> crawl *only* when moved to the third, DP monitor. Everything works OK when
> chrome is sent to laptop eDP panel, or HDMI monitor.
> 
> Launching with
> 
> $ LIBGL_DRI3_DISABLE=1 google-chrome-stable
> 
> successfully works around the problem, so seems to indicate this bug is the
> right place to be. Let me know if there's another, possibly more accurate
> bug available.
> 
> What's the possible next step here?

Please send me your Xorg logs. I want to make sure you really are using the
intel driver and not the modesetting driver.

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