[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 #29 from Leho Kraav (:macmaN :lkraav) <leho at kraav.com> ---
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?

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