modesetting driver plus DRI3 causes extremely slow scrolling with WebKitGTK+ in accelerated compositing mode

Submitted by Michael Catanzaro

Assigned to Xorg Project Team

Link to original bug (#85064)

Description

With Epiphany/WebKitGTK+, scrolling on many pages (such as any search results page on duckduckgo.com) is extremely slow and choppy. Launching epiphany with LIBGL_DRI3_DISABLE=1 causes these pages to work perfectly.

This is a critical bug for us since DuckDuckGo is our default search engine.

mesa-dri-drivers-10.3-1.20140927.fc21.x86_64 kernel-3.17.0-300.fc21.x86_64

See also

• https://bugs.freedesktop.org/show_bug.cgi?id=81623
• Bug 768478
• https://bugs.webkit.org/show_bug.cgi?id=160491
• https://bugzilla.redhat.com/show_bug.cgi?id=1367894
• https://launchpad.net/bugs/1615871