https://bugs.freedesktop.org/show_bug.cgi?id=89374
--- Comment #8 from Michel Dänzer michel@daenzer.net --- (In reply to sunweb from comment #7)
On top of that, enabling glamor breaks my experiance with Gwenview, it simply hangs, shows first picture and hangs.
That would need to be tracked in a separate report, with detailed information about the versions of gwenview/KDE/Qt and how to reproduce it.
I also have to enable vsync in KDE settings to prevent tearing and set it to "full scene repaints" any other option give no result and "re-use screen content" simply kills any desktop experiance to that point you can't use menus, drag windows(that are already open) or open new ones, awful flickering etc.
With current xf86-video-ati Git master, you can enable DRI3 with Option "DRI3" in xorg.conf. Then "Re-use screen content" should work well. The breakage without that sounds like a kwin issue.