Comment 20 for bug 1452318

I confirm this problem with xserver-xorg-video-intel version 2:2.99.917 (the latest version at time of writing).
When I run in SNA mode, everything works perfectly until the machine resumes from suspend. After this everything becomes unbearably sluggish and it seems hardware acceleration no longer works (slow scrolling, video playback doesn't work, etc). Also once in a while I get the artifacts other people describe (distorted fonts, weird window titles, etc). This doesn't always happen though.

This bug also seems to occur even without suspending, when using it for sufficiently long time, probably triggered by something (at this point not sure what).

I tried to change to UXA mode which only partly solves the problem. Here I don't get the weird artifacts, but the hardware acceleration doesn't seem to work at all (no video acceleration, weird scroll even in file manager, etc).