Comment 3 for bug 1784896

virgl was more of a secondary point, as that requires guest support that doesn't even really exist in most cases. The QXL default does seem broken though. At least in Ubuntu 16.04 guests that leads to a broken display if you change the resolution. I guess that's a bug in the 16.04 xserver QXL driver. Virtio seems to work a bit better at least but also with poor performance. I'll figure out how to have that discussion upstream.