Bug#801081: xserver-xorg-video-qxl: QXL video unusable due to performance
I need to add some information. Here is a link to a thread to Jessie downstream distro suffering from issue: https://forums.whonix.org/t/qxl-slowness-fix/1759
Fedora has some patches applied to QXL and maybe they would help:
http://pkgs.fedoraproject.org/cgit/rpms/xorg-x11-drv-qxl.git/tree/
http://pkgs.fedoraproject.org/cgit/rpms/xorg-x11-drv-qxl.git/tree/no-surfaces-kms.patch <- this one is interesting!!!
http://pkgs.fedoraproject.org/cgit/rpms/xorg-x11-drv-qxl.git/tree/qxl-kms-disable-composite.patch <- maybe of value
http://pkgs.fedoraproject.org/cgit/rpms/xorg-x11-drv-qxl.git/tree/0001-worst-hack-of-all-time-to-qxl-driver.patch <- if all else fails
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