This should be a better fix. Does it fix the problem?
** Also affects: xserver-xorg-driver-ati
Importance: Undecided
Status: New
** Patch added: "Wait for pending flips to complete before turning off a CRTC"
https://bugs.launchpad.net/xserver-xorg-driver-ati/+bug/1577170/+attachment/4669987/+files/0001-Wait-for-pending-flips-to-complete-before-turning-of.patch
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https://bugs.launchpad.net/bugs/1577170
Title:
[solved] screen cannot be turned back on after being switched off
after some time of inactivity
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