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eee2d0b
(Get the code!)
The problem occurs for me while I wasn't using my computer. Gnome put the monitor into standby.
After moving my mouse the screen came back but it was like frozen. I could click on a launcher but it showed no reaction.
Then I switched to tty1 and back to graphical desktop and the screen was alive again.
But everything was slow, If I take a look at Xorg.0.log I see the following messages.
[ 5333.504] (WW) intel(0): I830DRI2GetMSC:1297 get vblank counter failed: Invalid argument
[ 5333.504] (WW) intel(0): I830DRI2Schedul
[ 5333.504] (WW) intel(0): I830DRI2GetMSC:1297 get vblank counter failed: Invalid argument
[ 5333.504] (WW) intel(0): first get vblank counter failed: Invalid argument
[ 5333.524] (WW) intel(0): I830DRI2GetMSC:1297 get vblank counter failed: Invalid argument
[ 5333.525] (WW) intel(0): I830DRI2Schedul
[ 5333.525] (WW) intel(0): I830DRI2GetMSC:1297 get vblank counter failed: Invalid argument
[ 5333.525] (WW) intel(0): first get vblank counter failed: Invalid argument
[ 5333.555] (WW) intel(0): I830DRI2GetMSC:1297 get vblank counter failed: Invalid argument
[ 5333.555] (WW) intel(0): I830DRI2Schedul
[ 5333.555] (WW) intel(0): first get vblank counter failed: Invalid argument
[ 5333.578] (WW) intel(0): I830DRI2Schedul
[ 5333.579] (WW) intel(0): first get vblank counter failed: Invalid argument
[ 5333.612] (WW) intel(0): I830DRI2Schedul
[ 5333.612] (WW) intel(0): first get vblank counter failed: Invalid argument
[ 5333.652] (WW) intel(0): first get vblank counter failed: Invalid argument
[ 5333.826] (WW) intel(0): first get vblank counter failed: Invalid argument
[ 5338.138] (WW) intel(0): first get vblank counter failed: Invalid argument
Somehow this reminds me of an old bug where the vblank counter got confused because of "DPMS off".
I hope this Information is somehow helpful.