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[Achim <achim.frase@xxxxxxxxxxxxxx>]

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): I830DRI2ScheduleWaitMSC:1364 get vblank counter failed: Invalid argument
[  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): I830DRI2ScheduleWaitMSC:1364 get vblank counter failed: Invalid argument
[  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): I830DRI2ScheduleWaitMSC:1364 get vblank counter failed: Invalid argument
[  5333.555] (WW) intel(0): first get vblank counter failed: Invalid argument
[  5333.578] (WW) intel(0): I830DRI2ScheduleWaitMSC:1364 get vblank counter failed: Invalid argument
[  5333.579] (WW) intel(0): first get vblank counter failed: Invalid argument
[  5333.612] (WW) intel(0): I830DRI2ScheduleWaitMSC:1364 get vblank counter failed: Invalid argument
[  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.

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https://bugs.launchpad.net/bugs/868684

Title:
  Xorg freeze

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