Now I switched to Nvidia graphics (from intel integrated graphics), and
the freeze problem never appear any more. However, I think this should
be a workaround instead of a solution.
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https://bugs.launchpad.net/bugs/1045702
Title:
[sandybridge-gt1] GPU lockup IPEHR: 0x78170003
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Public bug reported:
For a few times a day, the PC freezes.
I didn't do anything special when the freeze takes place. And after the
PC is frozen, mouse and keyboard has no response (including kernel code
like alt+sysrq+reisub does nothing).
ProblemType: Crash
DistroRelease: Ubuntu 12.10
Package:
After recent update, the problem has gone. Now I can connect multi-head
without problem.
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https://bugs.launchpad.net/bugs/965440
Title:
Xorg freeze after connecting to external dis
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https://bugs.launchpad.net/bugs/965440
Title:
Xorg freeze after connecting to external display
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Public bug reported:
Today when I connect to external display (both from suspend or when the
laptop is running), display freezes with random colors on it. Neither
keyboard or mouse is responsive. Even Ctrl-Alt-Backspace does not work.
I could only reboot using kernel command SysRq-reisub.
Last we
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