It sounds like either the MI_WAIT_FOR_EVENT hang or the page-flip verus
modeset race. I cannot tell with an error state, and both should be
fixed in updates.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1005349
Title:
Lenovo T520 Docking Station w/ External Monitor Crashes
Status in “xserver-xorg-video-intel” package in Ubuntu:
Incomplete
Bug description:
Running Ubuntu 12.04 LTS on a Lenovo T520 with standard Intel HD
Graphics 3000 and a docking station. Any time I switch to dual-
monitors, the system freezes, and I see the cursor appear over a black
screen on the laptop LCD screen.
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