I'm having the same problems on a Dell Inspiron 17R (N7010) laptop
running 11.04 with similar Intel onboard graphics:
00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated
Graphics Controller (rev 18) (prog-if 00 [VGA controller])
Subsystem: Dell Device 0457
Flags: bus master, fast devsel, latency 0, IRQ 41
Memory at f0000000 (64-bit, non-prefetchable) [size=4M]
Memory at d0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 1800 [size=8]
Expansion ROM at <unassigned> [disabled]
Capabilities: <access denied>
Kernel driver in use: i915
Kernel modules: i915
The problem seems to happen when the lid has been closed when I've left
the laptop; when I return and unlock the screen, all windows are
visible, the mouse pointer moves, but nothing responds to input. The
clock will be showing the time at which it stopped responding, it seems,
and the system load applet does not update.
I can switch to another terminal (e.g. Ctrl + Alt + F1) and the system
appears to be responding perfectly well. I can kill X (sudo pkill X)
and switch back to terminal 7, and log back in (as gdm restarts).
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https://bugs.launchpad.net/bugs/772925
Title:
Screen freezes after laptop lid closed for more than 1 minute
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