I am having the same issue on a Dell Latitude e5520m running Ubuntu
11.04 with gnome classic (I did not test this using Unity).
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core
Processor Family Integrated Graphics Controller (rev 09) (prog-if 00 [VGA
controller])
Subsystem: Dell Device 049a
Flags: bus master, fast devsel, latency 0, IRQ 42
Memory at e2800000 (64-bit, non-prefetchable) [size=4M]
Memory at d0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 8000 [size=64]
Expansion ROM at <unassigned> [disabled]
Capabilities: <access denied>
Kernel driver in use: i915
Kernel modules: i915
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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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