Bilal, I have same problems with a fully updated Oneiric running on a Dell
notebook:
lspci -vv
...
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML
Express Integrated Graphics Controller (rev 03)
Subsystem: Dell Device 01d4
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
Latency: 0
Region 0: Memory at eff80000 (32-bit, non-prefetchable) [size=512K]
Capabilities: [d0] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
...
It seems to be total non-deterministic, so currently I cannot reproduce, but it
happens 3-5 times per a work day.
A not too user friendly workaround is switching back to console
(Ctrl+Alt+F1), then restart lightdm. It just helps to avoid a full
reboot process.
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https://bugs.launchpad.net/bugs/880768
Title:
The whole window manger sometimes freezes when switching workspaces or
when opening the workspace switcher
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