Comment 3 for bug 880768

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Márton Kiss (marton-kiss) wrote : Re: The whole window manger sometimes freezes when switching workspaces or when opening the workspace switcher

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.