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.
Bilal, I have same problems with a fully updated Oneiric running on a Dell notebook: ,D1-,D2- ,D3hot- ,D3cold- )
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-
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.