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[iuuuuan <ivan_janes@xxxxxxxx>]

I have similar problems too. The computer is Dell Optiplex GX 260.  I
have disabled compiz, power saving options and updated BIOS to latest
version A09.

Intel graphics is :
00:02.0 VGA compatible controller: Intel Corporation 82845G/GL[Brookdale-G]/GE Chipset Integrated Graphics Device (rev 01)
	Subsystem: Dell Device 0126
	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
	Interrupt: pin A routed to IRQ 16
	Region 0: Memory at e8000000 (32-bit, prefetchable) [size=128M]
	Region 1: Memory at ff680000 (32-bit, non-prefetchable) [size=512K]
	Capabilities: [d0] Power Management version 1
		Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-
	Kernel driver in use: i915
	Kernel modules: i915

Kernel panic section is :
[248401.076087] i915/0        D c08145c0     0   253      2 0x00000000
[248401.076097]  f6a2df04 00000046 eaa56000 c08145c0 f6ac4df8 c08145c0 3a030219 0000e1c7
[248401.076110]  c08145c0 c08145c0 f6ac4df8 c08145c0 00000000 0000e1c7 c08145c0 f68b4e00
[248401.076122]  f6ac4b60 f68cac14 f68cac18 ffffffff f6a2df30 c056f776 c0748e80 f68cac1c
[248401.076133] Call Trace:
[248401.076157]  [<c056f776>] __mutex_lock_slowpath+0xc6/0x130
[248401.076163]  [<c056f690>] mutex_lock+0x20/0x40
[248401.076215]  [<f8257c0a>] i915_gem_retire_work_handler+0x2a/0x70 [i915]
[248401.076228]  [<c0157a7e>] run_workqueue+0x6e/0x140
[248401.076244]  [<f8257be0>] ? i915_gem_retire_work_handler+0x0/0x70 [i915]
[248401.076251]  [<c0157bd8>] worker_thread+0x88/0xe0
[248401.076258]  [<c015c280>] ? autoremove_wake_function+0x0/0x40
[248401.076264]  [<c0157b50>] ? worker_thread+0x0/0xe0
[248401.076270]  [<c015bf8c>] kthread+0x7c/0x90
[248401.076275]  [<c015bf10>] ? kthread+0x0/0x90
[248401.076283]  [<c0104007>] kernel_thread_helper+0x7/0x10

I have modified xorg.conf file - added AccelMethod "uxa", put only one
resultion in screen section, disabled all the modules in section
Modules.

Section "Device"
        Identifier      "Configured Video Device"
        Boardname       "Intel 845"
        Busid           "PCI:0:2:0"
        Driver          "intel"
        Screen  0
        Vendorname      "Intel"
        Option "AccelMethod" "uxa"
EndSection

Section "Monitor"
        Identifier      "Configured Monitor"
        Vendorname      "Samsung"
        Modelname       "Samsung SyncMaster 171S/175S/170S/CX175S-AZ/LX175S"
        Horizsync       30-81
        Vertrefresh     56-85
  modeline  "1280x1024@75" 135.0 1280 1296 1440 1688 1024 1025 1028 1066 +hsync +vsync
        Gamma   1.0
EndSection

Section "Screen"
        Identifier      "Default Screen"
        Device          "Configured Video Device"
        Monitor         "Configured Monitor"
        Defaultdepth    24
        SubSection "Display"
                Depth   24
                Virtual 1280    1024
                Modes           "1280x1024@75"  
        EndSubSection
EndSection

Section "ServerLayout"
        Identifier      "Default Layout"
  screen 0 "Default Screen" 0 0
EndSection
Section "Module"
#       Load            "glx"
#       Load            "GLcore"
#       Load            "dri"
#       Load            "v4l"
EndSection
Section "ServerFlags"
EndSection

Nothing helps :(

-- 
[i945G] karmic: INFO: task i915/* blocked for more than 120 seconds.
https://bugs.launchpad.net/bugs/451518
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