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[Andis Grosšteins <andis.grossteins@xxxxxxxxx>]

I've also encountered this bug on Ubuntu Karmic 9.10 with nvidia-glx-96 96.43.13-0ubuntu6.
So far I have tried to enable nvidia driver through jockey-gtk and Xserver goes into failsafe mode on startup.

I chose the troubleshooting option in notification dialog on startup and
backed up xorg.conf and log files.

last lines from :0.log may be related to fact that nvidias' driver is trying to initialise GART and fails :
-----
(II) NVIDIA(0): Initialized GART.

Backtrace:
0: /usr/bin/X(xorg_backtrace+0x3b) [0x8133d6b]
1: /usr/bin/X(xf86SigHandler+0x55) [0x80c7d35]
2: [0xe73400]
Saw signal 11.  Server aborting.
 ddxSigGiveUp: Closing log
 ddxSigGiveUp: re-raising 11
-----

my lspci -vvnn shows GART64- in status and command lines for my graphics
card:

01:00.0 VGA compatible controller [0300]: nVidia Corporation NV18 [GeForce4 MX 440 AGP 8x] [10de:0181] (rev c1)
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 248 (1250ns min, 250ns max)
	Interrupt: pin A routed to IRQ 16
	Region 0: Memory at ec000000 (32-bit, non-prefetchable) [size=16M]
	Region 1: Memory at e0000000 (32-bit, prefetchable) [size=128M]
	[virtual] Expansion ROM at ed000000 [disabled] [size=128K]
	Capabilities: [60] Power Management version 2
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [44] AGP version 3.0
		Status: RQ=32 Iso- ArqSz=0 Cal=3 SBA+ ITACoh- GART64- HTrans- 64bit- FW+ AGP3+ Rate=x4,x8
		Command: RQ=32 ArqSz=2 Cal=0 SBA+ AGP+ GART64- 64bit- FW- Rate=x8
	Kernel driver in use: nvidia
	Kernel modules: nvidia, nvidiafb

Maybe this error happens because gpu doesn't support GART?

I checked man nvidia-xconfig whisch says:
--nvagp=NVAGP, --no-nvagp
              Set  the  NvAGP  X  config  option value.  Possible values are 0 (no AGP), 1 (NVIDIA's AGP), 2 (AGPGART), 3 (try AGPGART, then try
              NVIDIA's AGP); these values can also be specified as 'none', 'nvagp', 'agpgart', or 'any'.

Further I ran:
sudo nvidia-xconfig --nvagp=1 to use only nvidiaagp

And now I'm going to restart and see if it helps.

-- 
nvidia-glx-96 forces Ubuntu 8.10 into low graphics mode with GeForce4 MX
https://bugs.launchpad.net/bugs/332048
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