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I did a jaunty to karmic update with "update-manager -d" today, I am at
current karmic Release Candidate.

After reboot I selected the karmic kernel on grub (not grub2) and I
could not boot. Ubuntu logo appeared on screen and after a while I
noticed a console trying to pop on the screen. It seemed something
related to resolution detection so I rebooted the computer and I
replaced:

kernel          /boot/vmlinuz-2.6.31-14-generic root=UUID=98b97285-2d0b-45df-8300-b1b6c7164e1e ro quiet splash vga=786
with 
kernel          /boot/vmlinuz-2.6.31-14-generic root=UUID=98b97285-2d0b-45df-8300-b1b6c7164e1e ro quiet splash

I had no idea what this meant. I was lucky. Ubuntu booted perfectly.

My syslog had a lot of:

Oct 25 12:26:27 sergio-ubuntu acpid: client connected from 1811[0:0]
Oct 25 12:26:27 sergio-ubuntu kernel: [   66.603886] agpgart-intel 0000:00:00.0: AGP 3.0 bridge
Oct 25 12:26:27 sergio-ubuntu kernel: [   66.603909] agpgart-intel 0000:00:00.0: putting AGP V3 device into 8x mode
Oct 25 12:26:27 sergio-ubuntu kernel: [   66.603952] nvidia 0000:01:00.0: putting AGP V3 device into 8x mode
Oct 25 12:26:27 sergio-ubuntu kernel: [   66.899369] Xorg:1811 conflicting memory types f0000000-f0500000 uncached-minus<->write-combining
Oct 25 12:26:27 sergio-ubuntu kernel: [   66.899375] reserve_memtype failed 0xf0000000-0xf0500000, track uncached-minus, req write-combining
Oct 25 12:26:27 sergio-ubuntu kernel: [   66.899637] Xorg:1811 conflicting memory types f0000000-f0500000 uncached-minus<->write-combining
Oct 25 12:26:27 sergio-ubuntu kernel: [   66.899642] reserve_memtype failed 0xf0000000-0xf0500000, track uncached-minus, req write-combining
Oct 25 12:26:27 sergio-ubuntu gdm-binary[1786]: WARNING: GdmDisplay: display lasted 0,712939 seconds
Oct 25 12:26:27 sergio-ubuntu acpid: client 1811[0:0] has disconnected


Which I suspect can help to locate the problem.

lspci | grep "VGA" 
01:00.0 VGA compatible controller: nVidia Corporation NV18 [GeForce4 MX 4000] (rev c1)


I didn't expect Ubuntu installation failing at resolution detection and leaving me without GUI. I thought Ubuntu had fail-safe mechanisms to prevent that. Anyway, I imagine this are the risks of a "release candidate".

Sorry if the bug was already reported, I could not find it.

ProblemType: Crash
Architecture: i386
Date: Sun Oct 25 12:26:08 2009
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/bin/Xorg
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
NonfreeKernelModules: nvidia
Package: xserver-xorg-core 2:1.6.4-2ubuntu3 [modified: usr/lib/xorg/modules/extensions/libglx.so]
ProcCmdLine: root=UUID=98b97285-2d0b-45df-8300-b1b6c7164e1e ro quiet splash
ProcCmdline: /usr/bin/X :1 -br -verbose -auth /var/run/gdm/auth-for-gdm-K5Hlqi/database -nolisten tcp
ProcEnviron:
 LANG=ca_ES.UTF-8
 PATH=(custom, no user)
 LANGUAGE=ca_ES:ca:en_GB:en
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
RelatedPackageVersions:
 xserver-xorg 1:7.4+3ubuntu7
 libgl1-mesa-glx 7.6.0-1ubuntu4
 libdrm2 2.4.14-1ubuntu1
 xserver-xorg-video-intel 2:2.9.0-1ubuntu2
 xserver-xorg-video-ati 1:6.12.99+git20090929.7968e1fb-0ubuntu1
SegvAnalysis:
 Segfault happened at: 0x91ad7ae:	movzwl 0xe(%edx),%eax
 PC (0x091ad7ae) ok
 source "0xe(%edx)" (0x0000000e) not located in a known VMA region (needed readable region)!
 destination "%eax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: xorg-server
Stacktrace:
 #0  0x091ad7ae in ?? () from /usr/lib/xorg/modules/drivers//nvidia_drv.so
 No symbol table info available.
 #1  0x00000000 in ?? ()
 No symbol table info available.
StacktraceTop:
 ?? () from /usr/lib/xorg/modules/drivers//nvidia_drv.so
 ?? ()
Title: Xorg crashed with SIGSEGV
Uname: Linux 2.6.31-14-generic i686
UserGroups:
 
dmi.bios.date: 08/21/2003
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 080009
dmi.board.name: SpringDale-G
dmi.board.vendor: INTEL
dmi.board.version: A1
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr080009:bd08/21/2003:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnINTEL:rnSpringDale-G:rvrA1:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.
fglrx: Not loaded
system:
 distro:             Ubuntu
 architecture:       i686kernel:             2.6.31-14-generic

** Affects: xorg-server (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-crash i386 need-i386-retrace
-- 
grub vga option made karmic not boot
https://bugs.edge.launchpad.net/bugs/460373
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