thinkpad t420: xserver restarts after login

[mejo]

Binary package hint: xserver-xorg-video-intel

Hello,

Occasionally the Xserver restarts itself immediately after login. I have a Thinkpad T420 with Nvidia Optimus, which I disabled in BIOS. Only the integrated Intel i2 processor graphics controller is used.

Now the exact symptom: I boot the fresh installed Natty (encrypted rootfs, installed from alternative CD), and GDM starts. Then I login, the unity desktop is started, and at that time the Xserver often simply restarts, and GDM login screen is displayed again. Sometimes the Xserver restart is triggered by a initial action, like starting an application.

This happens fairly often, and to make it even worse, most of the time it happens several times in a row: boot - login - Xserver restart - login - Xserver restart - login - and so on. After something like three to seven login attempts, the system suddenly works, and no Xserver restart happens any more.

If the first application was started by me after a login, and the Xserver didn't restart at that time, then it doesn't happen any more. In other words, this only happens at the very beginning of a login session.

This bug is not related to suspend and/or hybernate issues, as it only happens after fresh boot.

Greetings,
 jonas

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: xserver-xorg-video-intel 2:2.14.0-4ubuntu7.1
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,decor,mousepoll,vpswitch,regex,animation,snap,expo,move,compiztoolbox,place,grid,imgpng,gnomecompat,wall,ezoom,workarounds,staticswitcher,resize,fade,unitymtgrabhandles,scale,session,unityshell]
CompositorRunning: compiz
DRM.card0.LVDS.1:
 status: connected
 enabled: enabled
 dpms: On
 modes: 1600x900 1600x900
 edid-base64: AP///////wAGrz4hAAAAACEUAQSQHxF4AmGVnFlSjyYhUFQAAAABAQEBAQEBAQEBAQEBAQEB+CpAmmGEDDBAKjMANa4QAAAYpRxAmmGEDDBAKjMANa4QAAAYAAAA/gBBVU8KICAgICAgICAgAAAA/gBCMTQwUlcwMiBWMSAKANA=
DRM.card0.VGA.1:
 status: disconnected
 enabled: disabled
 dpms: Off
 modes:
 edid-base64:
Date: Tue May 24 18:51:51 2011
DistUpgraded: Fresh install
DistroCodename: natty
DistroVariant: ubuntu
GraphicsCard:
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0126] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device [17aa:21d0]
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110426)
MachineType: LENOVO 4180W1H
ProcEnviron:
 LANGUAGE=de:en
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-2.6.38-8-generic root=/dev/mapper/vgsys-root ro quiet splash vt.handoff=7
Renderer: Unknown
SourcePackage: xserver-xorg-video-intel
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/24/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 83ET52WW (1.22 )
dmi.board.asset.tag: Not Available
dmi.board.name: 4180W1H
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr83ET52WW(1.22):bd03/24/2011:svnLENOVO:pn4180W1H:pvrThinkPadT420:rvnLENOVO:rn4180W1H:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 4180W1H
dmi.product.version: ThinkPad T420
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.4+bzr20110415-0ubuntu2
version.ia32-libs: ia32-libs 20090808ubuntu13
version.libdrm2: libdrm2 2.4.23-1ubuntu6
version.libgl1-mesa-dri: libgl1-mesa-dri 7.10.2-0ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.2-0ubuntu2
version.xserver-xorg: xserver-xorg 1:7.6+4ubuntu3
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu4
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu7.1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu7

[mejo (jonas-freesources)]

Hey again,

The Xserver restart just happened again. A quick look into /var/log/Xorg.0.log.old revealed that the Xserver restart has a segmentation fault as reason.

I attach Xorg.0.log, Xorg.0.log.old, .xsession-errors and .xsession-errors.old for further details.

Greetings,
 jonas

[Albert Damen (albrt)]

[ 47.040] 4: /usr/bin/X (_CallCallbacks+0x34) [0x432af4]
[ 47.040] 5: /usr/bin/X (WriteToClient+0x21a) [0x461c9a]
[ 47.040] 6: /usr/lib/xorg/modules/extensions/libdri2.so (ProcDRI2WaitMSCReply+0x52) [0x7f07fc90ad82]
[ 47.040] 7: /usr/lib/xorg/modules/extensions/libdri2.so (DRI2WaitMSCComplete+0x59) [0x7f07fc909479]

This is a duplicate of bug 774978, which has a fix for testing in comment 25.