Comment 0 for bug 939858

When trying to switch to another user lightdm tries to start a new xserver (which crashes) and then the system stays on tty8.

Manually switching back to tty7 by pressing ALT-F8 works.

But it is not possible to start a new user session.

/var/log/Xorg.1.log contains:

[ 8756.298] (II) fglrx(0): Kernel Module Version Information:
[ 8756.298] (II) fglrx(0): Name: fglrx
[ 8756.298] (II) fglrx(0): Version: 8.91.4
[ 8756.298] (II) fglrx(0): Date: Oct 25 2011
[ 8756.298] (II) fglrx(0): Desc: ATI FireGL DRM kernel module
[ 8756.298] (II) fglrx(0): Kernel Module version matches driver.
[ 8756.299] (II) fglrx(0): Kernel Module Build Time Information:
[ 8756.299] (II) fglrx(0): Build-Kernel UTS_RELEASE: 3.0.0-16-generic
[ 8756.299] (II) fglrx(0): Build-Kernel MODVERSIONS: yes
[ 8756.299] (II) fglrx(0): Build-Kernel __SMP__: yes
[ 8756.299] (II) fglrx(0): Build-Kernel PAGE_SIZE: 0x1000
[ 8756.299] (II) fglrx(0): [uki] register handle = 0x00004000
[ 8756.299] (II) fglrx(0): FIREGL Board Found
[ 8756.307] (EE) fglrx(0): Not enough video memory to allocate shared Z/stencil buffer.
[ 8756.314] (II) fglrx(0): Shutdown CMMQS
[ 8756.317] (II) fglrx(0): [uki] removed 1 reserved context for kernel
[ 8756.317] (II) fglrx(0): [uki] unmapping 8192 bytes of SAREA 0xee000 at 0x7f7a68290000

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: fglrx-updates 2:8.911-0ubuntu0.1
ProcVersionSignature: Ubuntu 3.0.0-16.28-generic 3.0.17
Uname: Linux 3.0.0-16-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Thu Feb 23 22:59:26 2012
ProcEnviron:
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: fglrx-installer-updates
UpgradeStatus: Upgraded to oneiric on 2011-10-23 (123 days ago)