Display becomes slow after booting and the Xorg log shows hung GPU disabling acceleration. lightdm crashed with SIGSEGV in check_stopped()

[Govinda Narayana Bhat]

Screen refresh becomes slow

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: lightdm 1.0.6-0ubuntu4
ProcVersionSignature: Ubuntu 3.2.0-6.12-generic 3.2.0-rc6
Uname: Linux 3.2.0-6-generic i686
ApportVersion: 1.90-0ubuntu1
Architecture: i386
Date: Sun Dec 25 17:55:20 2011
ExecutablePath: /usr/sbin/lightdm
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha i386 (20111206)
ProcCmdline: lightdm
ProcEnviron: PATH=(custom, no user)
SegvAnalysis:
 Segfault happened at: 0x8058e09: mov 0x14(%eax),%ecx
 PC (0x08058e09) ok
 source "0x14(%eax)" (0xaaaaaabe) not located in a known VMA region (needed readable region)!
 destination "%ecx" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: lightdm
StacktraceTop:
 ?? ()
 g_cclosure_marshal_VOID__VOID () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
 g_closure_invoke () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
 ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
 g_signal_emit_valist () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
Title: lightdm crashed with SIGSEGV in g_cclosure_marshal_VOID__VOID()
UpgradeStatus: Upgraded to precise on 2011-12-20 (4 days ago)
UserGroups:

[Apport retracing service (apport)]

StacktraceTop:
 check_stopped (seat=0x9f1b150) at seat.c:415
 g_cclosure_marshal_VOID__VOID (closure=0x9f2c648, return_value=0x0, n_param_values=1, param_values=0x9f1ea08, invocation_hint=0xbffd8250, marshal_data=0x0) at /build/buildd/glib2.0-2.31.4.tested/./gobject/gmarshal.c:85
 g_closure_invoke (closure=0x9f2c648, return_value=0x0, n_param_values=1, param_values=0x9f1ea08, invocation_hint=0xbffd8250) at /build/buildd/glib2.0-2.31.4.tested/./gobject/gclosure.c:774
 signal_emit_unlocked_R (node=0x9f2c4f0, detail=0, instance=0x9f2c810, emission_return=0x0, instance_and_params=0x9f1ea08) at /build/buildd/glib2.0-2.31.4.tested/./gobject/gsignal.c:3302
 g_signal_emit_valist (instance=0x9f2c810, signal_id=23, detail=0, var_args=0xbffd83fc "D\026\005\b") at /build/buildd/glib2.0-2.31.4.tested/./gobject/gsignal.c:3033

[Robert Ancell (robert-ancell)]

Closing assumed fixed.