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[Dirk F <1367386@xxxxxxxxxxxxxxxxxx>]

Whereas in 10.10, the reverse problem occurred (bug 209018): XAA worked
and EXA crashed.

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https://bugs.launchpad.net/bugs/1367386

Title:
  Xorg crash with Trident driver after Xubuntu upgrade to Trusty

Status in “xorg” package in Ubuntu:
  New

Bug description:
  After upgrading Xubuntu 12.04 LTS -> 14.04.1 LTS, system boots to
  black screen instead of desktop environment,  but single user command
  line works fine. Problem traced to xorg-server segfault crash in the
  Trident driver as below (summary of details already uploaded). The
  code attempts a call to an offset against eax which is a null pointer.

  After changing the acceleration architecture from XAA to EXA with 
      Option "AccelMethod"    "exa"
  in the Trident Device section of xorg.conf, the desktop environment loaded successfully.

  Maybe this option should now be the default for Trident?

  ProblemType: Crash
  Architecture: i386
  CrashCounter: 1
  Date: Tue Sep  9 13:26:36 2014
  DistroRelease: Ubuntu 14.04
  ExecutablePath: /usr/bin/Xorg
  ExecutableTimestamp: 1406679727
  ProcCmdline: /usr/bin/X -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nol
  isten tcp vt7 -novtswitch
  ProcCwd: /etc/X11
  ProcEnviron: 

  Disassembly:
   => 0xb6cb39d1:	call   *0x6c(%eax)
      0xb6cb39d4:	jmp    0xb6cb3979
      0xb6cb39d6:	lea    0x0(%esi),%esi
      0xb6cb39d9:	lea    0x0(%edi,%eiz,1),%edi
      0xb6cb39e0:	push   %ebp
      0xb6cb39e1:	mov    %eax,%ebp
      0xb6cb39e3:	push   %edi
      0xb6cb39e4:	xor    %edi,%edi
      0xb6cb39e6:	push   %esi
      0xb6cb39e7:	mov    $0x20000,%esi
      0xb6cb39ec:	push   %ebx
      0xb6cb39ed:	sub    $0x1c,%esp
      0xb6cb39f0:	mov    0x18(%eax),%eax
      0xb6cb39f3:	call   0xb6caa4f0
      0xb6cb39f8:	add    $0x14608,%ebx
      0xb6cb39fe:	sub    $0x17,%eax
  Package: xserver-xorg-core 2:1.15.1-0ubuntu2.1
  PackageArchitecture: i386
  ProcVersionSignature: Ubuntu 3.13.0-36.63-generic 3.13.11.6
  Registers:
   eax            0x0	0
   ecx            0x0	0
   edx            0xb96d7cb0	-1184006992
   ebx            0xb6cc8000	-1228111872
   esp            0xbf887300	0xbf887300
   ebp            0xb96d5688	0xb96d5688
   esi            0xb96d3f98	-1184022632
   edi            0xb96d43f8	-1184021512
   eip            0xb6cb39d1	0xb6cb39d1
   eflags         0x213202	[ IF #12 #13 RF ID ]
   cs             0x73	115
   ss             0x7b	123
   ds             0x7b	123
   es             0x7b	123
   fs             0x0	0
   gs             0x33	51
  SegvAnalysis:
   Segfault happened at: 0xb6cb39d1:	call   *0x6c(%eax)
   PC (0xb6cb39d1) ok
   source "*0x6c(%eax)" ok
   destination "(%esp)" (0xbf887300) ok
   SP (0xbf887300) ok
   Reason could not be automatically determined.
  SourcePackage: xorg-server
  ...
  Title: Xorg crashed with SIGSEGV in xf86VTSwitch()
  UpgradeStatus: Upgraded to trusty on 2014-09-07 (2 days ago)
  _MarkForUpload: True

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8
  ProcVersionSignature: Ubuntu 3.13.0-36.63-generic 3.13.11.6
  Uname: Linux 3.13.0-36-generic i686
  ApportVersion: 2.14.1-0ubuntu3.4
  Architecture: i386
  CurrentDesktop: XFCE
  Date: Tue Sep  9 18:09:01 2014
  SourcePackage: xorg
  UpgradeStatus: Upgraded to trusty on 2014-09-07 (2 days ago)

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