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[Bug 1434557] [NEW] frozen desktop

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Public bug reported:

Very often (about once/day) I'm experiencing a frozen desktop.  minimal
response from keyboard or mouse, usually degrades to no response.   No
response from ^-alt-F1 or ^-alt-esc.      Here's today's
Xorg.0.log.old:

[    47.809] (II) intel(0): Modeline "1280x1024"x0.0  108.00  1280 1328 1440 1688  1024 1025 1028 1066 +hsync +vsync (64.0 kHz e)
[    47.809] (II) intel(0): Modeline "1280x960"x0.0  108.00  1280 1376 1488 1800  960 961 964 1000 +hsync +vsync (60.0 kHz e)
[  3682.886] (II) intel(0): switch to mode 1680x1050@59.9 on VGA1 using pipe 0, position (0, 0), rotation normal, reflection none
[  3683.260] (II) AIGLX: Suspending AIGLX clients for VT switch
[  3735.480] (II) AIGLX: Resuming AIGLX clients after VT switch
[  3735.480] (II) intel(0): switch to mode 1680x1050@59.9 on VGA1 using pipe 0, position (0, 0), rotation normal, reflection none
[  7662.648] (II) intel(0): switch to mode 1680x1050@59.9 on VGA1 using pipe 0, position (0, 0), rotation normal, reflection none
[  7662.999] (II) AIGLX: Suspending AIGLX clients for VT switch
[  7807.242] (II) AIGLX: Resuming AIGLX clients after VT switch
[  7807.242] (II) intel(0): switch to mode 1680x1050@59.9 on VGA1 using pipe 0, position (0, 0), rotation normal, reflection none
[  9095.040] (II) intel(0): switch to mode 1680x1050@59.9 on VGA1 using pipe 0, position (0, 0), rotation normal, reflection none
[  9095.404] (II) AIGLX: Suspending AIGLX clients for VT switch
[  9896.981] (II) AIGLX: Resuming AIGLX clients after VT switch
[  9896.981] (II) intel(0): switch to mode 1680x1050@59.9 on VGA1 using pipe 0, position (0, 0), rotation normal, reflection none
(EE) [mi] EQ overflowing.  Additional events will be discarded until existing events are processed.
(EE) 
(EE) Backtrace:
(EE) 0: /usr/bin/X (xorg_backtrace+0x4f) [0xb7686eaf]
(EE) 1: /usr/bin/X (mieqEnqueue+0x213) [0xb7666fe3]
(EE) 2: /usr/bin/X (QueuePointerEvents+0x6d) [0xb75342ed]
(EE) 3: /usr/bin/X (xf86PostMotionEventM+0x24b) [0xb756da8b]
(EE) 4: /usr/lib/xorg/modules/input/evdev_drv.so (0xb6e12000+0x498f) [0xb6e1698f]
(EE) 5: /usr/bin/X (0xb74df000+0x7e0f5) [0xb755d0f5]
(EE) 6: /usr/bin/X (0xb74df000+0xa8dfb) [0xb7587dfb]
(EE) 7: (vdso) (__kernel_sigreturn+0x0) [0xb74bc400]
(EE) 8: /usr/bin/X (0xb74df000+0x1ac170) [0xb768b170]
(EE) 9: (vdso) (__kernel_sigreturn+0x0) [0xb74bc400]
(EE) 10: /usr/bin/X (0xb74df000+0x12d650) [0xb760c650]
(EE) 11: /usr/bin/X (0xb74df000+0x4ebb0) [0xb752dbb0]
(EE) 12: /usr/bin/X (DeliverRawEvent+0x65) [0xb752ddb5]
(EE) 13: /usr/bin/X (0xb74df000+0x131730) [0xb7610730]
(EE) 14: /usr/bin/X (0xb74df000+0x155a07) [0xb7634a07]
(EE) 15: /usr/bin/X (mieqProcessDeviceEvent+0x204) [0xb7667414]
(EE) 16: /usr/bin/X (mieqProcessInputEvents+0xfd) [0xb766753d]
(EE) 17: /usr/bin/X (ProcessInputEvents+0x14) [0xb755d294]
(EE) 18: /usr/bin/X (0xb74df000+0x3c9ac) [0xb751b9ac]
(EE) 19: /usr/bin/X (0xb74df000+0x40ce5) [0xb751fce5]
(EE) 20: /usr/bin/X (0xb74df000+0x2aa3e) [0xb7509a3e]
(EE) 21: /lib/i386-linux-gnu/libc.so.6 (__libc_start_main+0xf3) [0xb70b6a83]
(EE) 22: /usr/bin/X (0xb74df000+0x2aa74) [0xb7509a74]
(EE) 
(EE) [mi] These backtraces from mieqEnqueue may point to a culprit higher up the stack.
(EE) [mi] mieq is *NOT* the cause.  It is a victim.
(EE) [mi] EQ overflow continuing.  100 events have been dropped.
(EE) 
(EE) Backtrace:
(EE) 0: /usr/bin/X (xorg_backtrace+0x4f) [0xb7686eaf]
(EE) 1: /usr/bin/X (mieqEnqueue+0xe5) [0xb7666eb5]
(EE) 2: /usr/bin/X (QueuePointerEvents+0x6d) [0xb75342ed]
(EE) 3: /usr/bin/X (xf86PostMotionEventM+0x24b) [0xb756da8b]
(EE) 4: /usr/lib/xorg/modules/input/evdev_drv.so (0xb6e12000+0x498f) [0xb6e1698f]
(EE) 5: /usr/bin/X (0xb74df000+0x7e0f5) [0xb755d0f5]
(EE) 6: /usr/bin/X (0xb74df000+0xa8dfb) [0xb7587dfb]
(EE) 7: (vdso) (__kernel_sigreturn+0x0) [0xb74bc400]
(EE) 8: /usr/bin/X (0xb74df000+0x1ac170) [0xb768b170]
(EE) 9: (vdso) (__kernel_sigreturn+0x0) [0xb74bc400]
(EE) 10: /usr/bin/X (0xb74df000+0x13163d) [0xb761063d]
(EE) 11: /usr/bin/X (0xb74df000+0x15d2ba) [0xb763c2ba]
(EE) 12: /usr/bin/X (mieqProcessDeviceEvent+0x1d6) [0xb76673e6]
(EE) 13: /usr/bin/X (mieqProcessInputEvents+0xfd) [0xb766753d]
(EE) 14: /usr/bin/X (ProcessInputEvents+0x14) [0xb755d294]
(EE) 15: /usr/bin/X (0xb74df000+0x3c9ac) [0xb751b9ac]
(EE) 16: /usr/bin/X (0xb74df000+0x40ce5) [0xb751fce5]
(EE) 17: /usr/bin/X (0xb74df000+0x2aa3e) [0xb7509a3e]
(EE) 18: /lib/i386-linux-gnu/libc.so.6 (__libc_start_main+0xf3) [0xb70b6a83]
(EE) 19: /usr/bin/X (0xb74df000+0x2aa74) [0xb7509a74]
(EE) 
[ 11472.953] [mi] EQ processing has resumed after 132 dropped events.
[ 11473.029] [mi] This may be caused my a misbehaving driver monopolizing the server's resources.

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

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https://bugs.launchpad.net/bugs/1434557

Title:
  frozen desktop

Status in xorg package in Ubuntu:
  New

Bug description:
  Very often (about once/day) I'm experiencing a frozen desktop.
  minimal response from keyboard or mouse, usually degrades to no
  response.   No response from ^-alt-F1 or ^-alt-esc.      Here's
  today's  Xorg.0.log.old:

  [    47.809] (II) intel(0): Modeline "1280x1024"x0.0  108.00  1280 1328 1440 1688  1024 1025 1028 1066 +hsync +vsync (64.0 kHz e)
  [    47.809] (II) intel(0): Modeline "1280x960"x0.0  108.00  1280 1376 1488 1800  960 961 964 1000 +hsync +vsync (60.0 kHz e)
  [  3682.886] (II) intel(0): switch to mode 1680x1050@59.9 on VGA1 using pipe 0, position (0, 0), rotation normal, reflection none
  [  3683.260] (II) AIGLX: Suspending AIGLX clients for VT switch
  [  3735.480] (II) AIGLX: Resuming AIGLX clients after VT switch
  [  3735.480] (II) intel(0): switch to mode 1680x1050@59.9 on VGA1 using pipe 0, position (0, 0), rotation normal, reflection none
  [  7662.648] (II) intel(0): switch to mode 1680x1050@59.9 on VGA1 using pipe 0, position (0, 0), rotation normal, reflection none
  [  7662.999] (II) AIGLX: Suspending AIGLX clients for VT switch
  [  7807.242] (II) AIGLX: Resuming AIGLX clients after VT switch
  [  7807.242] (II) intel(0): switch to mode 1680x1050@59.9 on VGA1 using pipe 0, position (0, 0), rotation normal, reflection none
  [  9095.040] (II) intel(0): switch to mode 1680x1050@59.9 on VGA1 using pipe 0, position (0, 0), rotation normal, reflection none
  [  9095.404] (II) AIGLX: Suspending AIGLX clients for VT switch
  [  9896.981] (II) AIGLX: Resuming AIGLX clients after VT switch
  [  9896.981] (II) intel(0): switch to mode 1680x1050@59.9 on VGA1 using pipe 0, position (0, 0), rotation normal, reflection none
  (EE) [mi] EQ overflowing.  Additional events will be discarded until existing events are processed.
  (EE) 
  (EE) Backtrace:
  (EE) 0: /usr/bin/X (xorg_backtrace+0x4f) [0xb7686eaf]
  (EE) 1: /usr/bin/X (mieqEnqueue+0x213) [0xb7666fe3]
  (EE) 2: /usr/bin/X (QueuePointerEvents+0x6d) [0xb75342ed]
  (EE) 3: /usr/bin/X (xf86PostMotionEventM+0x24b) [0xb756da8b]
  (EE) 4: /usr/lib/xorg/modules/input/evdev_drv.so (0xb6e12000+0x498f) [0xb6e1698f]
  (EE) 5: /usr/bin/X (0xb74df000+0x7e0f5) [0xb755d0f5]
  (EE) 6: /usr/bin/X (0xb74df000+0xa8dfb) [0xb7587dfb]
  (EE) 7: (vdso) (__kernel_sigreturn+0x0) [0xb74bc400]
  (EE) 8: /usr/bin/X (0xb74df000+0x1ac170) [0xb768b170]
  (EE) 9: (vdso) (__kernel_sigreturn+0x0) [0xb74bc400]
  (EE) 10: /usr/bin/X (0xb74df000+0x12d650) [0xb760c650]
  (EE) 11: /usr/bin/X (0xb74df000+0x4ebb0) [0xb752dbb0]
  (EE) 12: /usr/bin/X (DeliverRawEvent+0x65) [0xb752ddb5]
  (EE) 13: /usr/bin/X (0xb74df000+0x131730) [0xb7610730]
  (EE) 14: /usr/bin/X (0xb74df000+0x155a07) [0xb7634a07]
  (EE) 15: /usr/bin/X (mieqProcessDeviceEvent+0x204) [0xb7667414]
  (EE) 16: /usr/bin/X (mieqProcessInputEvents+0xfd) [0xb766753d]
  (EE) 17: /usr/bin/X (ProcessInputEvents+0x14) [0xb755d294]
  (EE) 18: /usr/bin/X (0xb74df000+0x3c9ac) [0xb751b9ac]
  (EE) 19: /usr/bin/X (0xb74df000+0x40ce5) [0xb751fce5]
  (EE) 20: /usr/bin/X (0xb74df000+0x2aa3e) [0xb7509a3e]
  (EE) 21: /lib/i386-linux-gnu/libc.so.6 (__libc_start_main+0xf3) [0xb70b6a83]
  (EE) 22: /usr/bin/X (0xb74df000+0x2aa74) [0xb7509a74]
  (EE) 
  (EE) [mi] These backtraces from mieqEnqueue may point to a culprit higher up the stack.
  (EE) [mi] mieq is *NOT* the cause.  It is a victim.
  (EE) [mi] EQ overflow continuing.  100 events have been dropped.
  (EE) 
  (EE) Backtrace:
  (EE) 0: /usr/bin/X (xorg_backtrace+0x4f) [0xb7686eaf]
  (EE) 1: /usr/bin/X (mieqEnqueue+0xe5) [0xb7666eb5]
  (EE) 2: /usr/bin/X (QueuePointerEvents+0x6d) [0xb75342ed]
  (EE) 3: /usr/bin/X (xf86PostMotionEventM+0x24b) [0xb756da8b]
  (EE) 4: /usr/lib/xorg/modules/input/evdev_drv.so (0xb6e12000+0x498f) [0xb6e1698f]
  (EE) 5: /usr/bin/X (0xb74df000+0x7e0f5) [0xb755d0f5]
  (EE) 6: /usr/bin/X (0xb74df000+0xa8dfb) [0xb7587dfb]
  (EE) 7: (vdso) (__kernel_sigreturn+0x0) [0xb74bc400]
  (EE) 8: /usr/bin/X (0xb74df000+0x1ac170) [0xb768b170]
  (EE) 9: (vdso) (__kernel_sigreturn+0x0) [0xb74bc400]
  (EE) 10: /usr/bin/X (0xb74df000+0x13163d) [0xb761063d]
  (EE) 11: /usr/bin/X (0xb74df000+0x15d2ba) [0xb763c2ba]
  (EE) 12: /usr/bin/X (mieqProcessDeviceEvent+0x1d6) [0xb76673e6]
  (EE) 13: /usr/bin/X (mieqProcessInputEvents+0xfd) [0xb766753d]
  (EE) 14: /usr/bin/X (ProcessInputEvents+0x14) [0xb755d294]
  (EE) 15: /usr/bin/X (0xb74df000+0x3c9ac) [0xb751b9ac]
  (EE) 16: /usr/bin/X (0xb74df000+0x40ce5) [0xb751fce5]
  (EE) 17: /usr/bin/X (0xb74df000+0x2aa3e) [0xb7509a3e]
  (EE) 18: /lib/i386-linux-gnu/libc.so.6 (__libc_start_main+0xf3) [0xb70b6a83]
  (EE) 19: /usr/bin/X (0xb74df000+0x2aa74) [0xb7509a74]
  (EE) 
  [ 11472.953] [mi] EQ processing has resumed after 132 dropped events.
  [ 11473.029] [mi] This may be caused my a misbehaving driver monopolizing the server's resources.

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