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[dg <dan.g@xxxxxxxxx>]

Getting the same on my Lenovo W510.

Ubuntu 11.04 64-bit - uptodate
KDE 4.6.2
Gnome 2.32.0
nvidia-current 270.41.06-0ubuntu1
nouveau 0.0.16+git20110107+b795ca6e-0ubuntu7

I get a hard freeze with mouse cursor still working, and the box
normally still SSH-able, if I use:

KDE + Kwin
Gnome + Compiz
and using either nvidia-current (proprietary) or nouveau graphics driver.

Workaround is to use Gnome+Metacity.

Typical trace in Xorg log:
 24110.967] [mi] EQ overflowing. The server is probably stuck in an infinite loop.
[ 24110.967] 
Backtrace:
[ 24110.999] 0: /usr/bin/X (xorg_backtrace+0x26) [0x4a2626]
[ 24110.999] 1: /usr/bin/X (mieqEnqueue+0x1f4) [0x4a18e4]
[ 24110.999] 2: /usr/bin/X (xf86PostButtonEventM+0xaf) [0x47dccf]
[ 24110.999] 3: /usr/bin/X (xf86PostButtonEvent+0xdd) [0x47de9d]
[ 24110.999] 4: /usr/lib/xorg/modules/input/synaptics_drv.so (0x7f3152885000+0x4c81) [0x7f3152889c81]
[ 24110.999] 5: /usr/lib/xorg/modules/input/synaptics_drv.so (0x7f3152885000+0xb268) [0x7f3152890268]
[ 24110.999] 6: /usr/lib/libutouch-grail.so.1 (grail_pull+0x382) [0x7f31530a5342]
[ 24110.999] 7: /usr/lib/xorg/modules/input/synaptics_drv.so (0x7f3152885000+0xb034) [0x7f3152890034]
[ 24110.999] 8: /usr/lib/xorg/modules/input/synaptics_drv.so (0x7f3152885000+0x6d7e) [0x7f315288bd7e]
[ 24110.999] 9: /usr/bin/X (0x400000+0x6c657) [0x46c657]
[ 24110.999] 10: /usr/bin/X (0x400000+0x124bbe) [0x524bbe]
[ 24110.999] 11: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7f3159631000+0xfc60) [0x7f3159640c60]
[ 24110.999] 12: /lib/x86_64-linux-gnu/libc.so.6 (__select+0x13) [0x7f315863a123]
[ 24110.999] 13: /usr/bin/X (WaitForSomething+0x19b) [0x45c76b]
[ 24111.000] 14: /usr/bin/X (0x400000+0x2e032) [0x42e032]
[ 24111.000] 15: /usr/bin/X (0x400000+0x21a7e) [0x421a7e]
[ 24111.000] 16: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xff) [0x7f315857aeff]
[ 24111.000] 17: /usr/bin/X (0x400000+0x21629) [0x421629]

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https://bugs.launchpad.net/bugs/567696

Title:
  [Radeon] [Lucid] [mi] EQ overflowing. The server is probably stuck in
  an infinite loop