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I use a fresh install of Natty on a Eeepc with ION and nvidia-current driver. One time per week It happens that mouse and keyboard get blocked. I have to turn off the machine using the power button.
I think this is different from other bugs because I use nvidia-current driver and not noveau. But I found on google that this can happen with Intel cards, so maybe that it is not nvidia related. 

Here is the final part of Xorg.log founded after the crash:

[ 5811.027] [mi] EQ overflowing. The server is probably stuck in an infinite loop.
[ 5811.029]
Backtrace:
[ 5811.106] 0: /usr/bin/X (xorg_backtrace+0x3b) [0x80eab2b]
[ 5811.107] 1: /usr/bin/X (mieqEnqueue+0x1ab) [0x80e9d0b]
[ 5811.107] 2: /usr/bin/X (xf86PostMotionEventM+0xbf) [0x80c4b6f]
[ 5811.107] 3: /usr/bin/X (xf86PostMotionEvent+0x9a) [0x80c4d9a]
[ 5811.107] 4: /usr/lib/xorg/modules/input/synaptics_drv.so (0x97b000+0x4964) [0x97f964]
[ 5811.107] 5: /usr/lib/xorg/modules/input/synaptics_drv.so (0x97b000+0xad75) [0x985d75]
[ 5811.107] 6: /usr/lib/libutouch-grail.so.1 (grail_pull+0x2ec) [0xb573cc]
[ 5811.107] 7: /usr/lib/xorg/modules/input/synaptics_drv.so (0x97b000+0xab31) [0x985b31]
[ 5811.107] 8: /usr/lib/xorg/modules/input/synaptics_drv.so (0x97b000+0x6722) [0x981722]
[ 5811.108] 9: /usr/bin/X (0x8048000+0x6b41f) [0x80b341f]
[ 5811.108] 10: /usr/bin/X (0x8048000+0x12ddb6) [0x8175db6]
[ 5811.108] 11: (vdso) (__kernel_sigreturn+0x0) [0xe71400]

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

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Often xorg freezes with EQ overflowing
https://bugs.launchpad.net/bugs/792278
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