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[Marco Cimmino <cimmino.marco@xxxxxxxxx>]

I don't think this is a nvidia graphic drivers bug, as I have the same exact trace but using Intel drivers and Kubuntu 11.04 attaching my X log, to note:
[   263.547] [mi] EQ overflowing. The server is probably stuck in an infinite loop.
[   263.547] 
Backtrace:
[   263.547] 0: /usr/bin/X (xorg_backtrace+0x3b) [0x80eab1b]
[   263.547] 1: /usr/bin/X (mieqEnqueue+0x1ab) [0x80e9cfb]
[   263.547] 2: /usr/bin/X (xf86PostMotionEventM+0xbf) [0x80c4b5f]
[   263.547] 3: /usr/lib/xorg/modules/input/evdev_drv.so (0x210000+0x368f) [0x21368f]
[   263.547] 4: /usr/lib/xorg/modules/input/evdev_drv.so (0x210000+0x54e9) [0x2154e9]
[   263.547] 5: /usr/lib/xorg/modules/input/evdev_drv.so (0x210000+0x5d4d) [0x215d4d]
[   263.547] 6: /usr/bin/X (0x8048000+0x6b40f) [0x80b340f]
[   263.547] 7: /usr/bin/X (0x8048000+0x12ddb6) [0x8175db6]
[   263.547] 8: (vdso) (__kernel_sigreturn+0x0) [0x4d1400]
[   263.548] 9: /lib/i386-linux-gnu/libdrm_intel.so.1 (0xa8b000+0x4c3e) [0xa8fc3e]
[   263.548] 10: /lib/i386-linux-gnu/libdrm_intel.so.1 (drm_intel_bo_mrb_exec+0x40) [0xa8c650]
[   263.548] 11: /usr/lib/xorg/modules/drivers/intel_drv.so (0x223000+0x7339) [0x22a339]
[   263.548] 12: /usr/lib/xorg/modules/drivers/intel_drv.so (0x223000+0xda57) [0x230a57]
[   263.548] 13: /usr/lib/xorg/modules/drivers/intel_drv.so (0x223000+0xed6b) [0x231d6b]
[   263.548] 14: /usr/lib/xorg/modules/drivers/intel_drv.so (0x223000+0x2c1ee) [0x24f1ee]
[   263.548] 15: /usr/bin/X (CompositeRects+0x78) [0x811cb48]
[   263.548] 16: /usr/bin/X (0x8048000+0xd8de0) [0x8120de0]
[   263.548] 17: /usr/bin/X (0x8048000+0xd5183) [0x811d183]
[   263.548] 18: /usr/bin/X (0x8048000+0x28167) [0x8070167]
[   263.548] 19: /usr/bin/X (0x8048000+0x1a81c) [0x806281c]
[   263.548] 20: /lib/i386-linux-gnu/libc.so.6 (__libc_start_main+0xe7) [0x5e6e37]
[   263.548] 21: /usr/bin/X (0x8048000+0x1a411) [0x8062411]


** Attachment added: "Xorg.0.log.old"
   https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers/+bug/718858/+attachment/2096539/+files/Xorg.0.log.old

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https://bugs.launchpad.net/bugs/718858

Title:
  GPU hang using GL on x86_64