https://bugs.freedesktop.org/show_bug.cgi?id=70388

--- Comment #17 from Rostislav Krasny <rosti.bsd-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
...and /var/log/kdm.log has the similar backtraces like it was in a past:


(EE) Backtrace:
(EE) 0: /usr/bin/X (mieqEnqueue+0x21b) [0x81d4adb]
(EE) 1: /usr/bin/X (QueuePointerEvents+0x6c) [0x8092f2c]
(EE) 2: /usr/bin/X (xf86PostMotionEventM+0x253) [0x80e0a93]
(EE) 3: /usr/lib/xorg/modules/input/evdev_drv.so (_init+0x31c7) [0xb70a5147]
(EE) 4: /usr/bin/X (DPMSSupported+0xc6) [0x80cff06]
(EE) 5: /usr/bin/X (xf86SerialModemClearBits+0x19b) [0x80fb54b]
(EE) 6: ? (?+0x19b) [0xb77bf59a]
(EE) 7: ? (?+0x19b) [0xb77bf5af]
(EE) 8: /lib/libc.so.6 (ioctl+0x19) [0xb7335989]
(EE) 9: /lib/libdrm.so.2 (drmIoctl+0x40) [0xb755dbf0]
(EE) 10: /lib/libdrm.so.2 (drmCommandWrite+0x3f) [0xb75604ff]
(EE) 11: /lib/libdrm_nouveau.so.2 (nouveau_bo_wait+0xa6) [0xb6d09146]
(EE) 12: /usr/lib/xorg/modules/drivers/nouveau_drv.so (_init+0x2019)
[0xb6d15cf9]
(EE) 13: /usr/lib/xorg/modules/libexa.so (exaMoveOutPixmap+0x6e2e) [0xb6cd48ae]
(EE) 14: /usr/bin/X (miFillUniqueSpanGroup+0x1adf) [0x81e65bf]
(EE) 15: /usr/bin/X (xf86I2CGetScreenBuses+0x1dfb) [0x81251ab]
(EE) 16: /usr/bin/X (dixDestroyPixmap+0x1ba9) [0x8078f79]
(EE) 17: /usr/bin/X (SendErrorToClient+0x3dd) [0x807aa5d]
(EE) 18: /usr/bin/X (_init+0x4665) [0x806c8c5]
(EE) 19: /lib/libc.so.6 (__libc_start_main+0xf3) [0xb7261963]
(EE) 20: /usr/bin/X (_start+0x21) [0x8068a5a]
(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 (mieqEnqueue+0xe8) [0x81d49a8]
(EE) 1: /usr/bin/X (QueuePointerEvents+0x6c) [0x8092f2c]
(EE) 2: /usr/bin/X (xf86PostMotionEventM+0x253) [0x80e0a93]
(EE) 3: /usr/lib/xorg/modules/input/evdev_drv.so (_init+0x31c7) [0xb70a5147]
(EE) 4: /usr/bin/X (DPMSSupported+0xc6) [0x80cff06]
(EE) 5: /usr/bin/X (xf86SerialModemClearBits+0x19b) [0x80fb54b]
(EE) 6: ? (?+0x19b) [0xb77bf59a]
(EE) 7: ? (?+0x19b) [0xb77bf5af]
(EE) 8: /lib/libc.so.6 (ioctl+0x19) [0xb7335989]
(EE) 9: /lib/libdrm.so.2 (drmIoctl+0x40) [0xb755dbf0]
(EE) 10: /lib/libdrm.so.2 (drmCommandWrite+0x3f) [0xb75604ff]
(EE) 11: /lib/libdrm_nouveau.so.2 (nouveau_bo_wait+0xa6) [0xb6d09146]
(EE) 12: /usr/lib/xorg/modules/drivers/nouveau_drv.so (_init+0x2019)
[0xb6d15cf9]
(EE) 13: /usr/lib/xorg/modules/libexa.so (exaMoveOutPixmap+0x6e2e) [0xb6cd48ae]
(EE) 14: /usr/bin/X (miFillUniqueSpanGroup+0x1adf) [0x81e65bf]
(EE) 15: /usr/bin/X (xf86I2CGetScreenBuses+0x1dfb) [0x81251ab]
(EE) 16: /usr/bin/X (dixDestroyPixmap+0x1ba9) [0x8078f79]
(EE) 17: /usr/bin/X (SendErrorToClient+0x3dd) [0x807aa5d]
(EE) 18: /usr/bin/X (_init+0x4665) [0x806c8c5]
(EE) 19: /lib/libc.so.6 (__libc_start_main+0xf3) [0xb7261963]
(EE) 20: /usr/bin/X (_start+0x21) [0x8068a5a]
(EE) 
(EE) [mi] EQ overflow continuing.  200 events have been dropped.

and so on...

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