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After I compiled and installed mir (trunk) and the most recent version
of the unity system compositor I got this weird log:

(EE) [mi] EQ overflowing.  Additional events will be discarded until existing events are processed.
(EE) 
(EE) Backtrace:
(EE) 0: /usr/bin/X (xorg_backtrace+0x49) [0xb76c01a9]
(EE) 1: /usr/bin/X (mieqEnqueue+0x213) [0xb76a0203]
(EE) 2: /usr/bin/X (QueuePointerEvents+0x6d) [0xb757418d]
(EE) 3: /usr/bin/X (xf86PostMotionEventM+0x24b) [0xb75ad82b]
(EE) 4: /usr/lib/xorg/modules/input/evdev_drv.so (0xb6ecb000+0x4726) [0xb6ecf726]
(EE) 5: /usr/bin/X (0xb7520000+0x7ce65) [0xb759ce65]
(EE) 6: /usr/bin/X (0xb7520000+0xa7d3b) [0xb75c7d3b]
(EE) 7: /lib/i386-linux-gnu/libpthread.so.0 (0xb73e6000+0xee48) [0xb73f4e48]
(EE) 8: /lib/ld-linux.so.2 (0xb74fe000+0x1172) [0xb74ff172]
(EE) 9: /lib/i386-linux-gnu/libpthread.so.0 (pthread_cond_wait+0xdb) [0xb73f084b]
(EE) 10: /usr/lib/i386-linux-gnu/libstdc++.so.6 (_ZNSt18condition_variable4waitERSt11unique_lockISt5mutexE+0x25) [0xb6c812d5]
(EE) 11: /usr/lib/i386-linux-gnu/libmirclient.so.2 (_ZN13MirWaitHandle12wait_for_allEv+0x5f) [0xb6e6e80f]
(EE) 12: /usr/lib/i386-linux-gnu/libmirclient.so.2 (mir_wait_for+0x1f) [0xb6e6a54f]
(EE) 13: /usr/lib/xorg/modules/extensions/libxmir.so (xmir_auth_drm_magic+0x3f) [0xb74f5b5f]
(EE) 14: /usr/lib/xorg/modules/drivers/intel_drv.so (0xb60b9000+0xca677) [0xb6183677]
(EE) 15: /usr/bin/X (DRI2Authenticate+0x5c) [0xb76912cc]
(EE) 16: /usr/bin/X (0xb7520000+0x17209b) [0xb769209b]
(EE) 17: /usr/bin/X (0xb7520000+0x3c46d) [0xb755c46d]
(EE) 18: /usr/bin/X (0xb7520000+0x2a50a) [0xb754a50a]
(EE) 19: /lib/i386-linux-gnu/libc.so.6 (__libc_start_main+0xf5) [0xb70ea905]
(EE) 20: /usr/bin/X (0xb7520000+0x2a8e8) [0xb754a8e8]
(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.

...

[mi] EQ overflow continuing.  1000 events have been dropped.
(EE) [mi] No further overflow reports will be reported until the clog is cleared.

** Affects: mir
     Importance: Medium
         Status: Confirmed

** Affects: xorg-server (Ubuntu)
     Importance: Medium
         Status: Confirmed


** Tags: xmir
-- 
[Xmir] EQ overflowing
https://bugs.launchpad.net/bugs/1221234
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