[mi] EQ overflowing.  Additional events will be discarded until existing events are processed.

Backtrace:
0: /usr/bin/X (xorg_backtrace+0x49) [0xb77010b9]
1: /usr/bin/X (mieqEnqueue+0x213) [0xb76e1113]
2: /usr/bin/X (QueuePointerEvents+0x6d) [0xb75b51ad]
3: /usr/bin/X (xf86PostMotionEventM+0x24b) [0xb75ee84b]
4: /usr/bin/X (xf86PostMotionEvent+0xaa) [0xb75ee9aa]
5: /usr/lib/xorg/modules/input/synaptics_drv.so (0xb5420000+0x434d) [0xb542434d]
6: /usr/lib/xorg/modules/input/synaptics_drv.so (0xb5420000+0x5e81) [0xb5425e81]
7: /usr/bin/X (0xb7561000+0x7ce85) [0xb75dde85]
8: /usr/bin/X (0xb7561000+0xa7d5b) [0xb7608d5b]
9: (vdso) (__kernel_sigreturn+0x0) [0xb753e400]
10: /usr/bin/X (0xb7561000+0x1a4300) [0xb7705300]
11: (vdso) (__kernel_sigreturn+0x0) [0xb753e400]
12: (vdso) (__kernel_vsyscall+0x10) [0xb753e424]
13: /lib/i386-linux-gnu/libc.so.6 (ioctl+0x19) [0xb720cd09]
14: /usr/lib/i386-linux-gnu/libdrm.so.2 (drmIoctl+0x40) [0xb742f9e0]
15: /usr/lib/xorg/modules/drivers/intel_drv.so (0xb6b33000+0x5738a) [0xb6b8a38a]
16: /usr/lib/xorg/modules/drivers/intel_drv.so (0xb6b33000+0x57ec6) [0xb6b8aec6]
17: /usr/bin/X (xf86DPMSSet+0x6f) [0xb7617e8f]
18: /usr/bin/X (xf86SaveScreen+0x68) [0xb7617f88]
19: /usr/bin/X (dixSaveScreens+0x22d) [0xb75cec2d]
20: /usr/bin/X (mieqProcessInputEvents+0x170) [0xb76e16d0]
21: /usr/bin/X (ProcessInputEvents+0x14) [0xb75de024]
22: /usr/bin/X (0xb7561000+0x3c29c) [0xb759d29c]
23: /usr/bin/X (0xb7561000+0x2a52a) [0xb758b52a]
24: /lib/i386-linux-gnu/libc.so.6 (__libc_start_main+0xf5) [0xb713d905]
25: /usr/bin/X (0xb7561000+0x2a908) [0xb758b908]

[mi] These backtraces from mieqEnqueue may point to a culprit higher up the stack.
[mi] mieq is *NOT* the cause.  It is a victim.