Server frozen

[Magnus Kessler]

With git HEAD of xserver, xf86-video-intel, mesa, libdrm, and the input 
drivers the X server does not seem to come back once the screen saver in KDE 
has kicked in and DPMS has turned off the display. This happens on both a 
laptop with the G45 and a desktop with the 965G graphic chips. The desktop 
environment is KDE-4.2.4. Both machines run the 2.6.30 kernel, but I had these 
errors under 2.6.29.4 as well recently, where the server would suddenly freeze 
with just the mouse pointer being reactive when using a 3D application 
(including kwin compositing manager). It is possible to log into the machine 
via ssh, but the server cannot be killed succesfully. Only a reboot brings the 
display back.

The end of the Xorg log shows this error:

[mi] EQ overflowing. The server is probably stuck in an infinite loop.

Backtrace:
0: /usr/bin/X(xorg_backtrace+0x28) [0x46e648]
1: /usr/bin/X(mieqEnqueue+0x1e4) [0x45daf4]
2: /usr/bin/X(xf86PostMotionEventP+0xd8) [0x471a58]
3: /usr/bin/X(xf86PostMotionEvent+0xa9) [0x471c19]
4: /usr/lib64/xorg/modules/input/synaptics_drv.so [0x7f5d127bb85e]
5: /usr/lib64/xorg/modules/input/synaptics_drv.so [0x7f5d127bdb58]
6: /usr/bin/X [0x47b587]
7: /usr/bin/X [0x5071ea]
8: /lib/libpthread.so.0 [0x7f5d173e6600]
9: /lib/libc.so.6(ioctl+0x7) [0x7f5d15111607]
10: /usr/lib/libdrm_intel.so.1(drm_intel_gem_bo_start_gtt_access+0x4d) 
[0x7f5d134c97dd]
11: /usr/lib64/dri/i965_dri.so(intelFinish+0x56) [0x7f5d12dd0226]
12: /usr/lib64/xorg/modules/extensions/libglx.so [0x7f5d141c160d]
13: /usr/lib64/xorg/modules/extensions/libglx.so [0x7f5d141c5aee]
14: /usr/bin/X [0x455bc4]
15: /usr/bin/X [0x425d65]
16: /lib/libc.so.6(__libc_start_main+0xfd) [0x7f5d15069a0d]
17: /usr/bin/X [0x4258f9]

The problem first appeared for me after the Xi2 code landed in the server. Has 
somebody else observed this bug? Which component is most likely to cause this? 
The intel driver, mesa or the server?

Many thanks for any pointers.

Magnus

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