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[Alexey Spiridonov <snarkmaster@xxxxxxxxx>]

My symptoms match Barney's exactly: slow mouse, usually happens after
suspend, CPU pegged. Alt-SysRq works to reboot, so it's definitely just
the X server getting stuck. It's not a hard kernel crash.

I have an ATI Mobiliy M300 on a Dell Inspiron 6000.

Here's a backtrace?

(II) RADEON(0): Output: VGA-0, Detected Monitor Type: 0
(II) RADEON(0): Output: LVDS, Detected Monitor Type: 2
(II) RADEON(0): Added native panel mode: 1920x1200
(II) RADEON(0): Output: S-video, Detected Monitor Type: 0
disable LVDS
disable LVDS
enable LVDS
[mi] EQ overflowing. The server is probably stuck in an infinite loop.

Backtrace:
0: /usr/bin/X (xorg_backtrace+0x3b) [0x80e937b]
1: /usr/bin/X (mieqEnqueue+0x1ab) [0x80e8b6b]
2: /usr/bin/X (xf86PostMotionEventP+0xd2) [0x80c2d02]
3: /usr/bin/X (xf86PostMotionEvent+0x68) [0x80c2e88]
4: /usr/lib/xorg/modules/input/synaptics_drv.so (0x350000+0x3603) [0x353603]
5: /usr/lib/xorg/modules/input/synaptics_drv.so (0x350000+0x5e3d) [0x355e3d]
6: /usr/bin/X (0x8048000+0x6d5bf) [0x80b55bf]
7: /usr/bin/X (0x8048000+0x122744) [0x816a744]
8: (vdso) (__kernel_sigreturn+0x0) [0xe42400]
9: /lib/libdrm.so.2 (drmCommandNone+0x32) [0xd1b162]
10: /usr/lib/xorg/modules/drivers/radeon_drv.so (0x224000+0xa240c) [0x2c640c]
11: /usr/lib/xorg/modules/libexa.so (0x9d9000+0x47f8) [0x9dd7f8]
12: /usr/lib/xorg/modules/libexa.so (0x9d9000+0x4da6) [0x9ddda6]
13: /usr/lib/xorg/modules/libexa.so (0x9d9000+0x4ef3) [0x9ddef3]
14: /usr/lib/xorg/modules/libexa.so (exaMoveOutPixmap+0x48) [0x9db298]
15: /usr/lib/xorg/modules/libexa.so (0x9d9000+0x44f1) [0x9dd4f1]
16: /usr/lib/xorg/modules/libexa.so (0x9d9000+0xb09e) [0x9e409e]
17: /usr/lib/xorg/modules/libexa.so (exaOffscreenAlloc+0x2c4) [0x9e4a04]
18: /usr/lib/xorg/modules/libexa.so (0x9d9000+0x4cc4) [0x9ddcc4]
19: /usr/lib/xorg/modules/libexa.so (0x9d9000+0x55ea) [0x9de5ea]
20: /usr/lib/xorg/modules/libexa.so (0x9d9000+0x2369) [0x9db369]
21: /usr/lib/xorg/modules/libexa.so (0x9d9000+0xa2c7) [0x9e32c7]
22: /usr/lib/xorg/modules/libexa.so (0x9d9000+0xa8ca) [0x9e38ca]
23: /usr/bin/X (0x8048000+0xd8bb8) [0x8120bb8]
24: /usr/bin/X (CompositeGlyphs+0xa5) [0x81b9a25]
25: /usr/bin/X (0x8048000+0xd2cbf) [0x811acbf]
26: /usr/bin/X (0x8048000+0xce9d3) [0x81169d3]   
27: /usr/bin/X (0x8048000+0x2a477) [0x8072477]
28: /usr/bin/X (0x8048000+0x1ed7a) [0x8066d7a]
29: /lib/tls/i686/cmov/libc.so.6 (__libc_start_main+0xe6) [0x652bd6]
30: /usr/bin/X (0x8048000+0x1e961) [0x8066961]

-- 
[Radeon] [Lucid] [mi] EQ overflowing. The server is probably stuck in an infinite loop
https://bugs.launchpad.net/bugs/567696
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