Comment 3 for bug 61746

I'm seeing this on a Dell Inspiron 4100 with an ATI Mobility M6.

The backtrace from the Xorg.0.log is as follows:

ProcXCloseDevice to close or not ?

Backtrace:
0: /usr/X11R6/bin/X(xf86SigHandler+0x81) [0x80c38e1]
1: [0xffffe420]
2: /lib/tls/i686/cmov/libc.so.6(__strtoul_internal+0x3f) [0xb7d9c7cf]
3: /usr/X11R6/bin/X [0x80e5997]
4: /usr/X11R6/bin/X(xf86HandlePMEvents+0x3b) [0x80d25bb]
5: /usr/X11R6/bin/X(xf86Wakeup+0x153) [0x80c4d93]
6: /usr/X11R6/bin/X(WakeupHandler+0x59) [0x808a599]
7: /usr/X11R6/bin/X(WaitForSomething+0x1b9) [0x81943d9]
8: /usr/X11R6/bin/X(Dispatch+0x82) [0x8086802]
9: /usr/X11R6/bin/X(main+0x485) [0x806e715]
10: /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xdc) [0xb7d848cc]
11: /usr/X11R6/bin/X(FontFileCompleteXLFD+0xa1) [0x806da51]

Fatal server error:
Caught signal 11. Server aborting

Killing acpid is the only workaround I've found.