Comment 4 for bug 775504

[ 4610.797] (II) Logitech USB Receiver: initialized for relative axes.
[ 4610.797] (WW) Logitech USB Receiver: ignoring absolute axes.
[ 4610.797] (**) Logitech USB Receiver: (accel) keeping acceleration scheme 1
[ 4610.797] (**) Logitech USB Receiver: (accel) acceleration profile 0
[ 4610.797] (**) Logitech USB Receiver: (accel) acceleration factor: 2.000
[ 4610.797] (**) Logitech USB Receiver: (accel) acceleration threshold: 4
[ 4610.797]
Backtrace:
[ 4610.814] 0: /usr/bin/X (xorg_backtrace+0x3b) [0x80eab1b]
[ 4610.814] 1: /usr/bin/X (0x8048000+0x5fac8) [0x80a7ac8]
[ 4610.814] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0x78a40c]
[ 4610.814] 3: /usr/bin/X (WakeupHandler+0x52) [0x8074602]
[ 4610.814] 4: /usr/bin/X (WaitForSomething+0x1ba) [0x80a1f3a]
[ 4610.815] 5: /usr/bin/X (0x8048000+0x27f1e) [0x806ff1e]
[ 4610.815] 6: /usr/bin/X (0x8048000+0x1a81c) [0x806281c]
[ 4610.815] 7: /lib/i386-linux-gnu/libc.so.6 (__libc_start_main+0xe7) [0x1e5e37]
[ 4610.815] 8: /usr/bin/X (0x8048000+0x1a411) [0x8062411]
[ 4610.815] Segmentation fault at address 0x1a6
[ 4610.815]
Caught signal 11 (Segmentation fault). Server aborting