I also found the following messages in /var/log/messages
Aug 10 17:34:34 bavo kernel: [ 42.469329] hda-intel: Too big adjustment 32
Aug 10 17:34:34 bavo kernel: [ 42.533457] hda-intel: Too big adjustment 32
Aug 10 17:34:34 bavo kernel: [ 42.549331] hda-intel: Too big adjustment 32
Aug 10 17:34:34 bavo kernel: [ 42.617465] hda-intel: Too big adjustment 32
Aug 10 17:34:34 bavo kernel: [ 42.640358] hda-intel: Too big adjustment 32
Aug 10 17:34:34 bavo kernel: [ 90.000025] Clocksource tsc unstable (delta = -151174583 ns)
Aug 10 17:34:34 bavo kernel: [ 109.204275] gdmsetup[3374]: segfault at 0 ip 00cf4a98 sp bfe8b04c error 4 in libc-2.10.1.so[c82000+151000]
I also found the following messages in /var/log/messages
Aug 10 17:34:34 bavo kernel: [ 42.469329] hda-intel: Too big adjustment 32 10.1.so[ c82000+ 151000]
Aug 10 17:34:34 bavo kernel: [ 42.533457] hda-intel: Too big adjustment 32
Aug 10 17:34:34 bavo kernel: [ 42.549331] hda-intel: Too big adjustment 32
Aug 10 17:34:34 bavo kernel: [ 42.617465] hda-intel: Too big adjustment 32
Aug 10 17:34:34 bavo kernel: [ 42.640358] hda-intel: Too big adjustment 32
Aug 10 17:34:34 bavo kernel: [ 90.000025] Clocksource tsc unstable (delta = -151174583 ns)
Aug 10 17:34:34 bavo kernel: [ 109.204275] gdmsetup[3374]: segfault at 0 ip 00cf4a98 sp bfe8b04c error 4 in libc-2.