I have exactly the same problem on my inspiron 1720 (core2duo) under ubuntu hardy 8.04 :
dmesg | grep "Clocksource" [ 23.987505] Clocksource tsc unstable (delta = -26370003969 ns)
cat /proc/version Linux version 2.6.24-18-rt (buildd@terranova) (gcc version 4.2.3 (Ubuntu 4.2.3-2ubuntu7)) #1 SMP PREEMPT RT Wed May 28 23:38:58 UTC 2008
I have exactly the same problem on my inspiron 1720 (core2duo) under ubuntu hardy 8.04 :
dmesg | grep "Clocksource"
[ 23.987505] Clocksource tsc unstable (delta = -26370003969 ns)
cat /proc/version
Linux version 2.6.24-18-rt (buildd@terranova) (gcc version 4.2.3 (Ubuntu 4.2.3-2ubuntu7)) #1 SMP PREEMPT RT Wed May 28 23:38:58 UTC 2008