View Full Version : [ubuntu] Clocksource tsc unstable

January 15th, 2009, 11:16 AM
I am trying to load ubuntu live cd and nothing happens after I hit start/install. I remove the quite splash thing and I see this message

Clocksource tsc unstable (delta = -299251584239ns)

what does that mean? I've been using the same cd for a while now and I know it works, plus I've installed ubuntu alot of times on my pc before using live cds.

I'm running
Asus M2a-VN Mobo
AMD Athlon X2 +3600 1.9Ghz
OCZ 2 GB RAM 800Mhz DDR2
Plenty of disk space available

I heard from someone that it means my bios battery is running low. Could that be it?

January 15th, 2009, 11:36 AM
Try adding clocksource=hpet as a boot option and see what happens. At the main menu press F6 and at the end of the line add

February 13th, 2009, 11:54 AM

id like to keep this on top hoping someone can help with this. ive been researching this problem for 3 days and cant seem to find a good solution to it.

im having random hang ups and after when the hang up is done, i check the log files and it would always come up as clocksource tsb unstable.

please help with this problem.

July 7th, 2009, 11:05 PM
what about adding the option clocksource=jiffies to the kernel lines in /boot/grub/menu.lst?

July 17th, 2009, 01:09 AM
this tread rocks the question!

January 12th, 2011, 09:30 AM
this tread rocks the question
I think you pasted the wrong link. It's about thunderbird.
I have a virtualized karmic and I get lot's of

/var/log/kern.log:Dec 26 07:10:28 webmail kernel: [ 615.503277] Clocksource tsc unstable (delta = -147977885 ns)
/var/log/kern.log:Dec 27 07:02:00 webmail kernel: [ 107.000842] Clocksource tsc unstable (delta = -139962943 ns)
/var/log/kern.log:Dec 28 07:03:41 webmail kernel: [ 208.502001] Clocksource tsc unstable (delta = -137181469 ns)
/var/log/kern.log:Jan 12 09:17:19 webmail kernel: [ 8.035751] Clocksource tsc unstable (delta = -94509445 ns)

Did any of you tested the boot options reported above?
Which one works?

February 4th, 2013, 07:51 PM
Hi dear community!

#Thanks to you I'm getting with linux better and better (sry for my English).
#INow it's my turn to contribute a little piece of solving this "Clocksource tsc #unstable".

I've got freezes just after system has booted and there were messages like

Marking TSC unstable due to cpu freq changes
Clocksource tsc unstable (delta = -96979.... ns)
in /var/log/syslog.

Adding "notsc clocksource=acpi_pm" to kernel parameters didn't help.

The solution for me was switching "AMD Cool'n'Quiet configuration" to "Disable" feature in BIOS.

Linux rocks!):P

February 4th, 2013, 10:20 PM
Old thread closed.