Comment 57 for bug 190414

This is a Dell Poweredge 2800, what I've also read is forcing the CPU to stay at full speed can stop it which would be a ok temporary solution for me as it's more important the server works, but seems that scaling isn't available in Server ? Either that or it's handled differntly fromt he scaling governors like it was before:

user@host-01:~$ sudo ls -l /sys/devices/system/cpu/cpu0/
total 0
-r-------- 1 root root 4096 2008-09-22 11:43 crash_notes
drwxr-xr-x 2 root root 0 2008-09-22 11:42 topology
user@host-01:~$ sudo ls -l /sys/devices/system/cpu/cpu0/topology/
total 0
-r--r--r-- 1 root root 4096 2008-09-22 11:43 core_id
-r--r--r-- 1 root root 4096 2008-09-22 11:42 core_siblings
-r--r--r-- 1 root root 4096 2008-09-22 11:43 physical_package_id
-r--r--r-- 1 root root 4096 2008-09-22 11:43 thread_siblings

I've set clocksource=acpi_pm at boot to see if starting out on it rather than switching from TSC solves the issue, I'll update as soon as I have info. Just to add this never occurs right after or during boot, it can take several hours to occur. I haven't spotted a pattern yet but I'll keep my eyes open.

Attached Dmesg with acpi_pm enabled in grub.