[Bug 399352] [NEW] max_cstate kernel option not preserved after hibernate/resume

David Hugh-Jones davidhughjones at gmail.com
Tue Jul 14 15:43:11 UTC 2009

Public bug reported:

I have added "processor.max_cstate=3" to my default grub options, in
order to try and fix the issue described here:


After first boot, everything works fine, and
/proc/acpi/processor/CPU0/power and /proc/acpi/processor/CPU1/power
both report max_cstate: 3. But after hibernating and resuming, they
report max_cstate: 8 and my thinkpad X60 starts whining again.

dave at dave-laptop:~$ uname -a
Linux dave-laptop 2.6.28-13-generic #45-Ubuntu SMP Tue Jun 30 19:49:51 UTC 2009 i686 GNU/Linux

dave at dave-laptop:~$ cat /proc/version_signature 
Ubuntu 2.6.28-13.45-generic

** Affects: linux-meta (Ubuntu)
     Importance: Undecided
         Status: New

max_cstate kernel option not preserved after hibernate/resume
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