powernow0: set freq failed, err 6

I have repeating errors in /var/log/messages 

[PH34R] ~> tail -f /var/log/messages
Feb  1 23:34:34 PH34R kernel: powernow0: set freq failed, err 6
Feb  1 23:34:34 PH34R kernel: powernow1: set freq failed, err 6
Feb  1 23:34:34 PH34R kernel: powernow0: set freq failed, err 6
Feb  1 23:34:34 PH34R kernel: powernow1: set freq failed, err 6
Feb  1 23:34:34 PH34R kernel: powernow0: set freq failed, err 6
Feb  1 23:34:41 PH34R last message repeated 17 times

Now freq on my notebook is cut by about a half
dev.cpu.0.freq: 1194

I don't know is it connected, but it first strted when i installed linux 2.6.28 and rebooted from it.

Similiar problem here
   http://lists.freebsd.org/pipermail/freebsd-current/2008-December/001401.html
as i know Keda is using same hardware: notebook HP 6715s

dmesg attached