debugging sluggish CPU frequency transitions

Roberto Ragusa mail at
Thu Nov 13 10:23:36 UTC 2014

On 11/13/2014 04:52 AM, Timothy Redmond wrote:
> I have a Thinkpad W520 computer (4270CTO) and I am running Fedora 20 and keeping its packages up to date.  Often when I am working the cpu frequency transitions beautifully and the computer is very responsive. I have run some programs that take a long time (hours to days) and have watched the frequency go up when there is only one thread running and go down when there are several threads running. So it seems to be working very nicely.

My W520 (on F19) does not show this problem.
Have a look at system messages; there could be thermal related limits
which are enforced even if the load and preferences would like to
have a high speed.

   Roberto Ragusa    mail at

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