I just took a quick look on Antonello's laptop...
After resume in poll-mode, it does indeed seem to be staying at the top
speed. PowerTOP reflects ~ 85% of CPU time being spent in C1 vs. C0,
which seems to be true both before and after the resume. Prior to the
resume, poll-mode CPUPM works as expected.
In the default (event) mode on this system, I'm seeing the issue tracked
by:
6818514 Event based CPU power management can sometimes auto-tune too
conservatively
..but once that tuning is fixed the system power manages the CPUs as
expected (even after resume).
-Eric
Mark Haywood wrote:
Antonello Cruz wrote:
Mark Haywood wrote:
Antonello Cruz wrote:
Aubrey Li wrote:
On Tue, Apr 28, 2009 at 3:05 AM, Henrik Johansson
<[email protected]> wrote:
My power management works fine when I first boot my Lenovo T61,
but after
putting it into suspend mode it will always run on the highest
frequency.
I see the same behavior with a Dell XPS 1330M
I've notice that if I disconnect the power adapter and then
reconnect, it goes to a more same behavior.
So that I can do some investigation ... I assume you are running
CPUPM in poll-mode?
That's right, I've attached my power.conf file
Since I cannot type (apparently) here is what happens:
If I suspend/resume, after resume powertop report max P-state
(2001Mhz(turbo) 100%) and it seems the system is stuck at that cpu
frequency. This is confirmed with
kstat -m cpu_info -s current_clock_Hz
If I unplug the power supply, the cpu frequency drops to 800MHz. When
I plug the power supply back in, the frequency goes up to 2001Mhz and
gradually goes down to 800MHz again. Frequencies in all steps are
confirmed with
kstat -m cpu_info -s current_clock_Hz
Folks really ought to use powertop instead of the current_clock_Hz
kstat now. Unfortunately, I think current_clock_Hz will be a confusing
kstat now that PAD has integrated. You might still see that you are
not leaving the 2001MHz P-state, but I would verify with
/usr/bin/powertop.
Thanks,
Mark
Antonello
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