http://bugzilla.kernel.org/show_bug.cgi?id=3406
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------- Comment #15 from [EMAIL PROTECTED] 2007-06-18 14:34 -------
There seems to be more with this issue: disabling the C3 state might not be
necessary.
In my configuration, I also get the noise, and indeed disabling the C3 state
stops the noise (on 2.6.18, modprobe -r processor && modprobe processor
max_cstate=2 , and no noise).
But, when C3 is enabled, there is a way to make the noise away without causing
much extra processor activity: I start playing music, and then pause. The noise
is away (as long as the player is paused, not closed).
With noise I have roughly the following CPU states usage (shown by powertop):
C0:10% C1:0% C2:34% C3:56%;
without noise when the player is paused it's:
C0:11% C1:0% C2:35% C3:54%.
This indicates that the usage of the C3 state is roughly the same, even when
the noise is away, doesn't it?
Perhaps, some change in the audio device state makes the difference.
(Also, I checked that there is no noise in Windows.)
So, perhaps this information from me will be useful for someone.
(And I wonder does disabling the C3 state increases power consumption?)
My computer is Dell Latitude D610,
processor: Intel(R) Pentium(R) M processor 2.00GHz,
Host bridge: Intel Corporation Mobile 915GM/PM/GMS/910GML Express Processor to
DRAM Controller (rev 03),
Multimedia audio controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6
Family) AC'97 Audio Controller (rev 03);
2.6.18 kernel, snd_intel8x0 from ALSA 1.0.14.
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