hirakendu das wrote:
Hi.
I am having a (not so) funny kind of issue. The issue seems that my
CPU seems to enter into a bad 'state', where even in idle it is in C0
for 2/3rds of the time. In this state, the interrupts per second go to
more than 20K per second!!
I have the same issue, although mine has seemed to get better since I
got my hda_intel audio configured properly. I was going into the "bad"
state and the CPU was waking up ~16000/sec. Currently my "bad" state is
running about 2400 wakeups per second. When it's in the good state
(usually right after a reboot) my wakeups are about 50. I'm running
Slackware 12 with custom compiled kernels 2.6.21.6 and 2.6.22.1 on a
Toshiba A135-S4427 Core Duo T2250 with ipw3945.
About power usage - in the bad state, my power usage is at an
estimated ~75W and in good state, about 55W. BTW, its a 6600 mAh,
14800 mV battery ( cat /proc/acpi/battery/BAT1/info), i.e., 98 Watt
hours, and at a rate of 65W, it lasts for just about an hour and a
half. The battery runs for less than 2 hrs in windows and just about
an hour and a half in linux. (This is with all devices running, low
brightness and browsing with firefox with mp3 music running in
background.)
I think these power estimates have to be taken with a grain of salt. My
battery is spec'd as a 4000mAh 14800mV. My consumption rate in powertop
is coming in at 20-25 watts and my battery is lasting approximately 2
hours. I haven't yet correlated the wakeup rate to battery life.
We really need to figure out what these "hidden" wakeups are.
I'm pretty excited that my A135 battery life is at least as good as the
Vista install that came on it. Once we figure out this out of control
wakeup thing I'll be real happy.
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