Anup,

I noticed in /etc/power.conf I have (default)
cpupm disable
Does that matter for the proper detection of power modes ?

I believe the acpi is supposed to support two modes:
630 and 900 MHz referred to as powersave and performance mode
based on other users running Linux on the same machine and
obvioulsy there are two distinct performance modes based on
run-time experiments on my laptop.

powertop shows:

   OpenSolaris PowerTOP version 1.1     (C) 2007 Intel Corporation

Cn                      Avg     residency       P-states (frequencies)
C0 (cpu running)                (47.5%)          900 Mhz        100.0%
C1                      2.6ms   (52.5%)

Wakeups-from-idle per second: 200.2     interval: 6.5s
no ACPI power usage estimate available

Top causes for wakeups:
50.0% (100.0)               <kernel> :  genunix`clock
39.3% ( 78.7)            <interrupt> :  uhci#1
21.5% ( 43.1)                  sched :  <scheduled timeout expiration>
13.8% ( 27.6)               <kernel> :  genunix`realitexpire
13.8% ( 27.6)            <interrupt> :  ath#0
 7.6% ( 15.2)                  xterm :  <scheduled timeout expiration>
 7.4% ( 14.7)               <kernel> :  uhci`uhci_handle_root_hub_status_change
 4.2% (  8.4)               <kernel> :  ata`ghd_timeout
 1.9% (  3.8)               <kernel> :  genunix`schedpaging
 1.8% (  3.7)               <kernel> :  ehci`ehci_handle_root_hub_status_change
 1.8% (  3.7)               <kernel> :  uhci`uhci_cmd_timeout

Thanks,

/Karl
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