[Bug 145377] Re: Powertop reports huge number of wakeups and drains battery

luminous blue variable nebelwand at gmail.com
Sat Nov 22 17:46:29 UTC 2008

Samsung NP-R20 notebook (Intel Core Duo T2350, ATI RS600ME+SB600
chipset, Radeon Xpress 1250 IGP, 2GB RAM), BIOS/MICOM 15SH

Full specs: http://www.samsungpc.com/gb/support/r20/specs/r20spec.pdf

Intrepid with kernel 2.6.27-7-generic 
Linux r20 2.6.27-7-generic #1 SMP Tue Nov 4 19:33:20 UTC 2008 i686 GNU/Linux

PowerTOP reports ~50000(!) wakeups-from-idle per second, while the six top causes for wakeups shown in the default view only add up to approx. 100. Avg residency for an idling system is ~60% "C0 (cpu running)", ~40% C2.

Adding the noapic kernel option results in only the aforementioned ~100
wakeups being listed, and ~99% C2. Cooling fan then alternates between
low and medium speed, while it never slows down without noapic.

** Attachment added: "lspci-vv.txt"

Powertop reports huge number of wakeups and drains battery
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