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.
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.