sony-vaio-z-series team mailing list archive

[dump@xxxxxxxx]

On 6/14/2010 8:51 PM, dump@xxxxxxxx wrote:
> I noticed that even with zero CPU usage, using the intel card, the Z11
> is much warmer and use up the battery much quicker in Linux than Windows 7.
> I suppose its some ACPI setting or CPU "idle bits" or something like
> that not functioning properly. I have all the i7 cooling stuff compiled
> in tho.
>
> (i7 620M)
> Linux fully idle core1 and 2: 64C
>
> Windows 7 fully idle core 1: 45C core 2: 50C
>
> Same room same day and on Windows the fan run a lot slower than on Linux
>
> Any idea or similar experience?
>
> Thanks
>    

Replying to myself and others at the same time:

- nvidia card didn't disable correctly as I though it was
- cpu freq changed to conservative stays at 1.1ghz according to i7z, on 
demand was waking them up all the time and...
- this is caused by knotify4 with sound alert enabled, apparently a 
widely known but not yet fixed bug
- knotify4 also causes the hdd to wake up a zillion time per second so i 
disabled sound notifications

end result fully idle:
windows  45-50C
linux 40-41C (never had it so "cold" - external temp is 22C !)
+1H battery life according to powertop and 99.5% time spent into C3 state

cool :)