On Sun, 2007-05-13 at 23:38 +0200, Martin Sourada wrote: > Martin Sourada wrote: > > Martin Sourada wrote: > >> > >> > >> Cool thing, just tried it on rawhide with the not-so-unexpected result > >> where the top is liferea and epiphany followed by usb, XOrg and > >> eth0.... But what I didn't expect was the power usage and count of > >> wakeups: > >> Wakeups-from-idle per second : 413.0 > >> Power usage (ACPI estimate) : 1.1 W (2.4 hours left) > >> > >> 1.1 W? That is really low IMO... Really, really interesting. Hope this > >> tool helps to improve linux powersaving capabilities in the future. > >> Keep the good work :-) > >> > >> Martin > >> > > > > I looked once more at the power usage: 1.1W... is it OK? Shouldn't there > > be 11W? I have quite ordinal laptop with Intel Celeron M 420, I don't > > think such low power usage is possible on this... Any idea? And well, I > > have the 1.1 version of PowerTOP. > > > > Thanks, > > Martin > > > > As kernel says: > # cat /proc/acpi/battery/BAT1/state > present: yes > capacity state: ok > charging state: discharging > present rate: 1212 mA > remaining capacity: 262 mAh > present voltage: 13759 mV > > the power usage should be around 16 W. Is it a bug in the PowerTOP, or is it > supposed to mean something different (currently it shows 1.2 W)? > It looks to me like it is using "present rate" which would be 1.2A forgetting that to calculate Watts you need to multiply the current(A) by voltage (V). A more reasonable answer would be... Power drain = 1.212A * 13.759V = 16.676W Jon -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
