Igor Stoppa wrote:
I thought it can be half of power
consumption on such devices. It was like that on ipaq 3870 I had. I
remeber something like 80mA when display off ~130mA minimum brightness
~200mA full brightness, ~300mA full brightness + 100%CPU (not sure about
exact values, it is long time ago, it was available as file in /proc in
Familiar linux). On N770 I cannot check easily since some parts of power
management is ... guess what? There is this myth about hidden power
management ;-)
Nothinig prevents you from creating a sysfs entry wich returns
tahvo_get_backlight_level()
or even a proc one, if you really are into that sort of thing.
There is such entry - /sys/devices/platform/omapfb/panel/backlight_level
I meant way to get discharge current from battery circuit to know what
is actual consumption of the device and how big is the influence of
various parts. This is easy to get on laptops and it was possible on
iPAQ but is currently kept very close to Nokia's chest. Yes one can
measure it but it would need some tools, reading some register is much
easier. Would be also good guide for programmers implementing proper
idle state.
I would be interested in difference betwen SD/MMC vs internal flash I/O
(i.e. how does rootfs on MMC affect battery life) but other things are
equally interesting to know (wlan transmit/receive, sound, DSP on, DSP
vs main CPU doing similar stuff ...).
Frantisek
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