On Wed, 2007-01-24 at 17:34 +0100, ext Frantisek Dufka wrote: > Karl Bellve wrote: > > Igor Stoppa wrote: > >> > >> Power saving is not so important when the _energy_ wasted is so little > >> and for an event which is supposed to happen very seldom (you don't turn > >> off your device, don't you?). > >> > > > > Every time it crashes! :-) > > > > When using the Nokia at night, while watching TV in a dark room, the > > nokia can be absurdly bright during its reboot process. So bright, I > > have to face the nokia down on the couch while it reboots. So, the > > bright light is over whelming when you have the nokia set to its dimmest > > level because your eyes have adjusted to the dark. > > > > Exactly. That is my second (and maybe bigger) concern. Reboot or crash > at night is not a pleasant thing. While it is supposed to happen very > seldom in reality it is not such rare event. And the backligh really > does not consume significant power? Check what i wrote, i wrote _energy_ and i'm gonna restate it: the energy wasted by the backlighing durinig a device boot sequence is not so much, when compared to other things that affect runtime power saving. Even 100 mA over less than 60 seconds are really nothing. Otoh 2 mA over few days are _a lot_ > 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. > But anyway is there some real reason while the default cannot be much > lower until device boots to the point where user specified setting is > honored? > > Frantisek No, just nobody so far had complained so much and from am effectiveness standpoint, it's irrelevant to power saving. -- Cheers, Igor Igor Stoppa <igor.stoppa at nokia.com> (Nokia M - OSSO /Helsinki Finland)
