Talk:N900 Hardware Power Consumption

m (New page: who has created this? what about sources or describing test procedures? --~~~~)
(moved to discussion)
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who has created this? what about sources or describing test procedures? --[[User:ossipena|ossipena]] 08:01, 8 February 2010 (UTC)
who has created this? what about sources or describing test procedures? --[[User:ossipena|ossipena]] 08:01, 8 February 2010 (UTC)
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Moved the whole thing to discussion since that's where it belongs when it turns into a talk
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those values are moot - for the first 2 it's irrelevant which process is *idle* since the CPU should zeroclock anyway, alas here it's at fixed clock-freq which is NOT recommended. For the rest the only useful audio source to run those tests is a pink noise at 0dB. See `man sox` for how to create such file. Or to set volume to 1 step above zero, see above - so the whole music content becomes irrelevant. For arbitrary music the amplifier will introduce random "noise" up to 2000mW to the figures. The BQ24150 can't average out that noise. Further there's "GUI on" which means "backlight" and that's very random and even depending on ambient light, see 3 bullets above --[[User:joerg_rw|joerg_rw]] 12:52, 13 May 2015 (UTC)
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Not fixed, it's ondemand w/ bottom freqs allowed as specified.
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I restarted the same track every time, so the comparison should be quite  adequate, tho a noise would be better, yep. Also, where did you get the information regarding the bq24150 performance? Such spikes (if there are any) would be smoothed by the capacitors on the power lanes and then detected by bq24150, no? I didn't get any numbers on it from the datasheets tho.
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No backlight ofc.
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[[User:l29ah|l29ah]] 22:53, 14 May 2015 (UTC)
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When there's GUI ON then what's the meaning of that when there's no backlight?
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Generally those values over at main page are meant to be reproducable by others, otherwise they are useless. Neither a "GUI ON, BackLight Off" nor "always same (unknown) random music file" is reproducable by others.
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--[[User:joerg_rw|joerg_rw]] 03:33, 15 May 2015 (UTC)
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** idle @125MHz: 45mW T
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** idle @250MHz: 76mW T
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** mediaplayer mp3 playback, max volume, speakers: 415mW T
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** mediaplayer mp3 playback, max volume, headphones: 262mW T
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** openmediaplayer mp3 playback, max volume, headphones: 230mW T
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** mediabox mp3 playback, max volume, speakers: 463mW T
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** mediabox mp3 playback, max volume, headphones: 324mW T
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** oscp mp3 playback, 99% volume, gui on, speakers: 434mW T
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** oscp mp3 playback, 99% volume, gui on, headphones: 301mW T
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** oscp mp3 playback, 99% volume, gui off, headphones: 273mW T
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** oscp mp3 playback, ALSA, PA's mixer setup, 99% softvol, gui off, headphones: 195mW T

Revision as of 03:33, 15 May 2015

who has created this? what about sources or describing test procedures? --ossipena 08:01, 8 February 2010 (UTC)


Moved the whole thing to discussion since that's where it belongs when it turns into a talk 

those values are moot - for the first 2 it's irrelevant which process is *idle* since the CPU should zeroclock anyway, alas here it's at fixed clock-freq which is NOT recommended. For the rest the only useful audio source to run those tests is a pink noise at 0dB. See `man sox` for how to create such file. Or to set volume to 1 step above zero, see above - so the whole music content becomes irrelevant. For arbitrary music the amplifier will introduce random "noise" up to 2000mW to the figures. The BQ24150 can't average out that noise. Further there's "GUI on" which means "backlight" and that's very random and even depending on ambient light, see 3 bullets above --joerg_rw 12:52, 13 May 2015 (UTC)
Not fixed, it's ondemand w/ bottom freqs allowed as specified.
I restarted the same track every time, so the comparison should be quite  adequate, tho a noise would be better, yep. Also, where did you get the information regarding the bq24150 performance? Such spikes (if there are any) would be smoothed by the capacitors on the power lanes and then detected by bq24150, no? I didn't get any numbers on it from the datasheets tho.
No backlight ofc.
l29ah 22:53, 14 May 2015 (UTC)


When there's GUI ON then what's the meaning of that when there's no backlight? Generally those values over at main page are meant to be reproducable by others, otherwise they are useless. Neither a "GUI ON, BackLight Off" nor "always same (unknown) random music file" is reproducable by others. --joerg_rw 03:33, 15 May 2015 (UTC)

    • idle @125MHz: 45mW T
    • idle @250MHz: 76mW T
    • mediaplayer mp3 playback, max volume, speakers: 415mW T
    • mediaplayer mp3 playback, max volume, headphones: 262mW T
    • openmediaplayer mp3 playback, max volume, headphones: 230mW T
    • mediabox mp3 playback, max volume, speakers: 463mW T
    • mediabox mp3 playback, max volume, headphones: 324mW T
    • oscp mp3 playback, 99% volume, gui on, speakers: 434mW T
    • oscp mp3 playback, 99% volume, gui on, headphones: 301mW T
    • oscp mp3 playback, 99% volume, gui off, headphones: 273mW T
    • oscp mp3 playback, ALSA, PA's mixer setup, 99% softvol, gui off, headphones: 195mW T
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