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#3 Some more research on power Posted by Utumno (61.229.xx.xx) on Tue 8 Apr 2008 at 18:44 Facts: 1) The laptop draws (with everything turned on and normal usage) about 16W of power. Powertop registers about 230 wakeups a second. 2) taking extreme measures ( switching wireless & bluetooth off, dimming the screen to the max, switching off compiz, rmmoding PCMCIA & firewire, disabling fan , mounting all partitions with noatime & nodiratime, increasing writeback time on my root partition to 15 seconds, following all other suggestions given by Powertop ) makes this go down to about 11 W ( the lowest momentarily draw I have ever seen was 10.5 W ) Powertop says there are about 65 wakeups per second. ( switching compiz off makes this go down from 230 to 130 but actually does NOT make a big difference in terms of power draw, rmmoding PCMCIA modules makes this go down from 130 to about 70 - isn't yenta misbehaving? ) 3) booting single-user ( no wireless & bluetooth, screen dimmed, no X ) actually draws about 13 W. Powertop reports only about 10 wakeups per second. 4) the very same laptop under Windows XP draws about 9.5 -10 W, and with everything set to 'conserve energy' mode, screen dimmed etc etc, I've seen even 8.11 W Conclusion: it's either Debian ( some Ubuntu users claim they achieve under 10 W ) or Linux power management plainly sucks.
Facts:
1) The laptop draws (with everything turned on and normal usage) about 16W of power. Powertop registers about 230 wakeups a second.
2) taking extreme measures ( switching wireless & bluetooth off, dimming the screen to the max, switching off compiz, rmmoding PCMCIA & firewire, disabling fan , mounting all partitions with noatime & nodiratime, increasing writeback time on my root partition to 15 seconds, following all other suggestions given by Powertop ) makes this go down to about 11 W ( the lowest momentarily draw I have ever seen was 10.5 W ) Powertop says there are about 65 wakeups per second. ( switching compiz off makes this go down from 230 to 130 but actually does NOT make a big difference in terms of power draw, rmmoding PCMCIA modules makes this go down from 130 to about 70 - isn't yenta misbehaving? )
3) booting single-user ( no wireless & bluetooth, screen dimmed, no X ) actually draws about 13 W. Powertop reports only about 10 wakeups per second.
4) the very same laptop under Windows XP draws about 9.5 -10 W, and with everything set to 'conserve energy' mode, screen dimmed etc etc, I've seen even 8.11 W
Conclusion: it's either Debian ( some Ubuntu users claim they achieve under 10 W ) or Linux power management plainly sucks.
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