Most likely the backlight is set to 100%, thats what needs much more power. Brighness is not controlled via backlight by default. I would disable compiz too.
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Ubuntu 10.04 Is More Power Hungry Than Windows 7
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Do note that Ubuntu boots into performance and reverts to ondemand after 60 seconds or so. This is done to improve boot times and does impact power consumption.
(I disabled this feature today in favor of using the "conservative" governor everywhere. My mobile Core 2 doesn't really need the extra performance to boot).
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a bit to generous headline for the article
you test a netbook and use also one of the few ion-versions. Thats not very representive because there is no good open nvidia driver, and the closedsource drivers all consume to much energie. Use a Netbook with intel grafics or use a small notebook with integrated ati hardware, thats representative.
That Nvidia is the worst grafics solution for linux do we all now. Call it with nividia grafics + ubuntu linux is more power hungry than it is fair. Or alternativly test at least one of each other grafic-chip vendors.
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Originally posted by BlackStar View PostI disabled this feature today in favor of using the "conservative" governor everywhere. My mobile Core 2 doesn't really need the extra performance to boot).
Modern processors save the most power when they have long periods of inactivity as they can then spend longer in deeper C-states. By slowing the processor down, you are requiring that it take longer to complete its work and therefore spend more time dissipating more power.
[1] http://mjg59.livejournal.com/88608.html
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Sorry, but is there nobody who finds the results of the test a little bit strange?
To refresh your memories, the raw numbers from the test :
Code:Netbook 25W, 39W, 20W, 33W (W7,Ubuntu,W7,Ubuntu) T61 28W, 32W, 24W, 25W (W7,Ubuntu,W7,Ubuntu) Diff. -3W, 7W, -4W, 8W
The only explanation is that the power-meter, used in the test, does not work correctly with the netbook battery-charger.
Please Michael, check your numbers before writing an such an article.
P.S. :
I've just checked my own notebook (Dell Latitude D505, P-M 1.7Ghz, Linux-PHC-patched kernel) with a power-meter (No-name brand, bought at ALDI South, Germany) :
Code:Low Brightness, 600Mhz (Idle) -> ~15W Low Brightness, 1700Mhz (Idle) -> ~16W Low Brightness, 1700Mhz (CPUburn) -> ~25W High Brightness, 600Mhz (Idle) -> ~21W High Brightness, 1700Mhz (Idle) -> ~22W High Brightness, 1700Mhz (CPUburn) -> ~30W
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Same here. A Thinpad R61p with NVidia Quadro FX 570M and Core2Duo [email protected] consumes ~28-30Watt in idle mode at full brightness, ~32Watt on full hd playback in cpu mode, ~34Watt on full hd playback in gpu mode. I do not know the full power consumption, but it was something like 50Watt. It's allways less than with windows.
The second meaningless windows 7 and ubuntu comparison.
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Originally posted by phoronix View PostPhoronix: Ubuntu 10.04 Is More Power Hungry Than Windows 7
Yesterday we published our first benchmarks of Windows 7 vs. Ubuntu 10.04 that provided an initial look at the OpenGL graphics performance between these two operating systems on six different systems. Today we are continuing to compare the two operating systems as we look at the power consumption of Ubuntu and Windows on a netbook and notebook.
http://www.phoronix.com/vr.php?view=14893
A third party review would be really well received as it would give a fresh perspective.
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Originally posted by ebird View PostThe second meaningless windows 7 and ubuntu comparison.
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I would love to see a Windows 7 vs Ubuntu 10.04 vs EB4 power management / battery life test. The latest EB4 bets can be downloaded from the Eeebuntu website.
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