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I bought dell xps 15z and installed Ubuntu 11.10 on this laptop. Laptop and ubuntu liked me. But I have problem with battery life. In windows it can 4-5 hours, but in ubuntu it is not more 2 hours. Can I do something 8GB Ram , Intel i7, Nvidia Gt525 2Gb, ...

Thanks for helps


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flagged to be reopened pending answer from askubuntu.com/users/2638/brandon-bertelsen –  fossfreedom Jul 21 '12 at 8:30
    
Possible Duplicate askubuntu.com/questions/285434/… –  Qasim Jun 14 '13 at 14:51

3 Answers 3

Looks like some other users have had the same problems... http://ubuntuforums.org/showthread.php?t=1883714

tl;dr

It looks like the issue has been found. one of our user noticed that if you completely disable the Nouveau drivers and kernel module it resolves the problem. You can find out how here: https://wiki.ubuntu.com/X/Troublesho...abling_nouveau

and

you can also try following the instructions here and get Optimus working..

snippet

Optimus is an optimization technology created by Nvidia to save battery life by automatically switching the power of the graphics processing unit (GPU) off when it is not needed and switching it on when needed again, this is not supported by Nvidia in Linux but there are ways to get it working almost perfectly. This is how I got it working on my Dell XPS 15 L502x with GT540m.

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Unfortunately, a number of these links are dead. A good example of why information needs to be brought into askubuntu and referenced. –  Brandon Bertelsen Jul 21 '12 at 9:05

You can also try Jupiter, an aplett, which changes power saving settings beside regulating the CPU frequency.

Jupiter at webupd8

A lot of peaople gain savings up to 30%.

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This problem is specific to Nvidia Optimus laptops (Nvida 540m, in this case) and is fixed largely by the power management capabilities of bumblebee:

From: https://wiki.ubuntu.com/Bumblebee

For 12.04:

sudo add-apt-repository ppa:bumblebee/stable

For 11.04 and Older (10,9,8...etc)

sudo add-apt-repository ppa:ubuntu-x-swat/x-updates

Then:

sudo apt-get update
sudo apt-get install bumblebee bumblebee-nvidia     

Even without re-logging, I watched my battery time go from "1:25" to "3:10".

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