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I installed Linux Mint 12(lisa) on my dell lx502 i.e. XPS 15 with an i7-670QM cpu and the nvidia 550M with optimus.

However I am concerned about the power consumption. About 21% battery ~= 36 minutes, while this is double in Windows 7 (with aero on). I've installed Jupiter, but does not seem to help a lot. My screen brightness is set to minimum.

My question is how I can make it be a little more power efficient and achieve similar battery performance like windows - 5.5Hrs on a 9 cell battery.

ren@zeus ~ $ uname -a
Linux zeus 3.0.0-12-generic #20-Ubuntu SMP Fri Oct 7 14:56:25 UTC 2011 x86_64 x86_64 x86_64 GNU/Li
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I assume this problem is tied to the optimus chip, are you running intel or nvidia drivers? –  Baarn Mar 27 '12 at 18:52
    
no, I haven't installed the nvidia drivers. I guess it has picked up some default drivers like vesa.. not sure. –  ren Mar 27 '12 at 18:56
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2 Answers

You can install and run powertop which advises on what kernel parameters to change. It will merely run through guidelines of Lesswatts. Also try OpenSUSE live CD – if it has better results, as it has radically different PM mechanism.

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I'll give powertop a go, I've installed the nvidia drivers as well, I think it might help will keep you posted. –  ren Mar 27 '12 at 20:42
    
Also try ubuntu with LXDE (lubuntu) - it is designed for underpowered computers, and will draw less power on your s (mine is like 5 years old and it is (OpenSUSE 64bit) KDE - 30W -> LXDE - 22W using idle desktop –  ZaB Mar 27 '12 at 21:41
    
well my computer is not underpowered :( –  ren Mar 29 '12 at 16:31
    
I don't like LXDE :( –  ren Mar 29 '12 at 16:31
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Make sure you have the latest bios update. I know I had an issue with Mint on my Acer laptop where I could not see the battery level. Looking on forums I could not figure it out. Finally I decide to update the BIOS and low and behold I was able to see the battery percentage. Getting drivers from the DELL website that are native linux may also help. Good luck!

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