I have an acer 5742G laptop with the Nvidia 540M graphics card. After I upgraded to 11.04 I have been experiencing serious battery and overheating issue. Up until 10.10 I was able to put this thing on my lap and use it for straight 3 hours maximum. But now it has been reduced to half. Power top shows I am using 20-24W power, while previously it never exceeded 15W. I presume the reason is something to do with Nvidia graphics card. I had not installed anything for the graphics card in 10.10 but did so in 11.04 right after the install. How do I totally turn off the whole thing and be sure my graphics card is not using any power. I got that card just to play games and that I do on windows, most the compiling I need is done at a good rate by my i3 processor and most of the time I am browsing and checking email. I do not need that graphics card to do anything. If this mean I have to downgrade to Ubuntu classic or Unity 2D that would not be a problem.
Another thing is powersave usually gives this
The program 'rs:main Q:Reg' is writing to file 'syslog' on /dev/sda7. This prevents the disk from going to powersave mode.
Is there a solution to this?
Please tell how to I make sure my graphics card does not receive any power.