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raghavsetu you are DA MAN!

I fought with slow wireless in Ubuntu 12.04 with a BCM4322 for months! I tried everything; disabled ipv6, iwlwifi 11ndisable=1, rfkill unblock all, iwconfig eth2 power...

Making a Dummy with no OS worked for me too, 100% CPU goes down to 1%.

Run it as root by typing

gksudo nvidia-settings

Don't buy only the 65W adapter!


Unfortunately, I opted for the slim 65W travel adapter for use at home since I already had a 90W one at work.

Anytime the 65W adapter is plugged in, the BIOS...

I found out that the Dell BIOS limits the frequency to 800 MHz when the 65W travel adapter is used. Apparently this is to prevent underpowering of the discrete (not integrated) graphics card.
...

I'm having the same problem with 8.10 (Ibex) on a Dell Latitude E6400 with Intel Core 2 Duo T9400 @ 2.53GHz.

If I plug in a 90W adapter then frequency scaling works;
cat...