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I have a Dell XPS 15 with dual boot windows 7 ultimate and Ubuntu 11.10 and the wireless connection is really bad on Ubuntu, I have 2-5mbps in Ubuntu and keep losing the connection for 5sec, but in windows I have 20mbps and its good and fast...

I have Intel Centrino wireless-N 1030

I have tried to turn Power Management to off and it got up to 7-10mbps so that helped now but i still keep losing the internet connection.

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Maybe you can try as suggested here; someone with the same wifi card has this problem and solved it switching off the power mode to the wifi:

iwconfig wlan0 | grep "Power Management" Power Management:off

If it’s set to “on” then there become my performance problems. To change it on runtime you just have to do :

sudo iwconfig wlan0 power off

If you, like me, want to set it always off then you can for example modify the script /usr/lib/pm-utils/power.d/wireless . I simply set this on line 39 (it's iwlagn) : iwconfig_batt="power off"

http://ubuntuforums.org/archive/index.php/t-1845983.html

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I tried all those information stuff that he did but when i did 'uname -mr' i got '3.0.0-14-generic-pae i686' instead of '2.6.38-11-generic x86_64' what he's getting. And i tried to set it to off and rebooted and didn't help :( –  Jeggy Jan 3 '12 at 17:19

I had problems with a centrino wlan chip, until I changed the settings for the interrupt in the bios. Maybe it doesn't solve your problem, but you could give it a try.

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