My wifi in ubuntu 11.10 so slow [closed]

how could I repair? I update Ubuntu 11.04 to ubuntu 11.10, Im new user, help me Thanks

Solution 1:

Since your description isn't very clear, this solution might or might not work.

On laptops, when on battery Ubuntu reduces the power given to the WiFi radio to save battery. There's a way to force Ubuntu to not make this change and instead give full power to the radio. To do this, run these command while on battery:

sudo iwconfig  

The output will be like this:

lo no wireless extensions.

eth0 no wireless extensions.

wlan0 IEEE 802.11bgn ESSID:"Network Wifi name"
Mode:Managed Frequency:2.457 GHz Access Point: 64:0F:28:1B:18:A9
Bit Rate=54 Mb/s Tx-Power=15 dBm
Retry long limit:7 RTS thr:off Fragment thr:off Power Management:on Link Quality=70/70 Signal level=-32 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:137 Missed beacon:0

As you can see, wlan0 seems to be the WiFi interface and Power management under it is set to ON. You can fix that by disabling power management on the radio with this command:

sudo iwconfig wlan0 power off

This should fix it. If not, then its probably a driver issue. I cannot pinpoint the issue well because of the lack of information in the question.