how could I repair? I update Ubuntu 11.04 to ubuntu 11.10, Im new user, help me Thanks
closed as not a real question by Marco Ceppi♦ Oct 16 '11 at 18:17
It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, see the FAQ.
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:
The output will be like this:
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:
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.