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I've a Dell, with a Broadcom BCM4312 802.11b/g wireless card. It works well when the laptop is plugged to the power suply, but when it's with battery it doesn't work well.

Do you know why is this?

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closed as too localized by James Feb 28 '12 at 15:37

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

Does the wifi stop working or does it work badly? What is the output of sudo rfkill? does it show the wifi as switched off? – Martin Owens -doctormo- Feb 9 '11 at 15:12
I have this same problem. It only happens at one coffee shop. I can connect to the router, but on battery power websites will not load, or they load extremely slowly. This has only happened recently, however, so I assume their router configuration is involved. I have the BCM4321 card and rfkill doesn't show the wifi as switched off. – jamesadney Mar 17 '11 at 15:02
Hello, this question has no information and activity for a very long time. I am voting to close it for now. If by any reason you think this question is still viable or useful in anyways or that there is still a good chance it will be answered please flag it to a moderator or add a comment with the reasons why you want it open. Regards. – Nitin Venkatesh Feb 28 '12 at 15:37

pm-powersave helps your battery life by powering down stuff (including your wireless) when AC power goes away. See Why is wireless down/strange after switching to battery?

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b43 seems to not support power management (at least out of the box). Check this answer: Broadcom b43 power management. And, probably, this one: Dell Vostron hangs/freezes randomly after AC power or wifi swtiched off. Hope this helps.

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