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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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    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, 2011 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, 2011 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, 2012 at 15:37

2 Answers 2

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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 or closing/opening the lid?

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b43 seems to not support power management (at least out of the box). Check this answer: https://askubuntu.com/questions/76310/broadcom-b43-power-management/81634#81634. And, probably, this one: Dell Vostro hangs/freezes randomly after AC power or wifi swtiched off. Hope this helps.

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