I have Kubuntu 11.04 amd 64 installed with Broadcom STA wireless driver. When my HP Pavillion dv9925nr laptop is plugged into the AC adapter the wireless works fine. But if I'm running on battery power for even a short time the wireless disconnects and becomes disabled. Even after plugging it back in I cannot enable the wireless without rebooting with the AC adapter plugged in. I'm not talking about a low battery situation, normally when I notice the wireless is no longer available the battery is still in the high 90s.
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Re: Wireless becomes disabled when on battery power
Is it maybe a BIOS setting or an option in the Power Management? -
Re: Wireless becomes disabled when on battery power
I do not see anything in the BIOS settings or Kubuntu Power Manager that address this issue. Is there somewhere else I might look?Comment
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Re: Wireless becomes disabled when on battery power
I've tried creating new power management profiles to use when the AC is unplugged to no avail. Experimenting with various settings. All the settings I try result in loosing wifi after a period of time. Then the only way I can get it back is plug the AC back in and reboot.
I've been searching all over for any mention of a problem similar to mine and a possible fix. I found an article here: Disabling wireless power management in Ubuntu that seems to be addressing my problem. Since I am rather new to Kubuntu and the article is actually written for Ubuntu 10.10, I was wondering if someone more familiar with Kubuntu 11.04 could have a look at it and see if the solution detailed in the article might help my situation.
Thanks
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Re: Wireless becomes disabled when on battery power
any output to dmesg when this occurs?
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Re: Wireless becomes disabled when on battery power
Sorry, I don't know. What do I need to do to find out?Comment
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Re: Wireless becomes disabled when on battery power
start up, open a terminal, type "dmesg", wait for the wireless to die, type "dmesg" again and post any new lines.Comment
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Re: Wireless becomes disabled when on battery power
Well, I've been sitting here poking around the internet, reading the forum and many other article for a couple of hours and the wireless hasn't disabled itself yet. Every other time I have tried to use this laptop on battery only the wireless would be disabled within a half hour to 45 minutes. But not today. Looks like I'm going to have to try this again later.Comment
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Re: Wireless becomes disabled when on battery power
It's possible being on the battery isn't the problem. For example, I just had a laptop repaired because everytime I moved it, it would lock up. I noticed eventually that the wireless light would go out when this happened. It turned out to be the wireless card was loose or the connector was bad - it was under warranty so they replaced the mobo and wifi card.Comment
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Re: Wireless becomes disabled when on battery power
Okay, I did try it again and I tried to pay very close attention to everything as it happened (or didn't happen, as the case may be). I restarted the laptop while it was unplugged. A soon as it was finished booting up I opened the Konsole and typed dmesg. A whole lot of stuff printed to the Konsole. I left it up while I went about poking around the internet. After about 30 minutes I was no longer able to get web pages to load. But if I looked at the connection information in the lower right corner of the desktop it appeared that the wireless was still connected. I waited a bit longer. It did appear that somethings on the desktop were locked up but not everything. Things on the lower taskbar stopped responding to clicks. But after a minute or two everything that I had clicked suddenly jumped to life. Eventually the wireless information showed that it was no longer connected. At that point I went back to the still opened Konsole and typed dmesg in again. The window jumped a bit but no new information seemed to be added. Since I wasn't certain what to post to you I copied and pasted the entire Konsole information into Kate and saved the file. I then plugged the power cord in and restarted. Please let me know if you want me to post the contents of the txt file.
I understand you're suggesting there may be some physical problem with the laptop unrelated to the power management/wireless. This is of course a possibility. I have had the laptop for a couple years and until I recently replaced it with Kubuntu, it was running Windows 7 (that I had upgraded from Vista). There were no problems with wireless or power management before under those operating systems. While trying to sort out this problem the laptop has been sitting on my desk and I have not moved it about. But after reading your most resent post I picked it up and shook it
while it was plugged in, just to sort of rule out the possibility of something being loose. It didn't suffer any lockups or wireless problems after the shake. In case it's relevant the battery is new.
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Re: Wireless becomes disabled when on battery power
I have a similar problem with my laptop, although I do not lose my wifi connection when on battery power, it does drop considerably from approx 27mbs/s to 7mbs/s, often with the appearance that my connection is down as a page takes forever to load if at all.
When this happens I have to run a script to disable power management while running on battery power.
I did a post regarding this issue, which may or may not be of some use, assuming the problem you are having is in anyway related. Can't recall the title of the post at present, so I'd have to search for it.Kubuntu 15.10Comment
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Re: Wireless becomes disabled when on battery power
Just a hunch - are you using KDE Network Manager? I am having a similar problem on one of my laptops and I'm pretty sure it's networkmanagers fault. I might have a chance to change over to WICD todya, I'll post back if I'm right.Comment
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Re: Wireless becomes disabled when on battery power
Yes, I am using KDE Network Manager.Comment
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Re: Wireless becomes disabled when on battery power
This is what happened today....
I started up my laptop while the power cord was plugged in, then I unplugged it after everything was finished starting. I poked around the Internet for about an hour and 15 minutes and at that time web pages stopped loading. The information in the lower right corner of the desktop indicated that the wireless was still connected and enabled. At this point I experienced a momentary desktop freeze up. I plugged the power cord back in, the desktop recovered. Web pages continued not to load. Instead of reboot at this point I decided to give it a little time to see if it would sort itself out. Everything remained the same after 20 minutes. I then decided to go off and do something else for a while and put the laptop into sleep mode. When I returned and woke up the laptop the network information in the lower right corner of the desktop said, "wireless is disabled by hardware." I rebooted. When everything came back up the network information in the lower right corner of the desktop said, "wireless is disabled by software." I was able to click the unchecked "enable" box and the wireless started up right away.
I can of course use the laptop for hours on end with no wireless problems when the power cord is plugged in the entire time.Comment
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Re: Wireless becomes disabled when on battery power
Are you prepared to remove Knetwork Manager and try WCID instead? I was having intermittent problems with my wifi when I first installed kubuntu, haven't had any problems with WCID except for a reduction of speed on battery power but that is the power management and not the network manager.Kubuntu 15.10Comment
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