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Old 12-29-2008, 03:08 AM   #1
kendo9991
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Reconnecting wireless network in Ubuntu


On occasion (cause not yet found) my wireless connection breaks. When I go into Network Manager, I have found, by experimenting, that I can reconnect by a) unlocking by giving password, b) clicking on the ticked box against "Wireless connection" and waiting as it re-ticks the box, c) highlighting "Wireless connection" and clicking on "Properties" d) changing DHCP to IPv4 LL, changing back to DHCP and then waiting for the network interface change to take effect. Usually this reconnects.

If I go into "Connection Properties" and try to "Configure", I am told that "The interface does not exist" yet a connection is there. Entering "sudo iwconfig" I can see that wlan0 has Tx-Power=27 dBm, Link Quality 69/100 and Signal level=-62 dBm. I am using a Cable & Wireless rt2500 PCMCIA card on a Compaq Evo N800C laptop.

Is there a better way to get back on? Should the interface "exist"? Does this indicate a fault that I can correct?

Thanks in advance

Last edited by kendo9991; 12-29-2008 at 03:14 AM. Reason: Trying to add tags
 
Old 12-29-2008, 09:13 AM   #2
digital8doug
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Lightbulb Try iommu=noaperture as kernel boot option, then edit /boot/grub/menu.lst

Just a guess as I had similar problems, see thread on iommu.

Quote:
Originally Posted by kendo9991 View Post
SNPD/EDTD On occasion (cause not yet found) my wireless connection breaks.
Is there a better way to get back on? Should the interface "exist"? Does this indicate a fault that I can correct?
Use command on boot to see if it helps. If so, then edit loader.

Does not hurt to try, may solve it, as it did for me in Kubuntu 8.1, 9.04 & Fedora.
http://www.linuxquestions.org/questi...y-hole-624088/

Good info even though there was a bit of fire exchanged

Please LET US KNOW IF THIS WORKS

Last edited by digital8doug; 12-29-2008 at 10:21 PM.
 
Old 12-30-2008, 03:01 AM   #3
kendo9991
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Thanks for your quick reply. I gather from the link that I should try adding iommu=noapg to the kernel line in menu.lst. I will do that and if the disconnection recurs, I will let you know to see if there are any other ideas. As this disconnection happened only occasionally, it may be a while before I am confident that this has fixed it.
 
Old 12-30-2008, 03:03 AM   #4
kendo9991
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Well since writing back to you, it has gone down twice so the additional parameter has not helped. My workaround has resurrected the connection but the procedure is a bit unwieldy. Does anyone have other ideas?

Last edited by kendo9991; 12-30-2008 at 01:13 PM. Reason: Updated information
 
Old 02-04-2009, 03:09 AM   #5
kendo9991
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Update.

I have ditched the Linksys wireless and Etec ADSL in favour of a Netgear ADSL/Wireless router and upgraded from Ubuntu 8.04 to 8.10. There has been no loss of connection since then.

As an aside, with Ubuntu 8.10, the rt2500 ran slow (1Mb/s) and at low signal strength until I forced 54Mb/s. If I use a C&W USB dongle instead, I get 100% signal strength and full speed but I prefer the PCMCIA as it leaves a USB port free and is less prone to accidental knocking.
 
  


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