Using either NetworkManager or Wicd to manage wireless networking on my Wi-Fi-powered laptop, too often I get randomly disconnected, and I see these messages on /var/log/syslog:Dec 10 05:21:26 debian dhclient: DHCPREQUEST on wlan0 to 10.0.0.2 port 67Dec 10 05:21:26 debian dhclient: DHCPACK from 10.0.0.2Dec 10 05:21:26 debian dhclient: bound to 10.0.0.4 -- renewal in 1662 seconds.Dec 10 05:40:38 debian kernel: [105982.935232] iwlagn 0000:06:00.0: Microcode SW error detected.  Restarting 0x82000000.Dec 10 05:40:38 debian kernel: [105983.182330] Registered led device: iwl-phy0::radioDec 10 05:40:38 debian kernel: [105983.182586] Registered led device: iwl-phy0::assocDec 10 05:40:38 debian kernel: [105983.182658] Registered led device: iwl-phy0::RXDec 10 05:40:38 debian kernel: [105983.182872] Registered led device: iwl-phy0::TXI think 05:40:38 is the first line that indicates troubleWith NetworkManager, I recover from this situation with the following command each time this happens:nmcli nm wifi off && nmcli nm wifi onOutput of uname -a:Linux debian 2.6.32-5-686-bigmem #1 SMP Thu Nov 25 19:30:54 UTC 2010 i686 GNU/Linuxnotes:Wi-Fi chipset is Intel's 4965.I reproduced this problem on 2.6.32, 2.6.36 and 2.6.37-rc4 kernel versions.
Wi-Fi constantly disconnects
kernel;debian;wifi
This is a known bug with the iwlagn driver.  Updating the driver and/or firmware may fix your issue:https://bugs.launchpad.net/linux/+bug/200509