Since a few days (I guess caused by some recent update) I have a problem with my wifi connection on Ubuntu 12.04.
I see all the wifi networks and can connect successfully. The wifi works perfectly fine for like one day. Then all of a sudden (maybe caused by the update manager?) my wifi disappears. It is not listed as available anymore. I also cannot connect to it manually (as a hidden network) and it does not appear if I run iwlist scan. All other wifi networks are still there and I can connect to them.
What works though is change the SSID of my Network. I can then connect again under the new SSID. But again after one day or so it disappears and I have to change the SSID again.
This is very anoying.
Not only don't I know how to solve the problem. I do not even know where to start searching for the cause. I.e. which logfiles should I check? What can I try to debug? I will happily provide you with any information about my system. Just tell me where to start.
Thanks for any helpful advice.
EDIT: So this is the output of lshw -class network:
description: Wireless interface product: BCM4312 802.11b/g LP-PHY vendor: Broadcom Corporation physical id: 0 bus info: pci@0000:0c:00.0 logical name: eth1 version: 01 serial: 00:16:44:f0:43:fd width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless configuration: broadcast=yes driver=wl0 driverversion=220.127.116.11 (r326264) latency=0 multicast=yes wireless=IEEE 802.11abg resources: irq:17 memory:f6cfc000-f6cfffff
The dmesg logfile is here: https://www.dropbox.com/s/3ohtabodt7i00f8/dmesg.txt