When I connect to my university's wireless network with my macbook, the
connection is dropped in ~15 minutes without fail, forcing me to manually
reconnect. Every time, dmesg leaves me with this little tid bit:

wlan0: deauthenticated from 00:21:d8:d5:1d:11 (Reason: 1)

but I don't really know what that means. Back when I was using nm-applet, it
would always leave "Roamed from [ESSID] to (none)" messages when this
happened, so I assume it must have something to do with roaming. No other
machines seem to have this problem, so it can't entirely be the network's
fault, and I don't have this problem while running OS X, so it's not a
defect in my wireless card. To my limited knowlege of these things, that
leaves ath9k as the culprit. Here's the relevant info from lspci:

02:00.0 Network controller [0280]: Atheros Communications Inc. AR5008
Wireless Network Adapter [168c:0024] (rev 01)

and my kernel version is 2.6.37.5-1.

A couple extra comments:
1) Yes, the power management for my wireless card is set to "off" (according
to iwconfig)
2) I don't know much about network stuff, or what stuff you need from me to
be able to help me with the problem, but I would be willing to go to great
lengths to get this fixed (it's driving me bonkers) so tell me what I need
to do, and I'll try it.
3) If it's really just roaming without being able to find a new connection,
I would rather give up roaming functionality entirely, and just set up the
connection manually wherever I go, instead of dealing with this problem.

Thanks,
Luke
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