I am suffering from the same problem. My NIC is an Intel 6205:
03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6205 (rev 34)
Subsystem: Intel Corporation Centrino Advanced-N 6205 AGN
Flags: bus master, fast devsel, latency 0, IRQ 49
Memory at f2500000 (64-bit, non-prefetchable) [size=8K]
Capabilities: <access denied>
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi
My observations are:
Almost all WiFi networks work flawless using NetworkManager. However,
with some networks I have persistent problems. I get a connection for a
few minutes following boot-up, after that the NetworkManager icon goes
to "scanning" and the syslog fllls up with "direct probe timed out
messages. I experience this problem *only* in my university. They use
exclusively Cisco equipment. I can look up the access point models if
necessary.
I am rather sure that NetworkManager is part of the problem. I
experience the problem even when trying to connect to an unencrypted
network at my university. However, when I stop NetworkManager and
connect manually (iwconfig wlan0 essid FOO; ifconfig wlan0 up; dhclient
wlan0) the bug does not occur even after hours.
I also tried "iwconfig wlan0 power off" but this does not fix the
"direct probe timeout" problem.
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https://bugs.launchpad.net/bugs/924082
Title:
NM fails to connect to campus Wi-Fi network; wicd succeeds -- Centrino
Ultimate-N 6300 iwlwifi
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