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Bug#600021: linux-source-2.6.32: increase timeout for AP probe on iwl3945?

On Tue, 2010-10-12 at 14:17 -0700, Mark Hedges wrote:
> Package: linux-source-2.6.32
> Version: 2.6.32-23
> Severity: normal
> Oct 12 14:08:36 maggie kernel: [435532.500060] No probe response from AP 00:0f:66:0b:45:5a after 500ms, disconnecting.
> Oct 12 14:08:36 maggie wpa_supplicant[1506]: CTRL-EVENT-DISCONNECTED - Disconnect event - remove keys
> Oct 12 14:08:36 maggie NetworkManager[1480]: <info> (wlan0): supplicant connection state:  completed -> disconnected
> Oct 12 14:08:36 maggie NetworkManager[1480]: <info> (wlan0): supplicant connection state:  disconnected -> scanning
> This happens from time to time and is a little annoying.  When it happens,
> I'm able to reconnect.  Other people in the cafe don't seem to have any
> service interruption.  Is there a way this probe timeout could be increased
> to accommodate a buggy AP?

This probe timeout is applied by the software 802.11 stack (mac80211),
not specifically the iwl3945 driver.  If I understand correctly, it
repeats the probe request up to 5 times if no response is received.
Thus this disconnection occurs only when communication with the AP has
been broken for 2.5 seconds.  I doubt that increasing this time limit
will fix the problem; more likely there is a bug elsewhere that causes
frames to be dropped or sent at too low a power level.

Please test Linux 2.6.36-rc6 as packaged in experimental and report
whether this makes any difference.


Ben Hutchings
Once a job is fouled up, anything done to improve it makes it worse.

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