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March 2013

SCIENTIFIC-LINUX-USERS@LISTSERV.FNAL.GOV

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Subject:
From:
Steven Haigh <[log in to unmask]>
Reply To:
Steven Haigh <[log in to unmask]>
Date:
Tue, 12 Mar 2013 21:45:08 +1100
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On 12/03/13 21:03, Steven Haigh wrote:
> Hi all,
>
> I've been trying to figure out the cause of this... It seems I'll be
> using the wifi without issue, then NetworkManager will indicate that it
> is reconnecting. It seems to happen randomly with no real pattern.
>
> iw events -t shows:
> 4b:d6:98:14:48 -> 00:0f:66:c5:2d:6b reason 3: Deauthenticated because
> sending station is leaving (or has left) the IBSS or ESS
> 1363082116.240481: wlan0 (phy #0): disconnected (local request)
> ....
> 1363082122.323703: wlan0 (phy #0): auth 00:0f:66:c5:2d:6b ->
> 1c:4b:d6:98:14:48 status: 0: Successful
> 1363082122.344295: wlan0 (phy #0): assoc 00:0f:66:c5:2d:6b ->
> 1c:4b:d6:98:14:48 status: 0: Successful
> 1363082122.347571: wlan0 (phy #0): connected to 00:0f:66:c5:2d:6b
>
> Interestingly, I've only had this problem under linux. The access point
> is stable and works fine with the same card under Windows 7 - as well as
> our smart phones etc etc. The access point hasn't changed in a number of
> years (4+).
>
> At the moment, I'm using the kernel-ml from elrepo until I can get the
> eeepc module re-enabled for 64 bit kernels from our wondering upstream
> provider. (Battery life dies to about 3.5 hours instead of 5+ with it!)
>
> I've tried 'iwconfig wlan0 power off' to disable power management from
> the wifi adapter, but the dropouts still seem to randomly happen. The AP
> is secured with WPA2-PSK (AES+TKIP) - not sure if that makes a
> difference...
>
> Does anyone have any thoughts in troubleshooting this?
>

I should note as well that I added the following to a new file called 
/etc/modprobe.d/wireless.conf:
options ath9k nohwcrypt=1

This doesn't seem to have made a difference.

-- 
Steven Haigh

Email: [log in to unmask]
Web: https://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897
Fax: (03) 8338 0299

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