linux-kernel - Re: ath5k regression associating with APs in 2.6.38

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Message-ID: <20110519212814.GA16139@thinkpad-t410>
Date:	Thu, 19 May 2011 16:28:14 -0500
From:	Seth Forshee <seth.forshee@...onical.com>
To:	Nick Kossifidis <mickflemm@...il.com>
Cc:	"John W. Linville" <linville@...driver.com>,
	Jiri Slaby <jirislaby@...il.com>,
	"Luis R. Rodriguez" <lrodriguez@...eros.com>,
	Bob Copeland <me@...copeland.com>,
	linux-wireless@...r.kernel.org, ath5k-devel@...ema.h4ckr.net,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: ath5k regression associating with APs in 2.6.38

On Tue, May 17, 2011 at 01:50:32PM -0500, Seth Forshee wrote:
> On Tue, May 17, 2011 at 08:14:34PM +0300, Nick Kossifidis wrote:
> > 2011/5/17 Seth Forshee <seth.forshee@...onical.com>:
> > > On Mon, May 09, 2011 at 09:02:30AM +0200, Seth Forshee wrote:
> > >> On Thu, May 05, 2011 at 05:30:42PM +0300, Nick Kossifidis wrote:
> > >> > Hmm I don't see any errors from reset/phy code, can you disable
> > >> > Network Manager/wpa-supplicant and test connection on an open network
> > >> > using iw ? It 'll give us a better picture...
> > >> >
> > >> > If iw doesn't return any scan results we are probably hitting a PHY/RF
> > >> > error specific to your device (not all vendors follow the reference
> > >> > design). Maybe we should follow a blacklist/whitelist approach for
> > >> > this feature.
> > >>
> > >> I got the results back from my tester. He was able to get scan results,
> > >> but it took multiple tries and the direct probe failures appear in the
> > >> log. He didn't enable ATH5K_DEBUG_RESET this time; let me know if you
> > >> need that and I'll request he retest with the extra debug logs enabled.
> > >
> > > I got some more feedback. Most of the time iw does not get scan results,
> > > but even when it does connecting to the AP isn't always successful. The
> > > tester did note that he doesn't seem to have any trouble if his machine
> > > is within a few feet of his AP. Let me know if you'd like something else
> > > tested.
> > >
> > > I noticed that bugzilla #31922 (ath5k: Decreased throughput in IBSS or
> > > 802.11n mode) is also fixed by reverting 8aec7af9. It seems like the
> > > synth-only channel changes are resulting in poor connection quality.
> > > Maybe that patch needs to be reverted?
> > >
> > > Thanks,
> > > Seth
> > >
> > >
> > 
> > http://www.kernel.org/pub/linux/kernel/people/mickflemm/01-fast-chan-switch-modparm
> 
> That looks like it should do the trick. I'll request some testing with
> it and let you know how it goes. Thanks!

I've received feedback from a number of testers that the patch fixes the
wireless problems they've been seeing since upgrading to 2.6.38, so this
fix looks good from my perspective.

Thanks,
Seth

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