From: Detlev Casanova <detlev.casanova@gmail.com>
To: Dan Williams <dcbw@redhat.com>
Cc: Johannes Berg <johannes@sipsolutions.net>,
	linux-wireless@vger.kernel.org, laurent.pinchart@ideasonboard.com
Subject: Re: NetworkManager not listing access points
Date: Sun, 29 Sep 2013 21:29:17 +0200
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In-Reply-To: <1379952829.2475.16.camel@dcbw.foobar.com>
References: <31357461.i5mG9q5IfA@naboo> <3006906.Q9n0kfrGGo@naboo> <1379952829.2475.16.camel@dcbw.foobar.com>
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Le lundi 23 septembre 2013 11:13:49 Dan Williams a ?crit :
> On Sun, 2013-09-22 at 16:20 +0200, Detlev Casanova wrote:
> > Le samedi 21 septembre 2013 22:51:59 Johannes Berg a ?crit :
> > > On Thu, 2013-09-19 at 07:58 +0200, Detlev Casanova wrote:
> > > > Here is the output (attached file for formatting)
> > > 
> > > Was that from the good case? The bad case would have been
> > 
> > more
> > 
> > > interesting.
> > 
> > This is both cases. I made another one and here, I can give more
> > details:
> > 
> > Network manager is trying to list APs and fails until time
> > 1379858724.386569
> 
> Ok, the logs indicate that the driver simply doesn't see any scan
> results:
> 
> 1379858724.381522: Received scan results (0 BSSes)
> 
> Then 20 seconds later (after the explicit iwlist), it finds some scan
> results:
> 
> 1379858746.953924: Received scan results (3 BSSes)
> 
> So I'm not sure what's going on here, but I don't think NetworkManager
> is the issue; it's likely in the supplicant's scanning code or in the
> driver itself.  NetworkManager asks the supplicant to scan with both the
> wildcard SSID and any hidden-tagged SSID, and the wildcard SSID should
> ensure that all available APs are found.

Yes and the problem is most likely to be in the driver because it doesn't 
occur before commit 0172bb75073e11a5aa9d8a953bdaefb8709f00c8 ("cfg80211: use 
DS or HT operation IEs to determine BSS channel")

> Johannes, does anything else jump out at you in the logs?
> 
> Dan
> 
> > The The first "iwlist wlan0 scan" is done juste after the log line
> > (1379858738.682054). It lists the APs in range in the console but
> > not in the Network Manager ui.
> > 
> > The second "iwlist wlan0 scan" is done at time 1379858739.802067
> > and APs are being listed in the console and in the Network Manager
> > UI.
> > 
> > After that, NM will connect to the acces point with SSID "Maison".
> > 
> > It also looks like the listing in Network Manager comes between the
> > moment "iwlist wlan0 scan" is run for the second time and the
> > moment is shows its output on the console.
> > 
> > Detlev.