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Date: Fri, 26 Aug 2011 14:21:54 -0000
From: Launchpad Bug Tracker <638303@bugs.launchpad.net>
To: brian@ubuntu.com
Reply-To: Bug 638303 <638303@bugs.launchpad.net>
Sender: bounces@canonical.com
References: <20100914180353.7774.99994.malonedeb@wampee.canonical.com>
Subject: [Bug 638303] [NEW] Don't give up scanning so easily
Message-Id: <20110826142154.25512.32020.launchpad@gac.canonical.com>
Errors-To: bounces@canonical.com
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Gema Gomez (gema.gomez) has assigned this bug to you for wpasupplicant in U=
buntu:

Binary package hint: wpasupplicant

I was working on a machine with a broadcom wifi card.  It used the
proprietary wl.o driver.  I noticed that when I resumed from suspend or
pressed the F2 button (which on this machine is an rfkill button) to
enable wifi, reconnection times with NetworkManager were around 30s.
This seemed too long to me.

Investigation revealed that wpasupplicant was scanning after the card
was brought up in these scenarios, but failed because (I assume) the
wl.o driver was not ready yet.  Then it gave up scanning.  NM never saw
new access points, so didn't bother trying to connect.  Then it waited
20s, like it does, before asking wpasupplicant to try scanning again.
This scan succeeded and NM proceeded to connect.

I came up with the following patch to get wpasupplicant to try a little
harder to scan and forwarded it upstream (see linked bug):

Index: wpasupplicant-0.6.9/wpa_supplicant/events.c
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--- wpasupplicant-0.6.9.orig/wpa_supplicant/events.c	2010-09-13 15:28:08.00=
0000000 -0400
+++ wpasupplicant-0.6.9/wpa_supplicant/events.c	2010-09-13 15:28:14.0000000=
00 -0400
@@ -619,6 +619,7 @@
 		wpa_printf(MSG_DEBUG, "Failed to get scan results - try "
 			   "scanning again");
 		timeout =3D 1;
+		wpa_s->scan_req =3D 1; /* Force scan again */
 		goto req_scan;
 	}
 =


This is a tracking bug for the issue.

** Affects: wpasupplicant
     Importance: Medium
         Status: Confirmed

** Affects: wpasupplicant (Ubuntu)
     Importance: Low
     Assignee: Canonical Foundations Team (canonical-foundations)
         Status: In Progress


** Tags: oem-services patch-forwarded-upstream
-- =

Don't give up scanning so easily
https://bugs.launchpad.net/bugs/638303
You received this bug notification because you are a member of Canonical Fo=
undations Team, which is a bug assignee.