Comment 0 for bug 1387221

Hardware: Broadcom Corporation BCM4331 802.11a/b/g/n (rev 02)

This chip is working perfectly fine on 2.5GHz and 5GHz using version 6.20.155.1+bdcom-0ubuntu6 of the driver.

After upgrading to saucy or any newer version and installing version >=6.30.223.30+bdcom-0ubuntu1 it fails to find any 5GHz networks and connections on 2.5GHz are unstable.

Downgrading the machine to kernel 3.8.x and bcmwl-kernel-source 6.20.155.1+bdcom-0ubuntu6 (both from raring) makes the chip work again.
UPDATE: Up to kernel 3.13.0-23 a patched working package of bcmwl-kernel-source 6.20.155.1+bdcom-0ubuntu6 can be found in the comments of this bug report: https://bugs.launchpad.net/ubuntu/+source/bcmwl/+bug/1189611
Currently there is no way to have utopic with an up to date kernel and properly working BCM4331 chip at the same time.

Looking at the changelog its most likely caused by the update to the new upstream release in version 6.30.223.30+bdcom.

As of utopic unicorn this is still broken.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: bcmwl-kernel-source 6.20.155.1+bdcom-0ubuntu6
ProcVersionSignature: Ubuntu 3.16.0-23.31-generic 3.16.4
Uname: Linux 3.16.0-23-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Oct 29 15:26:09 2014
InstallationDate: Installed on 2012-11-10 (717 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Beta amd64+mac (20120926)
SourcePackage: bcmwl
UpgradeStatus: Upgraded to utopic on 2013-10-22 (372 days ago)