Gao Shichao, thank you for your comment. So your hardware and problem may be tracked, could you please file a new report with Ubuntu by executing the following in a terminal while booted into the default Ubuntu kernel (not a mainline one) via: ubuntu-bug bcmwl
For more on this, please read the official Ubuntu documentation: Ubuntu Bug Control and Ubuntu Bug Squad: https://wiki.ubuntu.com/Bugs/BestPractices#X.2BAC8-Reporting.Focus_on_One_Issue Ubuntu Community: https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette When opening up the new report, please feel free to subscribe me to it. As well, please do not announce in this report you created a new bug report. Thank you for your understanding. Helpful bug reporting tips: https://wiki.ubuntu.com/ReportingBugs -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to bcmwl in Ubuntu. https://bugs.launchpad.net/bugs/1189611 Title: bcmwl-kernel-source 6.30.223.30+bdcom-0ubuntu1 fails to see 5GHz networks and is unstable on 2.5GHz Status in “bcmwl” package in Ubuntu: Invalid Bug description: 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 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 saucy machine to kernel 3.8.x and bcmwl-kernel-source 6.20.155.1+bdcom-0ubuntu6 (both from raring) makes the chip work again. Downgrading just the kernel to 3.8 and keeping bcmwl-kernel-source at version 6.30.223.30+bdcom-0ubuntu1 does NOT fix the issue. Looking at the changelog its most likely caused by the update to the new upstream release. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/bcmwl/+bug/1189611/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
