I manually installed firmware version 5.100.138 using the b43-fwcutter tool, and my throughput has returned to normal. I recommend that the b43 installer package default to this firmware for the BCM4306 (rev 03).
I still get the "swiotlb buffer" spamming my logs, but that might have been happening before. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to b43-fwcutter in Ubuntu. https://bugs.launchpad.net/bugs/1899848 Title: Broken WiFi Install on Ubuntu (MATE) 20.10 for BCM4306 (rev 03) Status in b43-fwcutter package in Ubuntu: New Bug description: Device ID: Network controller [0280]: Broadcom Inc. and subsidiaries BCM4306 802.11b/g Wireless LAN Controller [14e4:4320] (rev 03) WiFi worked correctly in Ubuntu MATE 20.04. Now I'm getting very slow throughput and constant error messages like the following: b43-pci-bridge 0000:03:02.0: swiotlb buffer is full (sz: 2390 bytes), total 0 (slots), used 0 (slots) It sounds like this may be related to errors introduced in b43-fwcutter 1:019-5 with installing the wrong firmware, as reported in Debian bugs #958566 and #960279. ProblemType: Bug DistroRelease: Ubuntu 20.10 Package: firmware-b43-installer 1:019-6 ProcVersionSignature: Ubuntu 5.8.0-22.23-generic 5.8.14 Uname: Linux 5.8.0-22-generic x86_64 ApportVersion: 2.20.11-0ubuntu49 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: MATE Date: Wed Oct 14 14:52:18 2020 InstallationDate: Installed on 2019-12-08 (311 days ago) InstallationMedia: Ubuntu-MATE 19.10 "Eoan Ermine" - Release amd64 (20191017) PackageArchitecture: all RebootRequiredPkgs: bcmwl-kernel-source bcmwl-kernel-source SourcePackage: b43-fwcutter UpgradeStatus: Upgraded to groovy on 2020-10-12 (2 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/b43-fwcutter/+bug/1899848/+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
