After further testing over many days, I am almost certain that this problem is caused by the power-saving mode in the Broadcom drivers, which is enabled when the laptop is on battery by the script in /usr/lib /pm-utils/power.d/wireless which runs "iwconfig eth2 power on". Manually running "iwconfig eth2 power off" seems to fix the problem, as does plugging in the laptop. I replaced the pm script with one that always runs "iwconfig eth2 power off" regardless of battery status, and I have not had any major connectivity issues since then.
So, in conclusion, I think we can mark this as a duplicate of https://bugs.launchpad.net/ubuntu/+source/linux/+bug/991232 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/995130 Title: BCM4321 Wireless dropping connection randomly with no indication To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/995130/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
