Following up further, it appears that the acpi=noirq option is NOT a workaround. My connection stayed up the first few times I tried it, but since it seems to fail after about the same period of time.
Sorry for the false lead! -- BCM1390M (broadcom 4311) with ndiswrapper and nvidia IRQ conflicts https://launchpad.net/bugs/57355 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
