Comment 26 for bug 944271

I am running Ubuntu 14.04.1 LTS and experiencing this issue (broken wifi until reconnection, "Microcode SW error detected. Restarting 0x20000000" in dmesg) on Lenovo G550 which has Intel WiMAX/WiFi Link 5150 with the following configuration: broadcast=yes driver=iwlwifi driverversion=3.13.0-45-generic firmware=8.24.2.2 ip=192.168.0.16 latency=0 link=yes multicast=yes wireless=IEEE 802.11abg).

After adding "options iwlwifi 11n_disable=1" to /etc/modprobe.d/iwlwifi.conf and testing for half an hour, the original issue seems to be gone, although according to dmesg, a "microcode sw error" is still detected but this time with a different restarting number: "iwlwifi 0000:04:00.0: Microcode SW error detected. Restarting 0x82000000." Either way, wifi seems to work better with this workaround.