Hi, Endless OS recently upgraded from Linux 4.11 to Linux 4.13, and we now have a few reports of issues with ath9k wireless becoming unusable. In the logs we can see that it authenticates, associates and completes the WPA 4 way handshake, before then being disconnected with: wlp2s0: CTRL-EVENT-DISCONNECTED bssid=74:26:ac:68:2f:c0 reason=4 locally_generated=1 The cycle then repeats with it connecting again before being swiftly disconnected, etc. More logs: https://gist.github.com/dsd/49f263c67c2859838ce168628ab043e0 At the same time that we upgraded the kernel, we also upgraded many other components (e.g. NetworkManager and wpa_supplicant), however the same problem has been reported on Arch Linux and a user there reports that he narrowed it down to a kernel regression between 4.12 and 4.13: https://bbs.archlinux.org/viewtopic.php?id=225199 Unfortunately we can not reproduce this in our office, so can't offer much more info yet, but we are continuing to investigate. I have not found any codepaths in userspace that generate disconnect reason 4, so I think it must be something in the kernel causing the disconnection, but I did not see any suspicious changes in recent commit history. It would be good to hear from anyone who has heard of this or has any ideas about causes or solutions. Thanks Daniel
