Same issue here with a Lenovo Thinkpad T61 with 18.04 (standard kernel). Seems to be that iwl3945 has an issue with having the driver feature "power save" activated.
This might be related to https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1627828 What works for me thins some weeks without any issue is the following: Type iwconfig and look at the output. You should see the name of your chip-set as well as the whether power management is off or on. If it doesn't say, it is probably off. To turn off power management, go to /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf and you will see [connection] wifi.powersave = 3 For reference: https://gist.github.com/jcberthon/ea8cfe278998968ba7c5a95344bc8b55 Would it be possible to change the WiFi setup process in system installer to disable power save for iwl3945. Other option: Ignore power save setting for iwl3945 in kernel driver? Just some ideas. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1762248 Title: WiFi connection suddenly drops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1762248/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
