I am also experiencing the same issue with on a Dell XPS 13 9370 that I upgraded to 18.04. I added mem_sleep_default=deep to my grub boot options to workaround the battery drainage when "suspended". Just like other people, I can't seem to figure out a pattern to reproduce the issue with 100% certainty. I checked and the BIOS is up to date, and my wifi firmware is WLAN.RM.4.4.1-00079-QCARMSWPZ-1.
When the problem happens, the only way I can get wifi back is to reboot or shutdown + boot, sometimes it takes more than one reboot to get wifi back up. For some reason, a complete shutdown + boot appears to work better than a simple reboot. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1799988 Title: Missing wifi and bluetooth after sleep on XPS 9370 To manage notifications about this bug go to: https://bugs.launchpad.net/dell-sputnik/+bug/1799988/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
