Comment 26 for bug 1435728

The trigger was not the kernel version. The trigger is upstart or systemd. The laptop reliably reconnects to wifi after resume if I have booted using the 'upstart' option in the grub advanced boot menu. If I have booted using the default grub selection, the laptop reliably fails to reconnect to wifi after resume.

I have been working in 'upstart' mode most of the time recently, for unrelated compatibility issues, which is why I had been unable to reproduce this for the last week.

I will attach kern.log logs, showing a fresh boot in upstart mode followed by three successful suspend/resumes. And kern.log logs, showing a fresh boot in systemd mode followed by three failed suspend/resumes (and rmmod, modprobe in between).