$ uname -r
4.15.0-23-generic
$ lsb_release -r
Release: 18.04
First happened after upgrading kernel version to 4.15.0-23-generic
but when I switched back to 4.15.0-20-generic
it worked fine until now (there was an update a few days ago). Now my laptop does not wake up from suspend on either kernel version.
Any suggestions on what to look at / try out? I've tried the suggestions I've been able to find online but to no avail.
4.15.0-23-generic
kernel version.