Hi,
my ThinkPad X220 runs Fedora 23 with automatic updates, Chromium and
Spotify Copr. Up until Friday night, it worked just fine.
Friday afternoon the new Kernel 4.4.5 was installed. It was only loaded
on Saturday when I started the machine in the afternoon. I suspended the
laptop to RAM and found that it did not woke up. I only got this strange
light show:
https://www.youtube.com/watch?v=ajoWfCtk7yE
The error (sadly) is 100% reproducible. I then went on and started with
the earlier kernels, 4.4.4 and 4.4.3, which worked fine before Friday.
(Thanks for keeping three kernels by default!) The error is just the
same, it does not wake up.
There are more kernels available here:
http://koji.fedoraproject.org/koji/packageinfo?packageID=8
You should also try kernel-4.4.4-300.fc23 and kernel-4.4.4-301.fc23 to best find the point
of regression. Then please file a bug into bugzilla against kernel, and describe your
problem. If you have localized your issue well between two minor updates, there's a
high chance the kernel team can find the regression and fix it (also feel free to poke
someone at #fedora-kernel if you see no feedback on that bug report).
However, I have to say that I also have X220 at home, I tested it with kernel 4.4.5-300
and found no issues with suspend. Your hardware doesn't have to be exactly the same as
mine, though. It just means that not all X220 laptops are affected.