I noticed it first on my laptop that suspending the system by either waiting for xfce-power-manager to kick in or using pm-suspend from the CLI resulted in a non-responsive system (black screen, power still on but no response). I now see the same behavior on my desktop.
Nix is fresh install of 19.09 on both devices, xfce4. No power settings in config. pm-utils is installed. Xfce pulls in upower and I can see the daemon running in htop.
So, I know this is hard to troubleshoot here, but any suggestions of where to start I would most appreciate.
I’ve noticed this too. I can deal with it doing the following: always I
wanna suspend, I close the lid or issue systemctl suspend without the
power plug connected, ie relying only on the netbook battery. I haven’t
had problems in years with this technique but occasionally when I forget
I end up with a unresponsive system.
I’ve seen this too - happens every now and then. Hard to debug since it’s a freeze.
Hard to debug since it’s a freeze.
Yes, and it happens in the last moment, so s2both works but doesn’t preserve any evidence.
Yes, I don’t see anything in the pm-suspend.log (which simply reports ‘suspend successful’) and with a glance at the journal I don’t see anything remarkable either.
I’m using kernel 4.19, are any of you using the 5.x and still seeing this?
I’m using 5.3.6 for a few weeks and I haven’t seen it in a while. Not sure it correlates, but there’s some hope 
I’m using kernel 4.19, are any of you using the 5.x and still seeing this?
Yes, at 5.x (currently 5.3) and Thinkpad W530 and intel_pstate=off (sometimes suspend works, will see whether AC power makes a difference, there are indeed some regressions in handling power)