On my desktop, which is connected to my monitor via an HDMI cable, whenever I turn the display off, either (1) by physically pressing the power off button, then powering it on again, (2) putting it to sleep and waking it up, or (3) waiting for the power manager to turn it off after X minutes of inactivity, in all cases the result is the following: the screen remains black, the monitor says "No signal", and I cannot turn it back on.

This is reproducible in the following live ISOs:

- Xubuntu 16.04.1
- Linux Mint XFCE 18 "Sarah"
- Fedora (XFCE spin) 24 1.2

This does NOT happen on Debian Jessie (which I'm currently using).

The problem is grave enough (and simple enough to reproduce, thanks to live ISOs) that I am willing to spend time debugging it. I've spent hours googling for solutions, but most of they did not work for me. For instance, one of them suggested switching terminals and doing "xrandr -d :0 --auto", but it didn't work for me.

Note that otherwise, Linux works just fine: I can switch terminals without problems and do anything I want on these terminals.

I've been using KDE on the same computer for years without any issues, but I want to switch to XFCE, and the presence of this bug in all recent distributions makes me really worried that I won't be able to use XFCE in the future.

I've tried looking at several logs, like .xsession-errors, /var/log/lightdm, etc., but got no conclusive answer. Any hints on how to debug this are welcome.