When I engage light-locker to lock my screen, it locks the screen and disables power to the monitor, as it should. However, I can never get video back again after that. Power to the monitor is never restored, and the only way I can get my video back at that point is to restart my display manager, for instance by SSHing in from another machine. At that point, the video comes back and I can use the system again.
This problem only happens on my AMDGPU-based Radeon system. I have another system that uses Intel video that doesn't have this problem. I should note, though, that in Trusty 14.04 the power save and restore functions worked perfectly fine, and there was no issue restoring video when I wanted the system to wake up the video. But of course, at that point I was using FGLRX as my video driver, which is no longer supported or available in 16.04.
I'm very willing to help debug this, so if there is anything I can do to help, please let me know.
Thanks,
Brian
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xserver-xorg-video-amdgpu 1.0.1-1build2
ProcVersionSignature: Ubuntu 4.4.0-15.31-generic 4.4.6
Uname: Linux 4.4.0-15-generic x86_64
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
Date: Thu Mar 24 20:43:48 2016
InstallationDate: Installed on 2016-03-22 (2 days ago)
InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160318)
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: xserver-xorg-video-amdgpu
UpgradeStatus: No upgrade log present (probably fresh install)
I should also add that I've tried disabling all of my power management in my window manager settings, but the problem still occurs; that may or may not be a bug in the window manager power management, but the net effect appears to be that it is requesting the driver to cut the power to the monitor, regardless, and then of course we end up with the same problem we had before, which is that the video cannot come back without a restart of the X server.