Public bug reported:
I have an RX480 GPU with three 4K screens attached, running the AMDGPU
open-source driver.
Once the screens have gone into stand-by (or I shut them off) I get a
black screen when I turn them back on.
To be more precise: I get a black X11 screen, because the mouse is still
visible and able to move around. The cursor even changes when I hover
over (what I assume to be) text fields.
I've already disabled all the power management options, but it still
happens when I manually shut the monitors off.
I can still change to another virtual console using the ALT+F keys, then
they work, but switching back to the X11 one doesn't fix it.
I have to restart lightdm, and then I can log in again.
Once I have logged in through this restarted lightdm instance the background
image is completely black, but everything else is normal.
OS: Ubuntu 16.10 x86_64
Kernel: 4.8.0-28-generic
CPU: Intel i7-6700K (8) @ 4.2GHz
GPU: AMD Radeon RX 470/480
Memory: 2580MB / 32127MB
** Affects: xserver-xorg-video-amdgpu (Ubuntu)
Importance: Undecided
Status: New
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which is subscribed to xserver-xorg-video-amdgpu in Ubuntu.
https://bugs.launchpad.net/bugs/1647750
Title:
Black screen on RX480 when monitor awakes from standby
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