Comment 5 for bug 1920674

The problem I reported here was NOT fixed by the latest kernel update (5.4.0-71).

To clarify what I observe on my AMD-based desktop:
The suspend/hibernation/resume problem seems to be strictly related to the amdgpu kernel module and possibly also amdgpu Xorg driver. I have tested the following scenarios.

1) kernel 5.4.0-71 with ACP enabled:
 - Xorg vesa driver loaded & no acceleration
 - suspend seems ok but fails on resume
 - hibernation/resume ok

2) kernel 5.4.0-71 with ACP disabled:
 - Xorg amdgpu driver loaded & acceleration working
 - suspend/resume ok
 - hibernation fails

3) kernel 5.8.0-49 with ACP disabled:
 - Xorg amdgpu driver loaded & acceleration working
 - suspend/resume ok
 - hibernation fails

4) kernel 5.8.0-49 with ACP enabled:
 - I only get black screen - Xorg fails to start?
 - suspend/hibernation not tested

I have no problems with hibernation/suspend/resume on any of my Intel-based laptops. I also have no problem on most of my older AMD-based desktops.