[Bug 206053] New: Lock screen Black after idle with amdgpu.dc=1

[Bug 206053] New: Lock screen Black after idle with amdgpu.dc=1

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=206053

            Bug ID: 206053
           Summary: Lock screen Black after idle with amdgpu.dc=1
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.19+
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: eutychios23@gmail.com
        Regression: No

Created attachment 286565
  --> https://bugzilla.kernel.org/attachment.cgi?id=286565&action=edit
mydmesg

I am having a system with rx 550 polaris using amdgpu kernel driver and Mesa
19.3+.
when the screen gets idle locked with
lightlocker,xscreensaver,xfce4-screensaver the screen cannot get signal back
and i get a black screen. The screen lockers work because if i enter my passwd
and press enter i can login in the desktop.

Additional info: If i lock/blank the screen manually and move them mouse the
screen gets the signal back like it should.Issue happens across Debian and Arch
distributions.Monitor is connected with an hdmi 2.0 cable.

Workaround: Adding amdgpu.dc=0 in grub resolves the issue for all screen
lockers in my system, but disables amd display code.

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