[Bug 206021] New: AMDGPU/DC: freesync disabled on the monitor side after the monitor sleeps and resumes

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=206021

            Bug ID: 206021
           Summary: AMDGPU/DC: freesync disabled on the monitor side after
                    the monitor sleeps and resumes
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.4
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: libcg at protonmail.com
        Regression: No

Created attachment 286525
  --> https://bugzilla.kernel.org/attachment.cgi?id=286525&action=edit
Freesync ON

linux 5.4.6
xorg-server 1.20.6
xf86-video-amdgpu 19.1.0
mesa 19.3.1
gnome-shell 3.34.2
R9 Fury
Samsung C27HG70 with 1023.0 firmware

Steps to reproduce:
- Hit Super+L to lock screen
- Wait for the monitor to turn off (blinking status LED)
- Wake up screen by hitting any key

Before going to sleep, the monitor will show that Freesync is active in the OSD
(see freesync_on.jpg attachment). After sleep, Freesync will be disabled in the
OSD (see freesync_off.jpg). However the driver still thinks Freesync is active:
in games, the screen will turn blank when the framerate goes below 144Hz. It's
possible to recover by replugging the displayport cable or by manually powering
the monitor off and back on.

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