[Bug 208443] New: [amdpgu] NAVI10 shutting second display off causes video corruption/crash on kernels >=5.7.6

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=208443

            Bug ID: 208443
           Summary: [amdpgu] NAVI10 shutting second display off causes
                    video corruption/crash on kernels >=5.7.6
           Product: Drivers
           Version: 2.5
    Kernel Version: >=5.7.6
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: ironmikkl@gmx.net
        Regression: No

Created attachment 290103
  --> https://bugzilla.kernel.org/attachment.cgi?id=290103&action=edit
Kernel log when error occurs

I have a RX 5700 XT NAVI10 with (well almost) no problems but since kernel
5.7.6 came out there is a serious problem which makes the card practically
unusable. Kernel 5.7.7 brought no relief. With kernels <=5.7.5 all is OK.

The problem only occurs if I have both of my displays connected. One is a
monitor via DP, the other is a TV via HDMI. When I disable the TV so that I
only have my monitor active its screen shows some weird freezing behaviour and
sometimes goes completely grey for some seconds, then black and afterwards is
not really useable any more. If both displays stay active or only the TV is
active or I do not connect the TV in the first place there is no problem. I
have attached the kernel log for when the error triggers.

Some other info that may be of importance:
- kernel: gentoo-sources
- xfce4-4.14
- xorg-server-1.20.8

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