[Bug 199925] New: system-freeze with amdgpu.dc=1 & HDMI-Output

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https://bugzilla.kernel.org/show_bug.cgi?id=199925

            Bug ID: 199925
           Summary: system-freeze with amdgpu.dc=1 & HDMI-Output
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.17
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@xxxxxxxxxxxxxxxxxxxx
          Reporter: thomas.j.wegele@xxxxxxxxx
        Regression: No

Created attachment 276323
  --> https://bugzilla.kernel.org/attachment.cgi?id=276323&action=edit
dmesg error when connecting tv via hdmi

Booting 4.17 kernel (with amdgpu.dc=1 )with HDMI-TV connected results in
system-freeze (unable to ssh / change tty, etc)

If I connect the tv after logging into a graphical session (gnome 3.28) i get a
video-signal.

When I select HDMI-Audio output with pavucontrol (since it's not even listed in
Gnome) my system will still freeze.

Trying to play some audiofile with aplay -D on that device will also freeze my
system (sometimes even just aplay -l will cause a freeze)

I have attatched the dmesg-output after connecting the tv with hdmi

my system:

 Kernel: 4.17.0
 DE: GNOME 3.28.2
 CPU: Intel Core i5-4690S
 GPU: AMD Radeon R9 290

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