[Bug 201795] New: [Regression] Wrong 4k resolution detected with DisplayPort to HDMI adapter on amdgpu - bugzilla-daemon

From: bugzilla-daemon@bugzilla.kernel.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 201795] New: [Regression] Wrong 4k resolution detected with DisplayPort to HDMI adapter on amdgpu
Date: Tue, 27 Nov 2018 19:30:46 +0000	[thread overview]
Message-ID: <bug-201795-2300@https.bugzilla.kernel.org/> (raw)

https://bugzilla.kernel.org/show_bug.cgi?id=201795

            Bug ID: 201795
           Summary: [Regression] Wrong 4k resolution detected with
                    DisplayPort to HDMI adapter on amdgpu
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.19.4
          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: thomas.lassdiesonnerein@gmx.de
        Regression: No

Created attachment 279677
  --> https://bugzilla.kernel.org/attachment.cgi?id=279677&action=edit
xrandr output on kernel 4.14

I have a AMD Fury X GPU connected to two 4k monitors.
- one 4k iiyama monitor @DP 1.4
- one 4k LG OLED TV @DP 1.4 to HDMI 2.0 Adapter

both have physical 3840x2160 pixels.

On Kernel 4.14 (Manjaro) I can mirror the screen fine. 

Newer Kernels I tested (4.17 to 4.19) mirror too, but on the LG OLED TV with
4096x2160 instead of 3840x2160. The latter res then is not stretched correctly.
I have small black bars left and right as if the driver thinks I would have
4096x2160 physically.If I set 4096x2160 in plasma5 it stretches fine, but then
I have different resolutions on boths screens which is problematic while
mirroring.

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