[Bug 201067] New: [bisected] [4.19-rc2 regression] Display corruption with Vega 64 in 4.19-rc2

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=201067

            Bug ID: 201067
           Summary: [bisected] [4.19-rc2 regression] Display corruption
                    with Vega 64 in 4.19-rc2
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.19-rc2
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: sarnex at gentoo.org
        Regression: No

Created attachment 278389
  --> https://bugzilla.kernel.org/attachment.cgi?id=278389&action=edit
dmesg

Hi all,

When using a kernel after the below commit, I get visual corruption only on the
right most vertical column of my screen:

Author: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>
Date:   Mon Jul 23 14:13:23 2018 -0400

    drm/amd/display: Use calculated disp_clk_khz value for dce110


Video: 
https://www.youtube.com/watch?v=HrJUrBWMRXU

Using a kernel without this commit does not have the issue.

My GPU is a Sapphire Nitro+ Vega 64. I am using Gentoo with Mesa git and KDE
Plasma 5.

My main monitor is connected over DP and runs at 2560x1440 at 144hz. My second
monitor is connected over HDMI and runs at 1920x1080 at 60hz. I tried disabling
the second monitor in KDE, but the issue still occurs.

It also occurs in fullscreen applications.

I will also attach dmesg.

I can test any patches or answer any questions.

Thanks,
Sarnex

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