[Bug 107889] colors are wrong on one screen with Radeon RX Vega M GL and Kernel 4.18

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107889

            Bug ID: 107889
           Summary: colors are wrong on one screen with Radeon RX Vega M
                    GL and Kernel 4.18
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: mchehab at infradead.org

Created attachment 141508
  --> https://bugs.freedesktop.org/attachment.cgi?id=141508&action=edit
Picture with the 3 monitors. The colors at the center one are wrong

I have a 3 monitors setup on a NUC8i7HNK (with latest BIOS: 0049).

I'm currently using Kernel 4.17 + DRM patches for 4.18-rc1. Everything works
OK. However, upgrading the Kernel to 4.18.5 (kernel-4.18.5-200.fc28.x86_64)
causes that the center (and default) monitor to mangle colors. The same issue
also happens with upstream Kernel 4.18 vanilla.

I'm enclosing a picture of what's happening there.

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