[Bug 103953] [DC] Polaris10: Missing modes when enabling DC

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103953

            Bug ID: 103953
           Summary: [DC] Polaris10: Missing modes when enabling DC
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: freedesktop-bugzilla at dominik-paulus.de

Created attachment 135751
  --> https://bugs.freedesktop.org/attachment.cgi?id=135751&action=edit
dmesg with amdgpu.dc=1

I have a Dell U2713HM connected to a Radeon RX470 (MSI board, 'Radeon RX470
Gaming 4G') over dual-link DVI on Linux 4.15-rc1. When enabling DC (Kernel
commandline amdgpu.dc=1), the monitors native resolution of 2560x1440 is not
detected, when falling back to default modesetting, everything works fine.
Xorg.log and (relevant parts) of dmesg for both amdgpu.dc=1 and =0 are
attached.

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