[Bug 107823] [amdgpu/displayport] Blackscreen on native resolution

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Tue Sep 4 14:40:29 UTC 2018


            Bug ID: 107823
           Summary: [amdgpu/displayport] Blackscreen on native resolution
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: jan.burgmeier at unicon-software.com

Created attachment 141442
  --> https://bugs.freedesktop.org/attachment.cgi?id=141442&action=edit
dmesg with drm.debug=0x1e log_buf_len=1M


there seems to be some monitor/graphics card combination which lead to a black
In my case it is the native (1920x1080) resolution of a NEC EA223WM monitor and
a [AMD/ATI] Carrizo (rev 88). Setting any other mode than the native one via
xrandr turns the monitor on. Setting it back to the native one results in a
black screen.
It seems unrelated to XOrg as there is also a black screen on the terminal and
during boot.
I do not see any errors in dmesg or XOrg log

The error does not occur with module parameter dc=0

Kernel: 4.19.0-rc2 (git master)
Mesa: 18.1.6
XOrg: 1.20.1
amdgpu-ddx: 18.0.99 (git master)

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