[Bug 78987] New: black screen when trying to enable external VGA screen on Trinity APU laptop

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78987

          Priority: medium
            Bug ID: 78987
          Assignee: dri-devel at lists.freedesktop.org
           Summary: black screen when trying to enable external VGA screen
                    on Trinity APU laptop
          Severity: major
    Classification: Unclassified
                OS: All
          Reporter: dev at lynxeye.de
          Hardware: Other
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Radeon
           Product: DRI

Created attachment 99447
  --> https://bugs.freedesktop.org/attachment.cgi?id=99447&action=edit
dmesg from failing machine

Plugging in an VGA monitor and trying to enable it results in black screen on
both the internal laptop display as well as the external VGA monitor.

The graphics is dead after this, I have not found any way to restore the
screen. However the machine is still responding to ssh and I was able to pick
up an quite interesting dmesg snapshot.

If you need me to test patches or need any other information, just ping me.

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