https://bugs.kde.org/show_bug.cgi?id=369244

            Bug ID: 369244
           Summary: External Monitor goes black when switched to portrait
                    mode
           Product: KScreen
           Version: 5.7.95
          Platform: openSUSE RPMs
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: common
          Assignee: se...@kde.org
          Reporter: tom.war...@kolabnow.com

I have a Lenovo Thinkpad T460 with an Intel i7-6600U chip, and two external
monitors connected to a docking station. Everything works fine if both external
monitors are configured in landscape mode in KScreen (i.e., no rotation).
However, once I put one of the monitors in portrait mode (90° rotation), it
turns black. I can see the mouse cursor on it, but windows on that monitor are
invisible. I also think that the right-click menu still works, but is
invisible, because of the following:

I right-click somewhere on a working monitor -> context menu appears
I right-click somewhere on a working monitor -> context menu disappears
I right-click somewhere on a non-working monitor -> no visible change
(invisible context menu appears?)
I right-click somewhere on a working monitor -> no visible change (invisible
context menu disappears?)

Reproducible: Always

Steps to Reproduce:
1. Configure an external monitor with rotation

Actual Results:  
Monitor turns black, nothing but the mouse cursor is visible

Expected Results:  
The desktop, windows and the right-click context menu are visible

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