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Build Identifier: 

Tested and reproduced on Leap 42.3, Thumbleweed, Leap 15 beta. Dell Precision
7520, graphics card Radeon WX 4150 (switchable graphics card off). 3x external
display = 2x DVI, 1x VGA. After boot all 4 displays are ON (3x external +
laptop screen, even laptopn lid is closed). When laptop screen is disabled in
settings, also DVI2 port (one of the external displays) is disabled. Desktop
behaves like display is still on, it is possible to move windows there. In
settings it looks like enabled, but display is physically powered off. So all 4
displays must be used or only 2 external displays. Once laptop lid is open and
closed again, this causes disabling laptop screen and one of external displays
as well.

Switchable graphics is disabled in BIOS, only Radeon card is used. 

Reproducible: Always

Steps to Reproduce:
1.Dell Precision 7520 laptop with Radeon WX 4150, E-Port replicator, 3x
external display (2x DVI, 1xVGA)
2.Install OpenSUSE 42.3, Thumbleweed or Leap 15
3.Disable laptop screen in display settings
Actual Results:  
Disabling laptop displays causes disabling one of external displays - all 4
displays must be used or only 2 of them

Expected Results:  
Expected that only laptop display is disabled when it is set in display
settings, but also one of external displays is disabled (in mycase DVI2 port)

Tried to install AMD drivers, but the same behavior. Tested Ubuntu 17, the same
results. Ubuntu 18.04 beta, works properly with those displays! But not
possible to rearrange them (probably another bug in beta version of Ubuntu 18).