(In reply to Kim Carlsen from comment #14)
> Created attachment 118836 [details]
> The master control interrupt lied
> 
> kernel output on a 
> Lenovo X1 Carbon (3rd gen) connected to a lenovo onelink pro dock

Outputting 2560x1440@60 works fine, outputting 3840x2160@60 produces no
picture on external monitor.

When removing the onelink prodock and connecting the dp cable directly
to the laptop then all resolutions works (3840x2160@60).

Whenever running xrandr it adds 36 lines to kernel log of 'The master
control interrupt lied'

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https://bugs.launchpad.net/bugs/1488719

Title:
  dmesg shows "[drm:gen8_irq_handler [i915]] *ERROR* The master control
  interrupt lied (SDE)!"

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