My Thinkpad W520 can only use the external screen (both RGB and Displayport) when running on nVidia.
Away on holidays I switched nVidia Prime to Intel.
Returned home I switched back to nVidia and after the log out/in I was met with a black screen.
Via the CLI on one of the terminals I switched Prime back to Intel.
And was able to get a normal screen.
Next I switched from nVidia-384.9 to 382.22 and returned to nVidia for the external screen.
All was well again.
Away on holidays I switched nVidia Prime to Intel.
Returned home I switched back to nVidia and after the log out/in I was met with a black screen.
Via the CLI on one of the terminals I switched Prime back to Intel.
Code:
sudo prime-select intel
Next I switched from nVidia-384.9 to 382.22 and returned to nVidia for the external screen.
All was well again.
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