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I have recently installed Ubuntu 20.04 on my laptop. When I connect to external screen and boost the ubuntu, the external screen can display, however the built-in screen remains in active black.

I still be able to drag the apps to the built-in one, thus I suspect it still functions but just not able to display. My laptop is ZenBook-UX431FN with Intel UHD Graphics 620 and GeForce MX 150 which builds on top of NVIDIA Optimus. I believe that's the cause of the trouble.

Can anyone help letting these two screens function? Thanks a lot.

Edit: Both monitors can be detected NVIDIA X Server as prime display, I can not adjust them.

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  • did you install any drivers, such as NVIDIA? Then use the NVIDIA settings. Otherwise would this answer help you? – kanehekili Jun 18 at 18:16
  • I have used NVIDIA driver and the setting, so I don't think that the issue is. I will try another method and get back to you. Thanks a lot ! – 張成志 Jul 1 at 4:12

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