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I was looking for software to control my LG monitor and I wanted to be able to have PIP or windows to have full screen YouTube that doesn't take over the whole screen. I managed to install BeterDisplay Pro and it did the trick. I had created a a virtual display, was able to have that floating on the main screen and was able to full screen Youtube. When the MacMini went to sleep and I moved the mouse to wake it I was presented with a black screen with the familure "Extend monitors" notification on the main screen. I was unable to move past this, or find a way to get to another screen. I was pressing play and stop and music worked so it was like the machine was on and functioning but the screen I could see wasn't the functioning screen. I had to power cycle the machine. When trying to start the Mac Mini again it would hang about 75% into loading. I eventually restarted it in safe mode. It looked OK albeit I didn't open BetterDisplay. I restarted the machine and again it hanged. I then restarted in safe mode, deleted BetterDisplay and restarted it. This time no issues. As I like the features I reinstalled BetterDisplay and as soon as I opened it the machine hung.. Would love to use this, or anything else if that exists. Looks to be a great app so I hope this might get fixed or at least help in improving it further. |
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Hi there - the problem might be that after sleep, the Mac treats your virtual screen as the main display and your connected real display (misidentified as a TV in your case) will show Sequoia's new default empty option, waiting for you to select what it should do with the connected display. But the question of course appears on the virtual screen which you don't see. To fix this, you need to change this setting to something else (your preferred setting) instead of "Ask What to Show": 
This should not be an issue with computer monitors, only with TVs but it might be that your LG monitor is somehow detected as a TV. |
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Note: according to my tests though this should not happen with TVs known to the system either as macOS should remember the setting - so there might be some other display identification issue as well - you might want to try resetting all display configuration under Settings/Displays/Overview/Reset All Display System Settings… 
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Hi there -
the problem might be that after sleep, the Mac treats your virtual screen as the main display and your connected real display (misidentified as a TV in your case) will show Sequoia's new default empty option, waiting for you to select what it should do with the connected display. But the question of course appears on the virtual screen which you don't see.
To fix this, you need to change this setting to something else (your preferred setting) instead of "Ask What to Show":
This should not be an issue with computer monitors, only with TVs but it might be that your LG monitor is somehow detected as a TV.