Question Laptop monitor has black lines when connected to an external monitor

May 23, 2021
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I'm using an Asus GA502IV
many problems happen when I connect my laptop to my external monitor Dell U2312HM

sometimes it's a black bar, sometimes it's a few black lines. These lines do not appear at all if I unplug my external monitor
I use a Displayport to USB C connector and I'm not sure if that's the issue.
it also causes my mouse to sometimes start freezing
 
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