I was wondering if anyone has found a resolution to this problem. I am having the exact same issue w/ a Dell Inspiron. When the laptop is plugged in it basically goes black although if you look closely you can see that screen is still up but very very dark. If I unplug and close and reopen the cover it comes back up. Also noticed that when running on battery the screen somewhat changes brightness very slightly every few seconds. Almost like a slow motion flicker. When plugged into an external monitor it also works fine.
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