External monitor go black when fully charged

Hey guys, I have a fully working Dell E6440 running Big Sur with HDMI port patched, every works very smoothly until the battery is fully charged, the screen would go pitch black until I disconnect the charger which was pretty annoying, how can I fix this? Thanks guysSpecs:

Dell E6440

I7-4610M

12GB DDR3 RAM

AMD 8690M (disabled under macOS)

SSD: Samsung 860 EVO 250GB (Mac) + Samsung PM851 128gb mSATA (Windows)

submitted by /u/KhanhDoan9983
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