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Basically what the title says, (through a dongle) the HDMI port seems to work when the macbook is plugged into the charger, but not on battery power. But it'll continue to work on battery if I plug it into the charger, plug in HDMI, and then remove the charger. Is this supposed to happen? I think it used to work fine on battery power but I'm unsure.
MacBook Pro 15", macOS 10.13
Try resetting NVRAM/PRAM http://support.apple.com/kb/ht1379
Try resetting the SMC https://support.apple.com/en-us/HT201295
Try resetting NVRAM/PRAM http://support.apple.com/kb/ht1379
Try resetting the SMC https://support.apple.com/en-us/HT201295
HDMI only works when plugged into the charger?
