Weird behavior of MBP and external HP screen. When MBP is on battery - everything works perfect. But when power supply is connected to MBP - external HP screen is going black. "Monitor going to sleep" info is displayed. Interesting thing - when it happens, you can still see this external monitor as "active" in "This MAC..." -> "More info..." -> "Graphics/monitors" tab. And change this external monitor resolution in System preferences. It's like Mac is seeing this external monitor as active, but in fact the monitor is going to sleep. After disconnecting power supply, external monitor comes back immediately. Connected via mini display port -> HDMI adapter -> HDMI -> cable -> DVI.
Can you please advise anything to make possible working on this monitor while being connected to power socket?
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