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A comment on Explaining 4K 60Hz Video Through USB-C Hub. Parent comment

Re:Explaining 4K 60Hz Video Through USB-C Hub by NoodleIncident on Thursday November 14, 2019 @01:40PM (#21538056)
Interesting; I have the S9 and I've done this by accident while charging, but the monitor only shows what's normally on the phone screen, it doesn't stretch to a "full desktop". The mouse does work though.

Is there some setting I need to enable on my phone, or is my setup just different in some way?

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Re:Explaining 4K 60Hz Video Through USB-C Hub by izacus on Thursday November 14, 2019 @03:05PM (#21538872)
It depends on a type of USB-C dongle I think - Samsung obviously recommends theirs, but it worked for me on my MacBook USB-C "dock" dongles with HDMI+ethernet+USB+power. IIRC you need the one that supplies power or you just get screen mirroring.

There's also a setting to switch between modes under Settings -> Connections -> More connection settings -> HDMI mode.

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