External Screen Problems

When connecting my laptop to my TV with an HDMI cable I encounter a number of problems:

  1. I like to have a higher DPI on my TV, but the setting only applies after restart. Is there any way to do this without restart?

  2. The audio does not automatically use the TV's speakers, but the laptop's instead. Can I get it to change automatically? How?

  3. After disconnecting my laptop from my TV, my laptop remains on external screen mode and my laptop's screen remains off. Can the display automatically change back to my screen.

I leave my laptop screen lid closed, while connecting my laptop to my TV. Has it got to do with that?

Any help would be much appreciated!

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