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I have a T11 working from factory, and it was fine until a W10 update (I think). Then it started to freeze and flick the screen. Checked monitor plug and power plug. Everything is fine.

So, I tried installing Ubuntu 20.04.1 LTS. It installs, login fine, and can start one or two things, but after a while, screen freezes and nothing works. It doesn't response.

It may be because you have entered sleep mode. Can you provide more information, such as a screenshot of a frozen screen?