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Bad projector output

I have a problem when the Tinkerboard output to the connected projector very bad. All the diagonal and circle line are broken.
My projector is Epson EB-1780W, resolution 1280x800.
I am using Android Tinkerboard and using the command line shell wm resize 1280x800 to adjust the resolution.

We tested the output picture from a mini PC and it is far better than Tinkerboard. Did we miss any configuration or is it the limit of Tinkerboard?

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