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how can I use an adafruit 800x400 touchscreen?
I have an adafruit 800x400 7 inch display USB powered with HDMI. I would normaly use
this set up, but the settings in /boot/config.txt seem to have no effect.

how can I explicitly set the resolution to the display?
what file do i need to use?
I am using the Debian 8.9 jessie of the tinker OS according to lsb_release -a

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