Handheld Control Panel v1.0 Released in Late May & supports GPD Win 4
Releases · project-sbc/Handheld-Control-Panel
https://github.com/project-sbc/Handheld-Control-Panel/releases
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If you aren't using it already with your GPD Win 4, I highly recommend HCP -- it is a great and customizable tool for managing TDP, resolution, framerate, etc.