I noticed, that the Resolution is always scaled to a resolution of 1280x720.
It doesn't matter which resolution you configured in the settings.
The problem with this scaling is that 1080p-playback makes no sense if it will be scaled down to 720p.
You can check that if you read the framebuffer-settings with this command(via ADB):
fbset -fb /dev/graphics/fb2
Or just take a Screenshot.
I hope this will be fixed because it's a no go.