Thought you might be interested in this product:
Its basically i PC in a flash drive size enclosure using a usb port for power and has hdmi output, bluetooth and wifi built in.
Rule #1 - Be Patient - Rule #2 - Don't ask when, if you don't contribute - Rule #3 - You have coding skills - LinuxMCE's small brother is available: http://www.agocontrol.com
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I did a fresh install off the previously mentioned snap. and after the reboot I got the following screen.
As you can see it uses only a small section of the screen and goes straight to the "if you can see and hear me" video.
I then popped into terminal and tried running the AVWizard and AVWizard Wrapper, I can get/set the settings there, but it doesnt seem to save them.
Is there any logs or other information that I can give you?
Try the usb-creator-gtk and let us know how good it works out.