RPi HDMI LCD Touchscreen

Found 2 low cost '5 inch HDMI LCD Touchscreens'  800x480 on eBay...
 * https://www.google.be/#q=52pi+hdmi+usb+touch+screen 52piTechnology
 * http://www.waveshare.com/5inch-hdmi-lcd.htm WaveShare

HDMI 800x480 setting
Both work with the following code in /boot/config.txt (found here) config_hdmi_boost=4
 * 1) increase HDMI signal strength (just a black screen if not set!)

disable_overscan=1
 * 1) remove black borders

hdmi_cvt 800 480 60 6 0 0 0
 * 1) set specific CVT mode

hdmi_group=2 hdmi_mode=87
 * 1) set CVT as default

Touch & power
Here are some 'hints' to get them working... (user space drivers with /dev/uinput events injection)

52pi

 * Power & control via micro USB (0eef:0005 custom (?) /dev/hidraw* control; see dmesg)
 * -> https://github.com/derekhe/wavesahre-7inch-touchscreen-driver (python)
 * -> https://github.com/xofc/hidraw2uinput ('C')

WaveShare

 * Power & control through RPi P1 connector (SPI+CS1) (XPT2046 controller)
 * -> https://github.com/xofc/xpt2uinput