Depending on the display and backlight current between 400 to 1000mA. For the Raspberry Pi we recommend at least a 5V 2A power supply. If you have problems like a flickering screen, then check your USB cables. Some cables have very thin wires and so there is a voltage drop >0.5V on the cable.
In general all boards/computers with a HDMI output can drive the display and the respective settings are loaded from the EDID EEPROM (empty on new adapters) automatically. If there are any problems, then the settings can be made manually. For example the Raspberry Pi ignores no standard display timings. Infos about setting the display timings can be found here: Raspberry Pi, BeagleBone, CubieBoard, ODROID, UDOO
The touchpanel acts as USB HID mouse with absolute coordinates. So you do not need a special driver. An inversion/rotation of the coordinates can be done via the serial interface command ATS6.
All displays with the standard 40 pin connector (parallel RGB interface) are compatible. If the display has a touchpanel please make sure the jumpers are in the right position and the correct firmware is on the ATmega32u4 microcontroller, before connecting the screen. Here is a Displays Compatibility List with further infos and the jumper settings can be found in the schematics PDF file.
Further infos (e.g. ghost images) about displays can be found here.
The font can be changed with console-setup or edit the file /etc/default/console-setup.
$ sudo dpkg-reconfigure console-setup
Encoding to use on the console: <UTF-8>
Character set to support: <Guess optimal character set>
Font for the console: Terminus (default is VGA)
Font size: 6x12 (framebuffer only)
Debian Wheezy
Open evdev.conf
$ nano /etc/X11/xorg.conf.d/evdev.conf
and add the following section:
Section "InputClass"
Identifier "Touchscreen"
MatchProduct "ATmega32u4 USB IO Board"
Driver "evdev"
Option "EmulateThirdButton" "1"
Option "EmulateThirdButtonButton" "3"
Option "EmulateThirdButtonTimeout" "1000"
Option "EmulateThirdButtonMoveThreshold" "30"
EndSection
Debian Jessie
The EmulateThirdButton option has be removed from Jessie and as workaround twofing can be used: Installation Guide, Source Code
You can install Florence Virtual Keyboard or Matchbox Virtual Keyboard with the following commands:
$ sudo apt-get install florence
$ sudo apt-get install matchbox-keyboard
The Qt plugin evdevtouch is not working with the touchpanel, please use tslib.
Kodi needs access to the input devices and this can be done by creating the following rule. The mouse device also has to use screen coordinates: (serial command ATS6=8).
Open/create 99-input.rules
$ nano /etc/udev/rules.d/99-input.rules
and add the following rules:
SUBSYSTEM=="input", GROUP="input", MODE="0660"
KERNEL=="tty[0-9]*", GROUP="tty", MODE="0660"
If there are problems with the display output, then add the line hdmi_drive=1 to /boot/config.txt.
When using displays with onboard backlight boost regulators the backlight can be switched off when the HDMI output is deactivated.
If you get a wrong image, when you power on the HDMI output then add the line hdmi_drive=1 to the file /boot/config.txt.
HDMI off
$ tvservice -o
HDMI on
$ tvservice -p
$ fbset -depth 8
$ fbset -depth 16
$ xrefresh
The EEPROM (I2C) is empty on new adapters and can be flashed via the ATmega32u4 Microcontroller. Further infos on the programming can be found here. To modify the EDID data under a Windows OS you can use Raylar’s Phoenix EDID Designer.