Raspberry Pi

General information

On the first partition of your SD card, you will find a file named config.txt. This file allows you to tweak a lot of things like framebuffer resolution, overclocking, audio, and is documented here

Audio not working on some TVs

Some TVs send a wrong EDID saying that HDMI audio is not supported while in fact it is. You may need to force HDMI audio by uncommenting this line in the config.txt:

hdmi_drive=2

HDMI to DVI adaptor

If your RPi is not booting while using an HDMI to DVI adaptor, please remove this line from your config.txt:

hdmi_drive=2

HDMI to VGA adaptor

If you are using a HDMI to VGA adaptor on a Raspberry Pi 1 or 2 and you want to use the jack output for the sound you have to write in config.txt on the first partition of the SD card:

hdmi_ignore_edid_audio=1

So the board'll not use the HDMI sound output.

Composite output

Since Lakka version 3.5.1 it is possible to use CRT output. Here are examples for 240p mode:

Raspberry Pi 3

Add video=Composite-1:720x480@60e to cmdline.txt right after quiet (separate these statements with a space)

Raspberry Pi 4

In addition to the modification of cmdline.txt above, add enable_tvout=1 and dtoverlay=vc4-kms-v3d-pi4,composite=1 to config.txt.