Testing

This page list some ways to test the framebuffer drivers. All commands are issued from a SSH session.

X server

Install framebuffer driver

sudo apt-get install xserver-xorg-video-fbdev

Create file: /usr/share/X11/xorg.conf.d/99-fbdev.conf

Section "Device"  
  Identifier "myfb"
  Driver "fbdev"
  Option "fbdev" "/dev/fb1"
EndSection

Start X server

startx

Source: blogpost

mplayer

WIDTH is the display width.
scale is used because the movie is larger than most small displays. -3 means keep aspect ratio and calculate height.

apt-get install -y mplayer
wget http://fredrik.hubbe.net/plugger/test.mpg

mplayer -nolirc -vo fbdev2:/dev/fb1 -vf scale=WIDTH:-3 test.mpg

Image viewer

apt-get -y install fim
wget http://www.olsug.org/wiki/images/9/95/Tux-small.png

FRAMEBUFFER=/dev/fb1 fim Tux-small.png

Console

Use display as the primary console.
If a keyboard is plugged in after power on, a reboot may be necessary.

# Map console 1 to framebuffer 1, login screen will show up on the display
con2fbmap 1 1

con2fbmap 1
console 1 is mapped to framebuffer 1

# Revert
con2fbmap 1 0

fbtest

Framebuffer Test suite by Geert Uytterhoeven

apt-get install libnetpbm10-dev
git clone https://git.kernel.org/pub/scm/linux/kernel/git/geert/fbtest.git
cd fbtest
# fb.c - remove #include <asm/page.h>
make
./fbtest --fbdev /dev/fb1

The benchmarking numbers are not valid. They only report video memory writing speed. The drivers update the display at a fixed rate (deferred_io).

fbtft_test

This project has some tests: https://github.com/notro/fbtft_test

Debug

To get debug output, add to the top of sourcefile: #define DEBUG
For drivers supporting dynamic debug see Debug