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Adds joystick/udev troubleshooting information to README-linux.txt

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gabomdq committed Nov 14, 2013
1 parent dd325b9 commit 85dd689ff9d48f7adaee8328456c6677213c9c62
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  1. +48 −0 README-linux.txt
@@ -30,3 +30,51 @@ NOTES:
configure script to include DirectFB support. Send patches. :)


================================================================================
Joystick does not work
================================================================================

If you compiled or are using a version of SDL with udev support (and you should!)
there's a few issues that may cause SDL to fail to detect your joystick. To
debug this, start by installing the evtest utility. On Ubuntu/Debian:

sudo apt-get install evtest

Then run:

sudo evtest

You'll hopefully see your joystick listed along with a name like "/dev/input/eventXX"
Now run:

cat /dev/input/event/XX

If you get a permission error, you need to set a udev rule to change the mode of
your device (see below)

Also, try:

sudo udevadm info --query=all --name=input/eventXX

If you see a line stating ID_INPUT_JOYSTICK=1, great, if you don't see it,
you need to set up an udev rule to force this variable.

A combined rule for the Saitek Pro Flight Rudder Pedals to fix both issues looks
like:

SUBSYSTEM=="input", ATTRS{idProduct}=="0763", ATTRS{idVendor}=="06a3", MODE="0666", ENV{ID_INPUT_JOYSTICK}="1"
SUBSYSTEM=="input", ATTRS{idProduct}=="0764", ATTRS{idVendor}=="06a3", MODE="0666", ENV{ID_INPUT_JOYSTICK}="1"

You can set up similar rules for your device by changing the values listed in
idProduct and idVendor. To obtain these values, try:

sudo udevadm info -a --name=input/eventXX | grep idVendor
sudo udevadm info -a --name=input/eventXX | grep idProduct

If multiple values come up for each of these, the one you want is the first one of each.

On other systems which ship with an older udev (such as CentOS), you may need
to set up a rule such as:

SUBSYSTEM=="input", ENV{ID_CLASS}=="joystick", ENV{ID_INPUT_JOYSTICK}="1"

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