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Arcom Embedded Linux Technical Manual The X Window System

The X Window System

AEL makes use of the X.Org release of X11R7.0. This has numerous utilities, certain

libraries, almost all fonts, and support for some X extensions omitted to reduce the

footprint.

You can start the X server on the primary display device by running the command

startx.

Refer to ftp.x.org/pub/X11R7.0/doc/html

for details about configuring the X server, and

to the board QuickStart Manual for board-specific details about display or input devices.

Window manager

By default, AEL comes installed with the standalone version of the matchbox window

manager. The regular version of matchbox is available on the Development Kit CD, and

can be installed to provide a more fully featured environment. The matchbox window

manager is specifically designed to require very few resources. It aims to target

systems with little screen real estate and limited input mechanisms (such as a

touchscreen). To support these aims, all windows remain maximized at all times (unlike

other window managers, which allow you to arbitrarily choose position and size).

AEL is not supplied with any other window managers. You may, however, choose to

build and install another window manager. Alternative window managers (and other

applications) can be started by editing the /etc/X11/xinit/xinitrc shell script.

Using a touchscreen

For information about calibrating and configuring touchscreen devices, see

Calibrating touchscreens

, page 23.

Touchscreens are supported via the tslib input driver and are configured with an

“InputDevice” stanza in the /etc/X11/xorg.conf configuration file:

Section "InputDevice"

Identifier "Touchscreen"

Driver "tslib"

Option "Device" "/dev/input/event2"

Option "AlwaysCore" "True"

EndSection

[...]

Section "ServerLayout"

[...]

InputDevice "Touchscreen"

EndSection

The Device option specifies the input event device provided by the touchscreen driver.

The AlwaysCore option enables the touchscreen as a core pointer (i.e. it can be used

to control the pointer) in addition to any other core pointer devices (such as mice).

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