Tslib: mouse cursor moves in the opposite direction to selection box

touch screenxfcexorg

I'm using tslib/xf86-input-tslib on an ARM box with Debian 7. ts_calibrate and ts_test are working properly. The problems occur in Xfce. When I touch the screen and move the finger, I see, that mouse cursor is following my finger, but a selection box occurs with some offset to the Y-axis and then moves towards mouse cursor. My xorg.conf:

Section "InputDevice"
    Identifier "tslib"
    Driver "tslib"
    Option "Device"    "/dev/input/event1"
    Option "ScreenNumber"  "0"
    Option "Width" "0"
    Option "Height"    "0"
    Option "Rotate"    "NONE"
    Option "EmulateRightButton"    "1"
EndSection

Section "ServerLayout"
     Identifier      "Default Layout"
     InputDevice     "tslib" "CorePointer"
EndSection

tslib version is 1.1 and xf86-input-tslib from Ubuntu: https://code.launchpad.net/~ubuntu-branches/ubuntu/saucy/xf86-input-tslib/saucy

An USB mouse is working as expected.

cat /proc/bus/input/devices

I: Bus=0018 Vendor=0000 Product=fe2e Version=0100
N: Name="TPS6507x Touchscreen"
P: Phys=1-0048/input0
S: Sysfs=/devices/platform/omap/omap_i2c.1/i2c-1/1-0048/input/input1
U: Uniq=
H: Handlers=mouse0 event1
B: EV=b
B: KEY=400 0 0 0 0 0 0 0 0 0 0
B: ABS=1000003

How can I fix this behavior?

Best Answer

The problem is, that Xorg used both evdev and tslib driver for the same device.

Standard Xorg configuration files scan input devices and if it is a touchscreen, then evdev will used by default:

Section "InputClass"
    Identifier "evdev touchscreen catchall"
    MatchIsTouchscreen "on"
    MatchDevicePath "/dev/input/event*"
    Driver "evdev"
EndSection

Xorg seems not to check, if device is already used with another driver. That's why it used both drivers. The solution was to comment this section in /usr/share/X11/xorg.conf.d/10-evdev.conf.

Related Solutions

How to override custom mouse cursor with Xcursor

I have worked out how to do this. First, you have to set the XCURSOR_DISCOVER environment variable before running the program that is setting the mouse cursor, in my case, rdesktop:

$ XCURSOR_DISCOVER=1 rdesktop ...

This will then print out bitmaps and hashes of each cursor once only when they are set for the first time. Here is what it spat out when the default Windows cursor was set, which is the image I want to override:

Cursor image name: 24020000002800000528000084810000
...
Cursor image name: 7bf1cc07d310bf080118007e08fc30ff
...
Cursor hash 24020000002800000528000084810000 returns 0x0

When Xcursor looks for missing cursors, the search path includes ~/.icons/default/cursors so this is where we can place images for missing cursors.

$ mkdir -p ~/.icons/default/cursors

Now in here you just point any hash to an existing image. When an application tries to set the hash, that image will be used instead. In this case, we want the left_ptr image to be used (this is the default arrow) from the Vanilla-DMZ theme:

$ ln -s /usr/share/icons/Vanilla-DMZ/cursors/left_ptr ~/.icons/default/cursors/24020000002800000528000084810000

That's it! The change should be visible immediately.

Hiding the mouse cursor dynamically when using the touchscreen

You could use

To use, install it

sudo apt-get install unclutter

then run it

unclutter -idle 0.01 -root

Note that the number after idle means the time before it hides. In this case its set to 1/100 of a second. You could try change it to a value that it would always be hidden.

This will hide the cursor when you don't move it. I'm sure there is also an option to completely hide it.

Best Answer

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How to override custom mouse cursor with Xcursor

Hiding the mouse cursor dynamically when using the touchscreen

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