No input driver specified for LBPS/2 Fujitsu Lifebook TouchScreen

[Peter Hutterer]

On Sun, Jan 02, 2022 at 06:23:22PM +0000, Koka Koko wrote:
> Hello, everyone!
> I face a problem with an old touchscreen in CF-18 using libinput and lubuntu 18.04 (Linux 5.4.0-91-generic)
> 
> My 40-libinput.conf has right (as it goes for me) section describing touchscreens:
> 
> Section "InputClass"
>         Identifier "libinput touchscreen catchall"
>         MatchIsTouchscreen "on"
>         MatchDevicePath "/dev/input/event*"
>         Driver "libinput"
> EndSection
> 
> But Xorg.0.log writes:
> 
> [    37.305] (II) config/udev: Adding input device LBPS/2 Fujitsu Lifebook TouchScreen (/dev/input/event6)
> [    37.305] (**) LBPS/2 Fujitsu Lifebook TouchScreen: Applying InputClass "libinput touchscreen catchall"
> [    37.305] (**) LBPS/2 Fujitsu Lifebook TouchScreen: Applying InputClass "calibration"
> [    37.306] (II) Using input driver 'libinput' for 'LBPS/2 Fujitsu Lifebook TouchScreen'
> [    37.306] (**) LBPS/2 Fujitsu Lifebook TouchScreen: always reports core events
> [    37.306] (**) Option "Device" "/dev/input/event6"
> [    37.306] (**) Option "_source" "server/udev"
> [    37.308] (II) event6  - LBPS/2 Fujitsu Lifebook TouchScreen: is tagged by udev as: Touchscreen
> [    37.324] (II) event6  - LBPS/2 Fujitsu Lifebook TouchScreen: device is a touch device
> [    37.324] (II) event6  - LBPS/2 Fujitsu Lifebook TouchScreen: device removed
> [    37.324] (**) Option "config_info" "udev:/sys/devices/platform/i8042/serio3/input/input11/event6"
> [    37.324] (II) XINPUT: Adding extended input device "LBPS/2 Fujitsu Lifebook TouchScreen" (type: TOUCHSCREEN, id 11)
> [    37.324] (**) Option "AccelerationScheme" "none"
> [    37.325] (**) LBPS/2 Fujitsu Lifebook TouchScreen: (accel) selected scheme none/0
> [    37.325] (**) LBPS/2 Fujitsu Lifebook TouchScreen: (accel) acceleration factor: 2.000
> [    37.325] (**) LBPS/2 Fujitsu Lifebook TouchScreen: (accel) acceleration threshold: 4
> [    37.327] (II) event6  - LBPS/2 Fujitsu Lifebook TouchScreen: is tagged by udev as: Touchscreen
> [    37.327] (II) event6  - LBPS/2 Fujitsu Lifebook TouchScreen: device is a touch device

 
Up to here it's about the event device. the device_removed message is a
side-effect of how the X server pre-inits and then later (read: immediately)
starts them. Nothing to worry about, this output looks coorrect.

> [    37.329] (II) config/udev: Adding input device LBPS/2 Fujitsu Lifebook TouchScreen (/dev/input/mouse1)
> [    37.329] (**) LBPS/2 Fujitsu Lifebook TouchScreen: Applying InputClass "calibration"
> [    37.329] (II) No input driver specified, ignoring this device.
> [    37.329] (II) This device may have been added with another device file.
> 
> You know, the last two lines looks very suspecious as well as the line [    37.324] which ends up with "device removed".

this is for the /dev/input/mouse1 device which shouldn't be added (and hasn't
been for the last decade or so).

> 
> At the same time, I see the device in the output of:
> 
> $ libinput list-devices
> -------------------------
> Device:           LBPS/2 Fujitsu Lifebook TouchScreen
>  Kernel:           /dev/input/event6
>  Group:            7
>  Seat:             seat0, default
>  Capabilities:     touch 
>  Tap-to-click:     n/a
>  Tap-and-drag:     n/a
>  Tap drag lock:    n/a
>  Left-handed:      n/a
>  Nat.scrolling:    n/a
>  Middle emulation: n/a
>  Calibration:      identity matrix
>  Scroll methods:   none
>  Click methods:    none
>  Disable-w-typing: n/a
>  Accel profiles:   n/a
>  Rotation:         n/a
> 
> and I get a somewhat stream of values by:
> 
> $ cat /dev/event6
> 
> Moreover, the touchscreen reacts to poking at the screen, but the mouse
> pointer moves along X-axes only (but withing the full range of the screen)
> somwhere at the bottom of the screen (over the panel line, thus I can see
> the icon of the pointer fully)
> 
> 1. Am I right in conclusion that libinput driver does not connect to the
>    device? But why a mouse pointer moves in this case? 
> 
> 2. How can I edit 40-libinput.conf to get libinput driver to operate
>    properly with LBPS/2 Fujitsu Lifebook TouchScreen?

your config is correct. It's probably a bug with the device itself or
something inside libinput. File a bug against libinput please with the 
`sudo libinput record` output attached for a short event sequence.

Cheers,
  Peter