Re: HUION tablet

[adr <adr%sdf.org@localhost>]

On Fri, 19 May 2023, Brett Lymn wrote:
> > Is somebody using it right now? Has somebody tryed it with the base
> > X?
>
> It is on my work queue but I am distracted with other things at the
> moment.

Well, I made it work and I can't believe it. AutoEmptyInput. This
obscure option I found by chance not documented in xorg.conf(5),
have to be turn off in the ServeLayout section. Now I remember why
I hated it so much to configure X11 years ago.

Whith this setting snippet:

Section "ServerLayout"
    Identifier "xorg configured"
    InputDevice "Hion Tablet"
    Option "AutoEmptyInput" "off"
EndSection
Section "InputDevice"
    Identifier "Hion Tablet"
    Driver "usbtablet"
    Option "Device" "/dev/uhid3"
    Option "Type" "stylus"
    Option "Mode" "Absolute"
EndSection

The usbtablet driver is loaded and the tablet is enabled:
[...]
[   203.458] (==) Using config file: "/etc/X11/xorg.conf"
[   203.458] (==) ServerLayout "xorg configured"
[   203.458] (==) No screen section available. Using defaults.
[   203.458] (**) |-->Screen "Default Screen Section" (0)
[   203.458] (**) |   |-->Monitor "<default monitor>"
[   203.458] (==) No monitor specified for screen "Default Screen Section".
        Using a default monitor configuration.
[   203.459] (**) |-->Input Device "Hion Tablet"
[   203.459] (==) Automatically adding devices
[   203.459] (==) Automatically enabling devices
[   203.459] (==) Not automatically adding GPU devices
[...]
[   203.461] (II) LoadModule: "usbtablet"
[   203.462] (II) Loading /usr/X11R7/lib/modules/input/usbtablet_drv.so
[   203.462] (II) Module usbtablet: vendor="X.Org Foundation"
[   203.462]    compiled for 1.21.1.8, module version = 1.1.0
[   203.462]    Module class: X.Org XInput Driver
[   203.462]    ABI class: X.Org XInput driver, version 24.4
[   203.462] (II) USB Tablet driver
[...]
[   203.673] (II) Using input driver 'usbtablet' for 'Hion Tablet'
[   203.673] (**) Hion Tablet: always reports core events
[   203.674] (**) Stylus: always reports core events
[   203.674] (**) Stylus device is /dev/uhid3
[   203.674] (**) Stylus is in absolute mode
[   203.674] (==) Stylus: threshold = 5
[   203.674] (==) Stylus: suppress = 2
[   203.674] (II) XINPUT: Adding extended input device "Stylus" (type: TABLET, id 6)
[   203.674] (**) Option "Device" "/dev/uhid3"
[   203.674] (--) USBT tablet X=0..24384, Y=0..15240, pressure=0..8191
[   203.674] (--) USBT Stylus pressure threshold=409, suppress=2
[...]

The parameters reported are correct, and the movements on the tablet
correspond to the screen, but when I touch the tablet with the
stylus the behaviour is odd (I can't really describe it, when using
azpainter if I move the stylus fast the lines are dotted, but in
the wm the behaivour doesn't correspond exactly as a repeated
click).

I'll experiment with the options of the driver. If other people
give some feedback with other devices, in base or pkgsrc xorg, it
will be great, I could discard if it is the server-driver
 or device-driver compatibility, etc.

Note that I'm using the code of xenocara, simply ./configure and
make inside xenocara/driver/xf86-input-usbtablet
and then copying src/.libs/usbtablet_drv.so to
/usr/X11R7/lib/modules/drivers/, I haven't changed anything.

adr