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List:       kde-bugs-dist
Subject:    [krita] [Bug 371827] [BOSTO] Pen Pressure not working
From:       Aidan Walton <bugzilla_noreply () kde ! org>
Date:       2016-10-31 21:58:22
Message-ID: bug-371827-17878-UDEz0zy4tl () http ! bugs ! kde ! org/
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https://bugs.kde.org/show_bug.cgi?id=371827

--- Comment #5 from Aidan Walton <aidan.walton@gmail.com> ---
(In reply to Boudewijn Rempt from comment #3)
> Do you get any message like
> 
> "QApplication: Failed to get list of tablet devices" 
> 
> ?

Well, this is not so easy to fathom. 
If it helps and you have a chance, please take a look.

# xinput --list --long 11
Bosto Kingtee 22HD                              id=11   [slave  pointer  (2)]
        Reporting 5 classes:
                Class originated from: 11. Type: XIButtonClass
                Buttons supported: 7
                Button labels: "Button Unknown" "Button Unknown" "Button
Unknown" "Button Wheel Up" "Button Wheel Down" "Button Horiz Wheel Left"
"Button Horiz Wheel Right"
                Button state:
                Class originated from: 11. Type: XIValuatorClass
                Detail for Valuator 0:
                  Label: Abs X
                  Range: 0.000000 - 10206.000000
                  Resolution: 0 units/m
                  Mode: absolute
                  Current value: 7502.000000
                Class originated from: 11. Type: XIValuatorClass
                Detail for Valuator 1:
                  Label: Abs Y
                  Range: 0.000000 - 7422.000000
                  Resolution: 0 units/m
                  Mode: absolute
                  Current value: 5450.000000
                Class originated from: 11. Type: XIValuatorClass
                Detail for Valuator 2:
                  Label: Abs Pressure
                  Range: 0.000000 - 2048.000000
                  Resolution: 0 units/m
                  Mode: absolute
                  Current value: 0.000000
                Class originated from: 11. Type: XIValuatorClass
                Detail for Valuator 3:
                  Label: Abs Misc
                  Range: 0.000000 - 0.000000
                  Resolution: 0 units/m
                  Mode: absolute
                  Current value: 2.000000


We can see everthing needed including presure.


# tail -f /var/log/Xorg.0.log
[ 38062.162] (II) config/udev: Adding input device Bosto Kingtee 22HD
(/dev/input/mouse2)
[ 38062.162] (II) No input driver specified, ignoring this device.
[ 38062.162] (II) This device may have been added with another device file.
[ 38062.233] (II) config/udev: Adding input device Bosto Kingtee 22HD
(/dev/input/event5)
[ 38062.233] (**) Bosto Kingtee 22HD: Applying InputClass "evdev tablet
catchall"
[ 38062.233] (II) Using input driver 'evdev' for 'Bosto Kingtee 22HD'
[ 38062.233] (**) Bosto Kingtee 22HD: always reports core events
[ 38062.233] (**) evdev: Bosto Kingtee 22HD: Device: "/dev/input/event5"
[ 38062.233] (--) evdev: Bosto Kingtee 22HD: Vendor 0xb57 Product 0x9016
[ 38062.233] (--) evdev: Bosto Kingtee 22HD: Found absolute axes
[ 38062.233] (--) evdev: Bosto Kingtee 22HD: Found x and y absolute axes
[ 38062.233] (--) evdev: Bosto Kingtee 22HD: Found absolute tablet.
[ 38062.233] (II) evdev: Bosto Kingtee 22HD: Configuring as tablet
[ 38062.233] (**) evdev: Bosto Kingtee 22HD: YAxisMapping: buttons 4 and 5
[ 38062.233] (**) evdev: Bosto Kingtee 22HD: EmulateWheelButton: 4,
EmulateWheelInertia: 10, EmulateWheelTimeout: 200
[ 38062.233] (**) Option "config_info"
"udev:/sys/devices/pci0000:00/0000:00:0b.0/usb2/2-6/2-6:1.0/input/input76/event5"
[ 38062.233] (II) XINPUT: Adding extended input device "Bosto Kingtee 22HD"
(type: TABLET, id 11)
[ 38062.233] (II) evdev: Bosto Kingtee 22HD: initialized for absolute axes.
[ 38062.233] (**) Bosto Kingtee 22HD: (accel) keeping acceleration scheme 1
[ 38062.233] (**) Bosto Kingtee 22HD: (accel) acceleration profile 0
[ 38062.233] (**) Bosto Kingtee 22HD: (accel) acceleration factor: 2.000
[ 38062.233] (**) Bosto Kingtee 22HD: (accel) acceleration threshold: 4


Well its mapped by evdev for sure, but no mention of pressure? yet xinput shows
it. Alos udev maps the device as a generic mouse, as indeed it should. So the
question is for you is Qt recognising these Valuators.

I refer to this old bug:  https://bugreports.qt.io/browse/QTBUG-48370
Description
It's not detected as a tablet, so only works as a mouse.
[     0.001 D] unknown - input device  WALTOP International Corp. Slim Tablet
[     0.001 D] unknown -    has 13 buttons
[     0.001 D] unknown -    has valuator "Abs X" recognized? true
[     0.001 D] unknown -    has valuator "Abs Y" recognized? true
[     0.001 D] unknown -    has valuator "Abs Pressure" recognized? true
[     0.001 D] unknown -    has valuator "Rel Vert Wheel" recognized? true
[     0.001 D] unknown -    it's a scrolling device

So this was a Waltop tablet, as can be seen Qt seems to identify the needed
functions based on the Valuator Label: Abs Presssure.

And as you can see my xinput displays the exact same Valuator Label from my
Bosto.

I think there is nothing much more I can change in the driver. Any thoughts.

And while I may have your attention, the final Valutor Label: Abs Misc, I am
using to define the current tool. Either Pen or Eraser.

I send '2' for PEN and '10' for ERASER. I have no idea if you even take any
notice of this, but I could send other EV_ codes instead, or any value you
would like to see in this 'Abs Misc' Valuator.

This does seem to be the current Linux generic method for mapping a Tablet into
X, so I don't want to start hacking xconfigs if this can work out of the box.

Help if you can.
Thanks

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