PenPower/Huion RemoteGo LCD

[Aqua1ung]

Let me apologize profusely for opening a new issue for the same device, but I realize that you guys are busy people, and may not afford the time to keep up with the deluge of posts in the previous thread, which is why we seem to be talking past each other. This post will summarize my progress in the matter of assimilating the RemoteGo LCD tablet into libwacom.

There are two goals to this quest:

1. Figure out the EVDEV_ABS_xx parameters in the hwdb.d/60-evdev.hwdb file:

# PenPower RemoteGo LCD RMGL01
evdev:input:b0003v256Cp5101*
 EVDEV_ABS_00=::?
 EVDEV_ABS_01=::?

2. Figure out a way to make the tablet show up in the "Wacom Tablet" section of Gnome settings, if possible.

Here is, again, what UCLogic reports about the tablet:

dad@DadsGram~/Downloads $ uclogic-decode < probe.txt
    |           Manufacturer: HUION
    |                Product: PenPower RemoteGo LCD Writing Pad
 64 |        Params block #1: ???????????????????????????????????????????????????????????????????????????????????????????????????
    |                          Max X: 8192
    |                          Max Y: 357
    |                   Max pressure: 2273
    |                     Resolution: 2048
    |
 79 |         Internal model: ???????????????????????????????????????????????????????????????????????????????????????????????????
 7b |         Buttons status: ???????????????????????????????????????????????????????????????????????????????????????????????????
 c8 |        Params block #2: ??s?????
    |                          Max X: 42000
    |                          Max Y: 29600
    |                   Max pressure: 8191
    |                     Resolution: 5080
    |
 c9 |       Firmware version: 05OEM_T219_220709

And here is a photo of the tablet box:

I have to confess that I find the UCLogic output quite confusing, which is why I keep pressing that you guys let me know what to make of it. In particular, I am not sure what to make of that block #1 and block #2 stuff: what's with all those Max values, and what's the deal with the two resolutions?

Many thanks, and, again, apologies for being so persistent. The good news, as I said, is that the system recognizes the tablet, and the stylus moves the computer cursor, which is more that I had ever hoped.

[whot]

Figure out the EVDEV_ABS_xx parameters in the hwdb.d/60-evdev.hwdb file:

measure it to get the right size in mm, then look at the libinput record output for ABS_X and ABS_Y. Resolution is (max - min)/size-in-mm for each axis separately. Should be 200 units/mm if the package doesn't lie, see this comment for the calculation.

Example from my touchpad which is 98mm: (3052 - 0)/98 == 31.4 hence a resolution of 31.

    # Event type 3 (EV_ABS)
    #   Event code 0 (ABS_X)
    #       Value        2606
    #       Min             0
    #       Max          3052
    #       Fuzz            0
    #       Flat            0
    #       Resolution     31

the params block #1 looks like the pen pressure so you can ignore that.

Figure out a way to make the tablet show up in the "Wacom Tablet" section of Gnome settings, if possible.

You need a .tablet file added to libwacom, as per the wiki

[github-actions]

Hi, there. I'm a bot and have been asked to have a look at this.

libwacom is a bunch of text files with a C API, and the information in those text files
is static fixed information that we cannot get from the device (e.g. the model name or which
button will produce which event code). It does not affect functionality directly, if the
tablet does not work this is either an issue with the kernel drivers, xf86-input-wacom
(if using X) or libinput/the desktop environment (if using Wayland). Please file the
issue with the component that most likely applies.

See also https://github.com/linuxwacom/libwacom/wiki/Troubleshooting
See also https://github.com/linuxwacom/libwacom/wiki/Adding-a-new-device

---

This is an automated comment created by a bot. Responding to the bot or mentioning it won't have any effect.

[Aqua1ung]

measure it to get the right size in mm,

I measured it, and it's precisely what the box says: 148x210 mm.

then look at the libinput record output for ABS_X and ABS_Y.

Here's what libinput record says:

    # Event type 3 (EV_ABS)
    #   Event code 0 (ABS_X)
    #       Value       18712
    #       Min             0
    #       Max         32767
    #       Fuzz            0
    #       Flat            0
    #       Resolution     20
    #   Event code 1 (ABS_Y)
    #       Value       12005
    #       Min             0
    #       Max         32767
    #       Fuzz            0
    #       Flat            0
    #       Resolution     30

Hence I am guessing that hwdb.d/60-evdev.hwdb should look like this:

# PenPower RemoteGo LCD RMGL01
evdev:input:b0003v256Cp5101*
 EVDEV_ABS_00=::156
 EVDEV_ABS_01=::221

Right? Or should I go with "200" for EVDEV_ABS_01, and ... what for EVDEV_ABS_00?

[whot]

00 is the x axis which is 210mm (not sure why the measurements on the package are height/width instead of width/height). So that hwdb entry you posted looks correct.