Wacom Intuos BT S - not detected, Linux Mint 21.1

[mateimm]

• Device name: Wacom Intuos BT S

• Device model identifier: CTL-4100WL

• libwacom version: -- not sure how I could check that

• [X ] I understand that libwacom does affect whether the device works (see Troubleshooting)

Bug description

Hello,

I am having issues with my tablet

Name=Wacom Intuos BT S
ModelName=CTL-4100WL

I have not used it in some time and before today it was working fine.

I can connect it to the Bluetooth but is not detected in the Graphics Tablet application.

I am using a Linux Mint 21.1 OS

Using command libwacom-list-devices
I see it listed as:

- { bus: 'bluetooth', vid: '0x056a', pid: '0x0377', name: 'Wacom Intuos BT S' }
- { bus: 'bluetooth', vid: '0x056a', pid: '0x03c6', name: 'Wacom Intuos BT S' }

I have checked $ ll /usr/share/libwacom
and I can find my model under the name intuos-s-p3-wl.tablet
Looking inside this file I see the above vid:pid listed at the DeviceMatch as below:
DeviceMatch=usb:056a:0376;bluetooth:056a:0377;usb:056a:03c5;bluetooth:056a:03c6

I am still not sure what's wrong and why it can't be detected.

Any help would be much appreciated.
Thank you,
Matei

[whot]

libwacom-list-local-devices does not show it?

Does it show up with e.g. libinput record?

[mateimm]

libwacom-list-local-devices does not show it?

Does it show up with e.g. libinput record?

I get the below both with the tablet connected or disconnected from bluetooth:

$ libwacom-list-local-devices
Failed to find any devices known to libwacom.

[whot]

Does it show up with e.g. libinput record?

[whot]

/close

Closing, can't proceed without any information

[illya-laifu]

Not sure if this needs to be reopened, or if I need to create a new issue as this one was closed.

But I have the same situation with my tablet of the same model and name, both with USB and Bluetooth.

The tablet is property identified via dmesg:

[176709.526664] usb 7-1: USB disconnect, device number 3
[176714.567008] usb 7-1: new full-speed USB device number 4 using xhci_hcd
[176714.731921] usb 7-1: New USB device found, idVendor=056a, idProduct=03c5, bcdDevice= 2.07
[176714.731924] usb 7-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[176714.731926] usb 7-1: Product: Intuos BT S
[176714.731927] usb 7-1: Manufacturer: Wacom Co.,Ltd.
[176714.731928] usb 7-1: SerialNumber: 2DK00S2006429

However this device is not listed using libwacom-list-local-devices, libinput record, nor it appears in /proc/bus/input/devices.

[illya-laifu]

Poked around a bit and read a few existing issues, I got it working but I am not entirely sure it's correct.

The issue was that the tablet was running in "PC Mode" as indicated by the ID pair: 056a:03c5. Holding down buttons documented here, switches it to the android mode. It can be seen in lsusb as indicated by the change of the vendor ID in the ID pair: 2d1f:03c5.

Switching to the android mode also allows the device to be seen via libwacom-list-local-devices

devices:
- name: 'Wacom Intuos BT S (Android Mode)'
  bus: 'usb'
  vid: '0x2d1f'
  pid: '0x03c5'
  nodes: 
  - /dev/input/event260: 'Wacom Co.,Ltd. Intuos BT S'
  styli:
   - id: 0x862
     name: 'Intuos Pen'
     type: 'general'
     axes: ['x', 'y' , 'distance', 'pressure']
     buttons: 2
     erasers: []

My question is - shouldn't this tablet be seen in both modes, or just the PC mode and not the android mode?

[whot]

My question is - shouldn't this tablet be seen in both modes, or just the PC mode and not the android mode?

iirc the android mode of the tablet does not work that well under linux because the device behaves (subtly?) different, which is probably why it exists in the first place. libwacom could detect it in this mode (it's just a static description of the device after all) but that won't help with all the other issues that follow on. So IMO it's not worth it.

[illya-laifu]

Right, but the question still remains of why the regular mode is not detected.

Both ID sets are present in the output of libwacom-list-devices and yet only one (android) is detected.

Android mode:

dmesg:

[200183.519435] usb 7-1: new full-speed USB device number 19 using xhci_hcd
[200183.683355] usb 7-1: New USB device found, idVendor=056a, idProduct=03c5, bcdDevice= 2.07
[200183.683358] usb 7-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[200183.683360] usb 7-1: Product: Intuos BT S
[200183.683361] usb 7-1: Manufacturer: Wacom Co.,Ltd.
[200183.683362] usb 7-1: SerialNumber: 2DK00S2006429

libwacom

> libwacom-list -local-devices
devices:
- name: 'Wacom Intuos BT S (Android Mode)'
  bus: 'usb'
  vid: '0x2d1f'
  pid: '0x03c5'
...
libwacom-list-devices  | rg "2d1f.*03c5"
- { bus: 'usb',       vid: '0x2d1f', pid: '0x03c5', name: 'Wacom Intuos BT S (Android Mode)', uniq: '(null)' }

Standard mode

dmesg

[200702.789683] usb 7-1: New USB device found, idVendor=056a, idProduct=03c5, bcdDevice= 2.07
[200702.789687] usb 7-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[200702.789688] usb 7-1: Product: Intuos BT S
[200702.789689] usb 7-1: Manufacturer: Wacom Co.,Ltd.
[200702.789690] usb 7-1: SerialNumber: 2DK00S2006429

libwacom

> libwacom-list-local-devices
Failed to find any devices known to libwacom.
...
> libwacom-list-devices  | rg "056a.*03c5"
- { bus: 'usb',       vid: '0x056a', pid: '0x03c5', name: 'Wacom Intuos BT S', uniq: '(null)' }

[whot]

Can you try #825 please? Let's see what it actually sees, the code for this is simple enough that there's no good reason it should miss the device (assuming working udev and whatnot)

[illya-laifu]

No luck here - there is no extra output. I've peppered the code with fprints to help me with debugging, and , I believe, that pointed me into the right direction.

While the device is in Android mode, /dev/input/ has two extra devices, compared to the Standard mode. So there is nothing wrong with the libwacom, it's just that my OS does not detect those devices.

Since this is not relevant to libwacom, would you be able to point me to somewhere this is related to?

[whot]

Oh, I just noticed: Failed to find any devices known to libwacom.. If that's all you get none of your your devices have ID_INPUT_TABLET set which points at a broken udev install. Not sure how and why this is only an issue in the PC mode.

If the tablet was simply missing from libwacom you should see a is a tablet but not supported by libwacom message. Are you on Mint like the original reporter?

[illya-laifu]

I am not on Mint, but I think I understand why you are asking this question - kernel modules, which leads me to a solution (?) that immediately raises a few questions. I will list them out, just in case.

1. Loading wacom kernel module via modprobe fails silently and no module is loaded, but insmod with the absolute path of the module listed from modinfo wacom works. (This could possibly be caused by my odd Linux installation, but I doubt)
2. Output of the usb-devices shows Wacom tablets using usbhid as their driver, shouldn't that be wacom?
3. The fact that the Android mode worked without the module while the standard one didn't is perplexing.

[whot]

The fact that the Android mode worked without the module while the standard one didn't is perplexing.

I'm guessing the android mode is explicitly designed to work without the wacom drivers since it's likely android devices do not ship those. Check the DRIVER udev property on the device's hid node, that should list DRIVER=wacom. usb-devices seems to only list the driver as seen by the usb subsystem which is a level too deep.

Either way, this definitely looks like a local issue now, doubly so since you're using a different system than the original reporter. If you have an "odd Linux installation" then that is something you'll need to fix locally, it's too hard guessing what specific combination can trigger this particular issue.