Deskhop does not work with new Keychron V6 Ultra Keyboard wired or with dongle

[apastuszak]

The new Keychron Ultra line moved from QMK firmware to ZMK firmware. I cannot get my V6 Ultra to work with the Desktop running version 0.78 in wired or wireless mode.

[hrvach]

Hey, can you please dump the hid descriptor for the keyboard? I'm curious to know what's breaking it and if there is a bug that we can fix. Thanks!

[apastuszak]

Output from mac-hid-dump

3434 0C60: Keychron - Keychron V6 Ultra 8K
DESCRIPTOR:
05 8c 09 01 a1 01 85 b1 09 02 15 00 26 ff 00 75
08 95 20 81 02 85 b2 09 03 95 20 75 08 15 00 26
ff 00 91 02 c0

I ran it through the USB Descriptor site and it came back with this:

0x05, 0x8C, // Usage Page (Bar Code Scanner Page)
0x09, 0x01, // Usage (0x01)
0xA1, 0x01, // Collection (Application)
0x85, 0xB1, // Report ID (-79)
0x09, 0x02, // Usage (0x02)
0x15, 0x00, // Logical Minimum (0)
0x26, 0xFF, 0x00, // Logical Maximum (255)
0x75, 0x08, // Report Size (8)
0x95, 0x20, // Report Count (32)
0x81, 0x02, // Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x85, 0xB2, // Report ID (-78)
0x09, 0x03, // Usage (0x03)
0x95, 0x20, // Report Count (32)
0x75, 0x08, // Report Size (8)
0x15, 0x00, // Logical Minimum (0)
0x26, 0xFF, 0x00, // Logical Maximum (255)
0x91, 0x02, // Output (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position,Non-volatile)
0xC0, // End Collection

// 37 bytes

Mac System Information shows this:

Keychron V6 Ultra 8K:

Location ID: 0x08421000
Connection Type: Removable
Manufacturer: Keychron
Serial Number: 0123456789ABCDEF
Link Speed: 480 Mb/s
USB Vendor ID: 0x3434
USB Product ID: 0x0c60
USB Product Version: 0x0100
Power Allocated: 2.5 W (500 mA)

[apastuszak]

Info for Keychron dongle

Output from mac-hid-dump

3434 D028: Keychron - Keychron Ultra-Link 8K
DESCRIPTOR:
  05  01  09  02  a1  01  85  01  09  01  a1  00  05  09  19  01
  29  05  15  00  25  01  95  05  75  01  81  02  95  01  75  03
  81  01  05  01  09  30  09  31  16  01  80  26  ff  7f  75  10
  95  02  81  06  09  38  15  81  25  7f  75  08  95  01  81  06
  05  0c  0a  38  02  15  81  25  7f  75  08  95  01  81  06  c0
  c0
  (81 bytes)

USB Descriptor site

0x05, 0x01,        // Usage Page (Generic Desktop Ctrls)
0x09, 0x02,        // Usage (Mouse)
0xA1, 0x01,        // Collection (Application)
0x85, 0x01,        //   Report ID (1)
0x09, 0x01,        //   Usage (Pointer)
0xA1, 0x00,        //   Collection (Physical)
0x05, 0x09,        //     Usage Page (Button)
0x19, 0x01,        //     Usage Minimum (0x01)
0x29, 0x05,        //     Usage Maximum (0x05)
0x15, 0x00,        //     Logical Minimum (0)
0x25, 0x01,        //     Logical Maximum (1)
0x95, 0x05,        //     Report Count (5)
0x75, 0x01,        //     Report Size (1)
0x81, 0x02,        //     Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x95, 0x01,        //     Report Count (1)
0x75, 0x03,        //     Report Size (3)
0x81, 0x01,        //     Input (Const,Array,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x05, 0x01,        //     Usage Page (Generic Desktop Ctrls)
0x09, 0x30,        //     Usage (X)
0x09, 0x31,        //     Usage (Y)
0x16, 0x01, 0x80,  //     Logical Minimum (-32767)
0x26, 0xFF, 0x7F,  //     Logical Maximum (32767)
0x75, 0x10,        //     Report Size (16)
0x95, 0x02,        //     Report Count (2)
0x81, 0x06,        //     Input (Data,Var,Rel,No Wrap,Linear,Preferred State,No Null Position)
0x09, 0x38,        //     Usage (Wheel)
0x15, 0x81,        //     Logical Minimum (-127)
0x25, 0x7F,        //     Logical Maximum (127)
0x75, 0x08,        //     Report Size (8)
0x95, 0x01,        //     Report Count (1)
0x81, 0x06,        //     Input (Data,Var,Rel,No Wrap,Linear,Preferred State,No Null Position)
0x05, 0x0C,        //     Usage Page (Consumer)
0x0A, 0x38, 0x02,  //     Usage (AC Pan)
0x15, 0x81,        //     Logical Minimum (-127)
0x25, 0x7F,        //     Logical Maximum (127)
0x75, 0x08,        //     Report Size (8)
0x95, 0x01,        //     Report Count (1)
0x81, 0x06,        //     Input (Data,Var,Rel,No Wrap,Linear,Preferred State,No Null Position)
0xC0,              //   End Collection
0xC0,              // End Collection

// 81 bytes

// best guess: USB HID Report Descriptor

Mac System Information

Keychron Ultra-Link 8K:

  Location ID:	0x08423000
  Connection Type:	Removable
  Manufacturer:	Keychron
  Serial Number:	Not Provided
  Link Speed:	480 Mb/s
  USB Vendor ID:	0x3434
  USB Product ID:	0xd028
  USB Product Version:	0x0106
  Power Allocated:	2.5 W (500 mA)