>> Apart from the two additional tests mentioned above, can you also
>> provide a log from when connecting the device using the following commit
>> that I just pushed to the ch341 branch:
>>
>> f341ee36198d ("dbg: ch341: add register dumps to probe")
>>
>> which provides dumps of the register settings during initialisation.
>> (Make sure ch341 dynamic debugging is not enabled to avoid cluttering
>> the log.)
>
> I'll send this in a followup, need to rebuild.
00018-gf341ee3:
Dec 19 13:51:13 willard kernel: usbcore: registered new interface driver ch341
Dec 19 13:51:13 willard kernel: usbserial: USB Serial support
registered for ch341-uart
Dec 19 13:51:23 willard kernel: usb 6-2: new full-speed USB device
number 10 using uhci_hcd
Dec 19 13:51:23 willard kernel: usb 6-2: New USB device found,
idVendor=1a86, idProduct=7523
Dec 19 13:51:23 willard kernel: usb 6-2: New USB device strings:
Mfr=0, Product=2, SerialNumber=0
Dec 19 13:51:23 willard kernel: usb 6-2: Product: USB2.0-Ser!
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: ch341-uart converter detected
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [00] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [01] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [02] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [03] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [04] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [05] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [06] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [07] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [08] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [09] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [0a] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [0b] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [0c] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [0d] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [0e] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [0f] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [10] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [11] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [12] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [13] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [14] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [15] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [16] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [17] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [18] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [19] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [1a] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [1b] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [1c] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [1d] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [1e] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [1f] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [20] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [21] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [22] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [23] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [24] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [25] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [26] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [27] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [28] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [29] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [2a] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [2b] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [2c] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [2d] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [2e] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [2f] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: init 0 0
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [00] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [01] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [02] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [03] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [04] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [05] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [06] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [07] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [08] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [09] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [0a] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [0b] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [0c] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [0d] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [0e] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [0f] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [10] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [11] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [12] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [13] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [14] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [15] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [16] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [17] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [18] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [19] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [1a] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [1b] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [1c] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [1d] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [1e] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [1f] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [20] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [21] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [22] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [23] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [24] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [25] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [26] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [27] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [28] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [29] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [2a] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [2b] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [2c] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [2d] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [2e] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [2f] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: write 0x31 0xb282
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [00] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [01] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [02] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [03] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [04] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [05] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [06] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [07] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [08] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [09] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [0a] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [0b] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [0c] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [0d] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [0e] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [0f] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [10] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [11] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [12] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [13] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [14] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [15] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [16] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [17] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [18] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [19] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [1a] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [1b] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [1c] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [1d] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [1e] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [1f] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [20] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [21] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [22] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [23] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [24] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [25] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [26] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [27] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [28] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [29] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [2a] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [2b] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [2c] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [2d] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [2e] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [2f] = 00
Dec 19 13:51:23 willard kernel: usb 6-2: ch341_dbg - [0x2518] = f1 00,
[0x1213] = 00 00 (pre version)
Dec 19 13:51:23 willard kernel: usb 6-2: ch341_dbg - [0x2518] = f1 00,
[0x1213] = 00 00 (post init-0)
Dec 19 13:51:23 willard kernel: usb 6-2: ch341_set_baudrate_lcr -
speed = 9600, lcr = c3, a = b202
Dec 19 13:51:23 willard kernel: usb 6-2: ch341_dbg - [0x2518] = f1 00,
[0x1213] = 00 00 (post init - lcr reset)
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [00] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [01] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [02] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [03] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [04] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [05] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [06] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [07] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [08] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [09] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [0a] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [0b] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [0c] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [0d] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [0e] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [0f] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [10] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [11] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [12] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [13] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [14] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [15] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [16] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [17] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [18] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [19] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [1a] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [1b] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [1c] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [1d] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [1e] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [1f] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [20] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [21] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [22] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [23] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [24] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [25] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [26] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [27] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [28] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [29] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [2a] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [2b] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [2c] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [2d] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [2e] = 00
Dec 19 13:51:23 willard kernel: ch341 6-2:1.0: [2f] = 00
Dec 19 13:51:23 willard kernel: usb 6-2: ch341-uart converter now
attached to ttyUSB0
Dec 19 13:51:36 willard kernel: usb 6-2: ch341_set_baudrate_lcr -
speed = 19200, lcr = c3, a = d902
Dec 19 13:51:36 willard kernel: usb 6-2: ch341_dbg - [0x2518] = f1 00,
[0x1213] = 00 00 (post init - lcr reset)
Dec 19 13:52:18 willard kernel: usb 6-2: ch341_set_baudrate_lcr -
speed = 19200, lcr = c0, a = d902
Dec 19 13:52:18 willard kernel: usb 6-2: ch341_dbg - [0x2518] = f1 00,
[0x1213] = 00 00 (post init - lcr reset)
Dec 19 13:52:40 willard kernel: usb 6-2: ch341_set_baudrate_lcr -
speed = 19200, lcr = c3, a = d902
Dec 19 13:52:40 willard kernel: usb 6-2: ch341_dbg - [0x2518] = f1 00,
[0x1213] = 00 00 (post init - lcr reset)
Dec 19 13:53:27 willard kernel: usb 6-2: ch341_set_baudrate_lcr -
speed = 19200, lcr = c3, a = d902
Dec 19 13:53:27 willard kernel: usb 6-2: ch341_dbg - [0x2518] = f1 00,
[0x1213] = 00 00 (post init - lcr reset)
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