On 25/10/2024 03:07, Dan Ritter wrote:
Roy J. Tellason, Sr. wrote:Oct 24 15:14:28 Workstation1 kernel: [1915052.251232] usb 7-1.4.4: ch341-uart converter now attached to ttyUSB0 Oct 24 15:14:28 Workstation1 mtp-probe: checking bus 7, device 13: "/sys/devices/pci0000:00/0000:00:1a.7/usb7/7-1/7-1.4/7-1.4.4" Oct 24 15:14:28 Workstation1 mtp-probe: bus: 7, device: 13 was not an MTP device
[...]
mtp is media transfer protocol, an alternative to USB Mass Storage. Hence thunar volume manager.
MTP likely may be ignored. There is a little chance though that its udev rule sends something to the device. When installed, this rule executed for most of (or even for all) plugged USB devices.
Perhaps vendor software sends some commands to the serial port when print is requested.