On Tue, Jan 05, 2021 at 04:14:14PM +0100, Augusto Ciuffoletti wrote: > I run into this problem trying to program an ESP8266 board, which uses > the CH341 chip in the programming interface as a USB-to-Serial > interface. The problem appeared after an upgrade from Ubuntu 19.10 to > 20.04 (that I carried out one week ago). > > This is the kernel I am using: > > === > $ uname -r > 5.4.0-58-generic That's an old kernel, you should get support from your distro if you want to stick with that, but: > === > > When I connect the ESP8266 board (a Wemos D1 mini) to the USB there is > no activity on the syslog (or dmesg), and the kernel module is not > loaded. In fact I do not see the /dev/ttyACM0 device in the /dev > directory and no useful device appears in the Arduino GUI. > > I have found the module in the kernel tree but, even forcing the > installation, nothing happens: > > === > augusto@Legion:~$ ls > /usr/lib/modules/5.4.0-58-generic/kernel/drivers/usb/serial/ch* > /usr/lib/modules/5.4.0-58-generic/kernel/drivers/usb/serial/ch341.ko > augusto@Legion:~$ sudo modprobe ch341 > [sudo] password di augusto: > augusto@Legion:~$ lsusb > Bus 002 Device 002: ID 05e3:0626 Genesys Logic, Inc. USB3.1 Hub > Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub > Bus 001 Device 003: ID 13d3:56a6 IMC Networks Integrated Camera > Bus 001 Device 005: ID 0cf3:e500 Qualcomm Atheros Communications > Bus 001 Device 006: ID 046d:c517 Logitech, Inc. LX710 Cordless Desktop Laser > Bus 001 Device 004: ID 093a:2510 Pixart Imaging, Inc. Optical Mouse > Bus 001 Device 002: ID 05e3:0610 Genesys Logic, Inc. 4-port hub > Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Where is your usb-to-serial device here? Are you sure it's actually working? I don't see it in the list of devices, which is a pretty good reason why the serial driver isn't working :) Try looking in the kernel log when you plug the device in, perhaps it says something? thanks, greg k-h
