Public bug reported: 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 === 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 augusto@Legion:~$ lsmod | grep ch34 ch341 20480 0 usbserial 53248 1 ch341 === Without this module it is impossible to work with a relevant number of SBC devices, besides the named Wemos D1 Mini. Trying to solve the problem I also downloaded and installed the module source from https://github.com/juliagoda/CH341SER and compiled on my PC, after removing the "secure boot" feature. I recovered the module installation trace from the syslog files in the previous installation Ubuntu 19.10. The kernel version was probably 5.3.0-64-generic. As said above, at that time the module was operating properly: you notice that the module is loaded and later used to update a sketch: ====== Dec 30 12:22:43 Legion kernel: [2354065.515635] usb 1-3: new full-speed USB device number 30 using xhci_hcd Dec 30 12:22:43 Legion kernel: [2354065.664692] usb 1-3: New USB device found, idVendor=1a86, idProduct=7523, bcdDevice= 2.64 Dec 30 12:22:43 Legion kernel: [2354065.664697] usb 1-3: New USB device strings: Mfr=0, Product=2, SerialNumber=0 Dec 30 12:22:43 Legion kernel: [2354065.664701] usb 1-3: Product: USB Serial Dec 30 12:22:43 Legion kernel: [2354065.666768] ch341 1-3:1.0: ch341-uart converter detected Dec 30 12:22:43 Legion kernel: [2354065.667695] usb 1-3: ch341-uart converter now attached to ttyUSB1 Dec 30 12:22:43 Legion mtp-probe: checking bus 1, device 30: "/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3" Dec 30 12:22:43 Legion mtp-probe: bus: 1, device: 30 was not an MTP device Dec 30 12:22:43 Legion snapd[15280]: hotplug.go:199: hotplug device add event ignored, enable experimental.hotplug Dec 30 12:22:43 Legion mtp-probe: checking bus 1, device 30: "/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3" Dec 30 12:22:43 Legion mtp-probe: bus: 1, device: 30 was not an MTP device Dec 30 12:22:45 Legion ModemManager[1198]: <info> Couldn't check support for device '/sys/devices/pci0000:00/0000:00:14.0/usb1/1-3': not supported by any plugin Dec 30 12:22:46 Legion systemd[6301]: tracker-extract.service: Succeeded. Dec 30 12:22:46 Legion dbus-daemon[1183]: [system] Activating via systemd: service name='net.reactivated.Fprint' unit='fprintd.service' requested by ':1.52054' (uid=1000 pid=18287 comm="/usr/bin/gnome-shell " label="unconfined") Dec 30 12:22:46 Legion systemd[1]: Starting Fingerprint Authentication Daemon... Dec 30 12:22:46 Legion dbus-daemon[1183]: [system] Successfully activated service 'net.reactivated.Fprint' Dec 30 12:22:46 Legion systemd[1]: Started Fingerprint Authentication Daemon. Dec 30 12:22:50 Legion NetworkManager[1193]: <info> [1609327370.5477] agent-manager: req[0x5574cc0e7540, :1.52054/org.gnome.Shell.NetworkAgent/1000]: agent registered Dec 30 12:22:50 Legion gnome-shell[18287]: [AppIndicatorSupport-DEBUG] Registering StatusNotifierItem :1.87/org/ayatana/NotificationItem/software_update_available Dec 30 12:22:50 Legion gnome-shell[18287]: [AppIndicatorSupport-DEBUG] Registering StatusNotifierItem :1.82/org/ayatana/NotificationItem/dropbox_client_18678 Dec 30 12:22:50 Legion gnome-shell[18287]: [AppIndicatorSupport-DEBUG] Registering StatusNotifierItem :1.110/org/ayatana/NotificationItem/whatsdesk1 Dec 30 12:22:50 Legion gnome-shell[18287]: [AppIndicatorSupport-FATAL] unable to update overlay icon Dec 30 12:22:50 Legion gnome-shell[18287]: message repeated 5 times: [ [AppIndicatorSupport-FATAL] unable to update overlay icon] Dec 30 12:22:50 Legion gnome-shell[18287]: Couldn’t parse user-home.desktop as a desktop file, will treat it as a regular file. Dec 30 12:22:50 Legion gnome-shell[18287]: Couldn’t parse trash-can.desktop as a desktop file, will treat it as a regular file. Dec 30 12:22:50 Legion gnome-shell[18287]: Couldn’t parse network.desktop as a desktop file, will treat it as a regular file. Dec 30 12:22:50 Legion gnome-shell[18287]: Couldn’t parse computer.desktop as a desktop file, will treat it as a regular file. Dec 30 12:22:50 Legion gnome-shell[18287]: [AppIndicatorSupport-WARN] Attempting to re-register :1.82/org/ayatana/NotificationItem/dropbox_client_18678; resetting instead Dec 30 12:22:50 Legion gnome-shell[18287]: [AppIndicatorSupport-WARN] Item :1.82/org/ayatana/NotificationItem/dropbox_client_18678 is already registered Dec 30 12:22:51 Legion gnome-shell[18287]: Window manager warning: Overwriting existing binding of keysym 31 with keysym 31 (keycode a). Dec 30 12:22:51 Legion gnome-shell[18287]: Window manager warning: Overwriting existing binding of keysym 32 with keysym 32 (keycode b). Dec 30 12:22:51 Legion gnome-shell[18287]: Window manager warning: Overwriting existing binding of keysym 33 with keysym 33 (keycode c). Dec 30 12:22:51 Legion gnome-shell[18287]: Window manager warning: Overwriting existing binding of keysym 38 with keysym 38 (keycode 11). Dec 30 12:22:51 Legion gnome-shell[18287]: Window manager warning: Overwriting existing binding of keysym 39 with keysym 39 (keycode 12). Dec 30 12:22:51 Legion gnome-shell[18287]: Window manager warning: Overwriting existing binding of keysym 34 with keysym 34 (keycode d). Dec 30 12:22:51 Legion gnome-shell[18287]: Window manager warning: Overwriting existing binding of keysym 35 with keysym 35 (keycode e). Dec 30 12:22:51 Legion gnome-shell[18287]: Window manager warning: Overwriting existing binding of keysym 36 with keysym 36 (keycode f). Dec 30 12:22:51 Legion gnome-shell[18287]: Window manager warning: Overwriting existing binding of keysym 37 with keysym 37 (keycode 10). Dec 30 12:23:06 Legion tracker-store[17432]: OK Dec 30 12:23:06 Legion systemd[6301]: tracker-store.service: Succeeded. Dec 30 12:23:17 Legion systemd[1]: fprintd.service: Succeeded. Dec 30 12:23:35 Legion dbus-daemon[18113]: [session uid=1000 pid=18113] Activating via systemd: service name='org.freedesktop.Tracker1' unit='tracker-store.service' requested by ':1.74' (uid=1000 pid=18568 comm="/usr/lib/tracker/tracker-miner-fs " label="unconfined") Dec 30 12:23:35 Legion systemd[6301]: Starting Tracker metadata database store and lookup manager... Dec 30 12:23:35 Legion dbus-daemon[18113]: [session uid=1000 pid=18113] Successfully activated service 'org.freedesktop.Tracker1' Dec 30 12:23:35 Legion systemd[6301]: Started Tracker metadata database store and lookup manager. Dec 30 12:23:35 Legion dbus-daemon[18113]: [session uid=1000 pid=18113] Activating via systemd: service name='org.freedesktop.Tracker1.Miner.Extract' unit='tracker-extract.service' requested by ':1.74' (uid=1000 pid=18568 comm="/usr/lib/tracker/tracker-miner-fs " label="unconfined") Dec 30 12:23:35 Legion systemd[6301]: Starting Tracker metadata extractor... Dec 30 12:23:35 Legion dbus-daemon[18113]: [session uid=1000 pid=18113] Successfully activated service 'org.freedesktop.Tracker1.Miner.Extract' Dec 30 12:23:35 Legion systemd[6301]: Started Tracker metadata extractor. Dec 30 12:23:46 Legion systemd[6301]: tracker-extract.service: Succeeded. Dec 30 12:24:06 Legion tracker-store[17590]: OK Dec 30 12:24:06 Legion systemd[6301]: tracker-store.service: Succeeded. Dec 30 12:24:35 Legion dbus-daemon[18113]: [session uid=1000 pid=18113] Activating via systemd: service name='org.freedesktop.Tracker1' unit='tracker-store.service' requested by ':1.74' (uid=1000 pid=18568 comm="/usr/lib/tracker/tracker-miner-fs " label="unconfined") Dec 30 12:24:35 Legion systemd[6301]: Starting Tracker metadata database store and lookup manager... Dec 30 12:24:35 Legion dbus-daemon[18113]: [session uid=1000 pid=18113] Successfully activated service 'org.freedesktop.Tracker1' Dec 30 12:24:35 Legion systemd[6301]: Started Tracker metadata database store and lookup manager. Dec 30 12:24:35 Legion dbus-daemon[18113]: [session uid=1000 pid=18113] Activating via systemd: service name='org.freedesktop.Tracker1.Miner.Extract' unit='tracker-extract.service' requested by ':1.74' (uid=1000 pid=18568 comm="/usr/lib/tracker/tracker-miner-fs " label="unconfined") Dec 30 12:24:35 Legion systemd[6301]: Starting Tracker metadata extractor... Dec 30 12:24:35 Legion dbus-daemon[18113]: [session uid=1000 pid=18113] Successfully activated service 'org.freedesktop.Tracker1.Miner.Extract' Dec 30 12:24:35 Legion systemd[6301]: Started Tracker metadata extractor. Dec 30 12:24:46 Legion systemd[6301]: tracker-extract.service: Succeeded. Dec 30 12:25:06 Legion tracker-store[17687]: OK Dec 30 12:25:06 Legion systemd[6301]: tracker-store.service: Succeeded. Dec 30 12:25:13 Legion gnome-shell[18287]: Opzioni di compilazione cambiate, ricompilo tutto Dec 30 12:25:14 Legion gnome-shell[18287]: Lo sketch usa 263420 byte (25%) dello spazio disponibile per i programmi. Il massimo è 1044464 byte. Dec 30 12:25:14 Legion gnome-shell[18287]: Le variabili globali usano 26904 byte (32%) di memoria dinamica, lasciando altri 55016 byte liberi per le variabili locali. Il massimo è 81920 byte. Dec 30 12:25:14 Legion gnome-shell[18287]: esptool.py v2.6 Dec 30 12:25:14 Legion gnome-shell[18287]: Traceback (most recent call last): Dec 30 12:25:14 Legion gnome-shell[18287]: File "/home/augusto/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/tools/upload.py", line 25, in <module> Dec 30 12:25:14 Legion gnome-shell[18287]: esptool.main(fakeargs) Dec 30 12:25:14 Legion gnome-shell[18287]: 2.6 Dec 30 12:25:14 Legion gnome-shell[18287]: esptool.py v2.6 Dec 30 12:25:14 Legion gnome-shell[18287]: File "/home/augusto/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/tools/esptool/esptool.py", line 2652, in main Dec 30 12:25:14 Legion gnome-shell[18287]: Serial port /dev/ttyUSB0 Dec 30 12:25:14 Legion gnome-shell[18287]: esp = chip_class(each_port, initial_baud, args.trace) Dec 30 12:25:14 Legion gnome-shell[18287]: File "/home/augusto/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/tools/esptool/esptool.py", line 222, in __init__ Dec 30 12:25:14 Legion gnome-shell[18287]: self._port = serial.serial_for_url(port) Dec 30 12:25:14 Legion gnome-shell[18287]: File "/home/augusto/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/tools/pyserial/serial/__init__.py", line 88, in serial_for_url Dec 30 12:25:14 Legion gnome-shell[18287]: instance.open() Dec 30 12:25:14 Legion gnome-shell[18287]: File "/home/augusto/.arduino15/packages/esp8266/hardware/esp8266/2.5.2/tools/pyserial/serial/serialposix.py", line 268, in open Dec 30 12:25:14 Legion gnome-shell[18287]: raise SerialException(msg.errno, "could not open port {}: {}".format(self._port, msg)) Dec 30 12:25:14 Legion gnome-shell[18287]: serial.serialutil.SerialException: [Errno 2] could not open port /dev/ttyUSB0: [Errno 2] No such file or directory: '/dev/ttyUSB0' Dec 30 12:25:14 Legion gnome-shell[18287]: Errore durante il caricamento dello sketch Dec 30 12:25:24 Legion gnome-shell[18287]: Lo sketch usa 263420 byte (25%) dello spazio disponibile per i programmi. Il massimo è 1044464 byte. Dec 30 12:25:24 Legion gnome-shell[18287]: Le variabili globali usano 26904 byte (32%) di memoria dinamica, lasciando altri 55016 byte liberi per le variabili locali. Il massimo è 81920 byte. Dec 30 12:25:24 Legion gnome-shell[18287]: esptool.py v2.6 Dec 30 12:25:24 Legion gnome-shell[18287]: 2.6 Dec 30 12:25:24 Legion gnome-shell[18287]: esptool.py v2.6 Dec 30 12:25:24 Legion gnome-shell[18287]: Serial port /dev/ttyUSB1 Dec 30 12:25:35 Legion dbus-daemon[18113]: [session uid=1000 pid=18113] Activating via systemd: service name='org.freedesktop.Tracker1' unit='tracker-store.service' requested by ':1.74' (uid=1000 pid=18568 comm="/usr/lib/tracker/tracker-miner-fs " label="unconfined") Dec 30 12:25:35 Legion systemd[6301]: Starting Tracker metadata database store and lookup manager... Dec 30 12:25:35 Legion dbus-daemon[18113]: [session uid=1000 pid=18113] Successfully activated service 'org.freedesktop.Tracker1' Dec 30 12:25:35 Legion systemd[6301]: Started Tracker metadata database store and lookup manager. Dec 30 12:25:35 Legion dbus-daemon[18113]: [session uid=1000 pid=18113] Activating via systemd: service name='org.freedesktop.Tracker1.Miner.Extract' unit='tracker-extract.service' requested by ':1.74' (uid=1000 pid=18568 comm="/usr/lib/tracker/tracker-miner-fs " label="unconfined") Dec 30 12:25:35 Legion systemd[6301]: Starting Tracker metadata extractor... Dec 30 12:25:35 Legion dbus-daemon[18113]: [session uid=1000 pid=18113] Successfully activated service 'org.freedesktop.Tracker1.Miner.Extract' Dec 30 12:25:35 Legion systemd[6301]: Started Tracker metadata extractor. Dec 30 12:25:38 Legion gnome-shell[18287]: Connecting........_____....._____....._____....._ Dec 30 12:25:38 Legion gnome-shell[18287]: Chip is ESP8266EX Dec 30 12:25:38 Legion gnome-shell[18287]: Features: WiFi Dec 30 12:25:38 Legion gnome-shell[18287]: MAC: 8c:ce:4e:e1:dc:be Dec 30 12:25:38 Legion gnome-shell[18287]: Uploading stub... Dec 30 12:25:38 Legion gnome-shell[18287]: Running stub... Dec 30 12:25:38 Legion gnome-shell[18287]: Stub running... Dec 30 12:25:38 Legion gnome-shell[18287]: Changing baud rate to 460800 Dec 30 12:25:38 Legion gnome-shell[18287]: Changed. Dec 30 12:25:38 Legion gnome-shell[18287]: Configuring flash size... Dec 30 12:25:38 Legion gnome-shell[18287]: Auto-detected Flash size: 4MB Dec 30 12:25:38 Legion gnome-shell[18287]: Compressed 267568 bytes to 195058... Dec 30 12:25:43 Legion gnome-shell[18287]: #015Writing at 0x00000000... (8 %)#015Writing at 0x00004000... (16 %)#015Writing at 0x00008000... (25 %)#015Writing at 0x0000c000... (33 %)#015Writing at 0x00010000... (41 %)#015Writing at 0x00014000... (50 %)#015Writing at 0x00018000... (58 %)#015Writing at 0x0001c000... (66 %)#015Writing at 0x00020000... (75 %)#015Writing at 0x00024000... (83 %)#015Writing at 0x00028000... (91 %)#015Writing at 0x0002c000... (100 %)#015Wrote 267568 bytes (195058 compressed) at 0x00000000 in 4.4 seconds (effective 483.5 kbit/s)... Dec 30 12:25:43 Legion gnome-shell[18287]: Hash of data verified. Dec 30 12:25:43 Legion gnome-shell[18287]: Leaving... Dec 30 12:25:43 Legion gnome-shell[18287]: Hard resetting via RTS pin... Dec 30 12:25:46 Legion systemd[6301]: tracker-extract.service: Succeeded. Dec 30 12:26:06 Legion tracker-store[17872]: OK Dec 30 12:26:06 Legion systemd[6301]: tracker-store.service: Succeeded. ======== This is an integral dump, so you find some lines that are clearly not related to the CH341. I have several traces of this kind. Thank you for any help Note: I originally posted this question on AskUbuntu (https://askubuntu.com/questions/1304116/problem-with-the-ch341-driver-in-ubuntu-20-04), but with no answer after 40+ views (now 56). I bounced to the linux-...@vger.kernel.org maillist which suggested submitting the problem to the Ubuntu kernel team, where I found casca...@canonical.com that suggested me to submit this as a bug. Here I am... ** Affects: ubuntu Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1910566 Title: Problem with the CH341 driver in Ubuntu 20.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1910566/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
