Sorry, but it was a false alert. Both cables I used were not working
properly, one (the one used just after the upgrade) working intermittently.
When I used a third cable and a new Wemos (paranoid you say) for preparing
for apport, the module was loaded and all worked fine.

Thank you so much for your time.

Augusto

Il giorno ven 8 gen 2021 alle ore 17:30 Brian Murray <
<email address hidden>> ha scritto:

> ** Project changed: kernel => linux (Ubuntu)
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1910566
>
> Title:
>   Problem with the CH341 driver in Ubuntu 20.04
>
> Status in linux package in Ubuntu:
>   New
>
> Bug description:
>   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
>   <email address hidden> maillist which suggested submitting the
>   problem to the Ubuntu kernel team, where I found <email address hidden>
> that suggested me to submit this as a bug. Here I am...
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1910566/+subscriptions
>


-- 
Augusto Ciuffoletti
Via Milano 118
38122 - Trento