https://bugzilla.kernel.org/show_bug.cgi?id=213771

            Bug ID: 213771
           Summary: ch341 USB-Serial converter receives but does not send
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.12-rc3
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: USB
          Assignee: drivers_usb@kernel-bugs.kernel.org
          Reporter: luzemario@gmail.com
        Regression: No

Please see Ubuntu bug
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1919051.

Tested with Alpine Linux alpine 5.10.16-0-lts kernel too.

Possibly still exists in the latest (5.14) kernel.

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