Interfacing (DSI, CSI, I2C, etc.) • ch341 USB serial devices on raspbian failing

Hi,
I have a pi4 running 6.6.51+rpt-rpi-v8 #1 SMP PREEMPT Debian 1:6.6.51-1+rpt3 (2024-10-08) aarch64 GNU/Linux

It is connected to 4 USB/Serial devices, each of which uses the ch341 chipset

These generally work fine initially, and are detected as expected:

[ 711.443741] ch341 1-1.4:1.0: ch341-uart converter detected
[ 711.449293] usb 1-1.4: ch341-uart converter now attached to ttyUSB0

[ 716.311955] ch341 1-1.3:1.0: ch341-uart converter detected
[ 716.319447] usb 1-1.3: ch341-uart converter now attached to ttyUSB1

However at some point later, with no trigger I can yet work out, dmesg shows:

[ 742.461276] usb 1-1.4: failed to send control message: -110
[ 743.485345] usb 1-1.4: failed to send control message: -110
[ 744.509331] usb 1-1.4: failed to receive control message: -110
[ 744.509360] ch341-uart ttyUSB0: failed to read modem status: -110

Has anyone come across this issue with ch341 devices? Any ideas as to the possible cause?
I have tried using a hub as well as using a different USB port for each of the 4 devices - so far with no success

Could this be related to:

https://github.com/Koenkk/zigbee2mqtt/issues/8663

?

Statistics: Posted by dbrb2 — Thu Nov 28, 2024 11:12 am

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