Hello,

I have a Raspberry Pi 4 model B 8GB running 5.4.79-v7l+. I have bought it 
to replace my previous Raspberry Pi 3. The Pi 3 was connected via USB with 
an Oregon Scientific Weather Station (WMR89) and used CP210X driver to 
communicate with it. As the pair Vendor/Product ID wasn't registered in the 
driver CP210x.c, I added it using

echo 0fde ca0a > /sys/bus/usb-serial/drivers/cp210x/new_id
in boot (rc.local). With the Raspberry Pi 3 the weather station was always 
automatically recognised, drivers loaded and accesible though /dev/ttyUSB 
and weewx run without problems.

However, I am unable to get the same results with the Raspberry Pi 4. I 
have to unplug and plug manually every time the device to get it loaded. I 
have even built a new cp210x module including oregon's pair vendor/product 
ID to see if it helps but I am still stuck in the same point: I need to 
plug and unplug the USB cable from the weather station to make it work. 
Replugging the type A connector in the Raspberry Pi will make no 
difference. I have to replug the mini USB in the weather station to make it 
work (what seems really strange). 

Does anybody has an idea on how to solve this problem?

Thanks!

Daniel  

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