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USB 2.0 ports not working on the Compute Module 4? Check your overlays!
source link: https://www.jeffgeerling.com/blog/2020/usb-20-ports-not-working-on-compute-module-4-check-your-overlays
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USB 2.0 ports not working on the Compute Module 4? Check your overlays!
November 16, 2020
Out of the box, to conserve power, the new Raspberry Pi Compute Module 4 doesn't enable its built-in USB 2.0 ports.
You might notice that if you plug something into one of the USB 2 ports on the IO Board and don't see it using lsusb -t. In fact, you see nothing, by default, if you run lsusb -t.
To enable the USB 2.0 ports on the Compute Module 4, you need to edit the boot config file (/boot/config.txt) and add:
dtoverlay=dwc2,dr_mode=host
Then reboot the Pi. Now you should be able to use the built-in USB 2.0 ports!
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