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Linux: How to wake up from stand-by on USB input

Use the lsusb command to figure out the vendor and product ID of the USB device you are interested in:

lsusb

This will print out something like:

Bus 001 Device 009: ID 045e:07b2 Microsoft Corp.
Bus 001 Device 010: ID 046d:c52b Logitech, Inc. Unifying Receiver

The vendor and product IDs are the two hexadecimal values separated by a colon - like 046d:c52b.

In my case, I’m interested in the Logitech keyboard, for which the vendor ID would be 046d and the product ID would be c52b.

The next step is to find the directory under /sys/bus/usb/devices that matches the product. Have a look inside this directory:

ls /sys/bus/usb/devices

You will find a list of devices that don’t seem to be correlated with the lsusb output. The correlation is established by the contents of the idVendor and idProduct files inside these subdirectories. You can use tail with a wildcard to output the contents of these files, including their exact path, and identify the subdirectory of interest:

# Replace 046d with your vendor ID
tail /sys/bus/usb/devices/*/idVendor | grep -B1 046d

# Replace c52b with your product ID
tail /sys/bus/usb/devices/*/idProduct | grep -B1 c52b

Look for the subdirectory name where both the vendor and the product ID match. In my case, it was /sys/bus/usb/devices/1-2.1.

The final step is to enable waking up from stand-by:

# Replace 1-2.1 with the subdirectory name matching your product
echo "enabled" > /sys/bus/usb/devices/1-2.1/power/wakeup

In case you ever want to disable waking up from stand-by, replace enabled with disabled:

# Replace 1-2.1 with the subdirectory name matching your product
echo "disabled" > /sys/bus/usb/devices/1-2.1/power/wakeup