Workaround :
Put in /etc/udev/rules.d/10-wakeup.rules
The folliwing lines
ACTION=="add", SUBSYSTEM=="usb", ATTRS{idVendor}=="046d", 
ATTRS{idProduct}=="c52b" RUN+="/bin/sh -c 'echo enabled > 
/sys/bus/usb/devices/1-1/power/wakeup'"
ACTION=="add", SUBSYSTEM=="usb", ATTRS{idVendor}=="046d", 
ATTRS{idProduct}=="c52b" RUN+="/bin/sh -c 'echo enabled > 
/sys/bus/usb/devices/1-2/power/wakeup'"
ACTION=="add", SUBSYSTEM=="usb", ATTRS{idVendor}=="046d", 
ATTRS{idProduct}=="c52b" RUN+="/bin/sh -c 'echo enabled > 
/sys/bus/usb/devices/1-3/power/wakeup'"

But this will only work for my computer and my dongle.

I guess something has changed in the kernel config or somewhere else, because
- this same workaround did not work a few days ago (cf. comment #2)
- the use of battery or AC power does not change anything (contrary to comment 
#20)

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https://bugs.launchpad.net/bugs/1873885

Title:
  USB keyboard / mouse does not wake computer from sleep

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