I don't know how , but somehow automatic power-off of usb devices got accidentally enabled. Now my usb mouse goes off even if it's idle for 2-3 seconds. It's really irritating.
This happened after I installed powertop and powernap. Maybe it has something to do with these two applications.
How can I disable this "feature"?
It's PowerNap that's doing this.
You can disable just this part of PowerNap's power savings scripts with:
sudo powernap-action --disable usb_autosuspend
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