Comment 9 for bug 1801642

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Daniel van Vugt (vanvugt) wrote : Re: Bluetooth mouse sleeps after 5 seconds of inactivity

First ensure you don't have 'tlp' installed.

Second, I can only answer by Googling. Maybe changing your kernel command line to disable autosuspend of USB devices:

https://www.kernel.org/doc/html/v4.16/driver-api/usb/power-management.html