I am poking around on an older laptop that has higher than expected cpu usage while on battery.
The laptop has bluetooth turned off. Yet, I see a kernel module btusb using cpu. Any easy suggestions other than compiling a kernel? Do you think 19.10 would be any better?
If you dont need bluetooth you should be able to blacklist the kernel module
sudo nano /etc/modprobe.d/blacklist.conf
Add
blacklist btusb
At the bottom. Save
Then update the kernel
sudo update-initramfs -u
Reboot.
Hmm … followed your suggestion, running powertop, still listed under Device stats??
Try also blacklisting the bluetooth module. They both might have to be blacklisted together
Nope, that did not do it 
Interesting that it does not show up under 19.10, instead it lists Radio Device: iwlwifi as 100%