Hi
I have used powertop
to determine what consumes most enegry and have the following results
Power est. Usage Events/s Category Description
25.7 W 100.0% Device USB device: Hydra Force Sensor (Peratech Holdco Limited)
9.62 W 100.0% Device USB device: Wireless_Device (MediaTek Inc.)
551 mW 100.0% Device Radio device: btusb
406 mW 54.1% Device Display backlight
336 mW 3.7 ms/s 747.6 Timer tick_nohz_highres_handler
173 mW 100.0% Device Radio device: ideapad_acpi
I tried to disable touchpad via keyboard (Fn+F10 in my case) and via Fedora UI Settings but the output of powertop
didn’t change.
Is there a way to enable / disable touchpad to reduce energy consumption?
I have Lenovo Legion 7 laptop.
Thank you in advance.
Since this is hardware specific question, as alternative I decided try to disable USB device when in PowerSafe mode and laptop is unplugged .
I want to change question to the following.
I have listed USB devices - lsusb
:
...
Bus 005 Device 002: ID 17ef:6131 Lenovo Hydra Force Sensor
...
grep 6131 /sys/bus/usb/devices/*/idProduct
gives me
/sys/bus/usb/devices/5-1/idProduct:6131
How can I disable it manually, and then enable it when needed? I will use bluetooth mouse when touchpad is disabled
I have found that I can use usbguard
or try overwrite the config.
What is safe way to disable/enable USB device?
I wanted to ask this question before I do something dumb 
Thank you in advance
You can blacklist USB devices by device ID, see how to disable USB devices based on vendor id in Linux environment? - Unix & Linux Stack Exchange
I imagine it is safe, but it is not convenient. Great idea for a little application or settings toggle.
I wonder if blacklisting will cut power to the device though?
I have tried running powertop
and cannot see the devices as you have shown them? My total system ‘battery discharge’ is around 3W. 25.7W seems crazy high!!
2 Likes
That is usually done in the firmware?
Or open the laptop up and unplug the ribbon cable to the touchpad
That’s sound like a bit of an overkill 
I mean if you dont need it? I use my touchpad all the time.
If my touchpad was using 25.7W I’d be disconnecting it 