Back/Forward Mouse Buttons Don't Show up in Evtest

Question

My Mi Silent Mouse does not produce events when pressing the back/forward buttons. The mouse is connected via Bluetooth on Ubuntu 20.04.1.

photo of side buttons

$ xinput query-state "Mi Silent Mouse" produces

2 classes :
ButtonClass
    button[1]=up
    button[2]=up
    button[3]=up
    button[4]=up
    button[5]=up
    button[6]=up
    button[7]=up
ValuatorClass Mode=Relative Proximity=In
    valuator[0]=1973
    valuator[1]=741
    valuator[2]=0
    valuator[3]=11640

Buttons 1-5 are the three main buttons plus wheel up/down, so buttons 6-7 should be the back/forward buttons.

evtest doesn't show any events when pressing these two buttons though.

On the other hand, the mouse works perfectly on Windows on a secondary partition on the same machine.

I have not found much info on how to solve this problem, any help appreciated.

Answer 1

The mouse sends a bad HID report descriptor on Bluetooth (it sends the right one over USB). I wrote a kernel module to fix it:

Installation instructions:

sudo apt install git build-essential dkms
git clone 
cd hid_mimouse
make

If make runs without errors you can

sudo make install
sudo dkms add .
sudo dkms install hid_mimouse/1.0

And reboot.

Back/Forward Mouse Buttons Don't Show up in Evtest

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