17.04: Mouse Wheel Scroll Emulation failed after upgrade

[phillip2]

I am a long term use of a Logitech Marble Mouse. For the last few releases I have been using this code to get scroll wheel emulation:

xinput set-button-map "Logitech USB Trackball" 1 2 3 4 5 6 7 8 9
xinput set-int-prop "Logitech USB Trackball" "Evdev Wheel Emulation Button" 8 8
xinput set-int-prop "Logitech USB Trackball" "Evdev Wheel Emulation" 8 1
xinput set-int-prop "Logitech USB Trackball" "Evdev Wheel Emulation Axes" 8 6 7 4 5
xinput set-int-prop "Logitech USB Trackball" "Evdev Wheel Emulation X Axis" 8 6
xinput set-int-prop "Logitech USB Trackball" "Evdev Drag Lock Buttons" 8 9


After upgrading to 17.04 this seems to have become totally non-functional. Firefox interprets the clicks as back, everything else just ignores them. Scroll fails regardless.

Any help would be gratefully recieved.

[phillip2]

Okay, so this seems to be a problem with evdev.

https://bugs.launchpad.net/ubuntu/+s...g/+bug/1683435

Notes the same problem.

While this bug

https://bugs.launchpad.net/ubuntu/+s...193/comments/7

suggests that a related bug is caused by evdev moving to universe and libinput is being used instead.

[phillip2]

Fixed, eventually:

http://www.russet.org.uk/blog/3156

[rcastberg]

Thanks for the reply, that was very useful.
The website you linked is down, but managed to find it in : http://web.archive.org

So to summarize :
Find your mouse using :

xinput --list

And get the list of properties :

xinput --list-props ##

where ## is the number from the previous command. You need to find the line which says :
libinput Button Scrolling Button (###). where ### is a new number

You should then be able to activate scrolling using:

xinput set-prop ## ### 8

You should now have scrolling.

The auther further recommends :

xinput --set-prop --type=int --format=8 "Logitech USB Trackball" "libinput Scroll Button" 8

Where he used the name of the mouse as "logitech USB trackball", but i was never able to get this to work, even when adjusting for my mouse.

I ended up using:

xinput set-prop "PS2++ Logitech TrackMan" `xinput --list-props "PS2++ Logitech TrackMan"|grep "Button Scrolling Button"|head -n 1|awk -F '[)(]' '{print $2}'` 8

Hope this helps others.