Just tried two mice with horizontal wheel support. It's only the Logitech that's broken and seems to be a mix-up at the kernel level. evtest says this about horizontal wheel rocking:
Bluetooth Logitech M337: BTN_SIDE / BTN_EXTRA USB Microsoft Comfort Mouse 4500: REL_HWHEEL The Microsoft Mouse works fine with Mir horizontal scrolling. Maybe a Bluetooth subsystem bug? ** Summary changed: - Horizontal wheel scrolling doesn't work + Horizontal wheel scrolling doesn't work on Logitech Bluetooth M337 mouse ** Changed in: xorg-server (Ubuntu) Status: Triaged => Invalid ** Also affects: mir (Ubuntu) Importance: Undecided Status: New ** Also affects: linux (Ubuntu) Importance: Undecided Status: New ** Changed in: mir Status: New => Invalid ** Changed in: mir (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1605154 Title: Horizontal wheel scrolling doesn't work on Logitech Bluetooth M337 mouse Status in Mir: Invalid Status in linux package in Ubuntu: Incomplete Status in mir package in Ubuntu: Invalid Status in xorg-server package in Ubuntu: Invalid Bug description: Lots of mice allow you to rock the wheel left and right, and this is used for horizontal scrolling. However when used in Mir, clients see hscroll values of zero. To manage notifications about this bug go to: https://bugs.launchpad.net/mir/+bug/1605154/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp