On Thu, 3 Jan 2008 11:25:21 -0500
"Dmitry Torokhov" [off-list ref] wrote:

I'd rather not change the legacy mousedev driver. The extension is
rather non-standard and there is no telling what applications might
break. Please use evdev driver, it should support horizontal scrolling
AFAIK.

It does, but it doesn't support hot-plug. Not something the kernel can be blamed for, but for my use case it was easier to do this modification to the kernel rather than to teach Xorg hot-plug.

Rgds
-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  PulseAudio, core developer          http://pulseaudio.org
  rdesktop, core developer          http://www.rdesktop.org