synaptics bug 31636: non-uniform horizontal and vertical acceleration

[Chase Douglas]

On 04/02/2012 08:28 PM, Martin Spacek wrote:
> Hello,
> 
> About a year ago, Chase Douglas suggested I post about this here. I've only 
> recently become annoyed enough to finally do so.
> 
> When I add a secondary monitor horizontally to my primary one, my synaptics 
> touchpad (on a Thinkpad W510) becomes much more sensitive horizontally than 
> vertically. If I add the secondary monitor vertically, it becomes more sensitive 
> vertically than horizontally. Others have reported the same issue on different 
> machines. Here are the relevant bug reports:
> 
> https://bugs.freedesktop.org/show_bug.cgi?id=31636
> 
> https://bugs.launchpad.net/xorg-driver-synaptics/+bug/726832
> 
> Surely this can't be a design feature, can it? No other input devices (external 
> mouse or trackpoint, both via evdev apparently) behave this way, and neither 
> does the touchpad in Windows. This essentially breaks the touchpad for me on a 
> multi-monitor setup. Fortunately, when plugged into an external monitor, there's 
> usually access to an external mouse, which is perhaps why this one has flown 
> under the radar for so long. This bug has been around for coming up to a year 
> and a half. Could someone maybe have a look at it?

I have heard from a few people that they actually prefer this behavior.
I think we either need to stick with what we have or make it
configurable (and maybe change the default).

Peter, any thoughts?

-- Chase