Touchpad trouble with two- and three-finger touch

[Hans de Goede]

Hi,

On 04/10/2015 11:01 AM, Stefanos A. wrote:
> Hello,
>
> I am having trouble registering multi-finger touches using libinput.
> Roughly 50% of the time a touch will fail to register. Once a touch
> registers, then the next several touches also register. If it fails
> then there's again a roughly 50% chance of the next one registering.
>
> The distance or configuration of the fingers on the touchpad do not
> appear to matter.
>
> This is on Arch, using Gnome 3.16.0 and libinput 0.13.0. Hardware is a
> Samsung RC520 (15.6inch) laptop and `cat /proc/bus/input/devices`
> gives me the following touchpad:
>
> I: Bus=0011 Vendor=0002 Product=0007 Version=01b1
> N: Name="SynPS/2 Synaptics TouchPad"
> P: Phys=isa0060/serio1/input0
> S: Sysfs=/devices/platform/i8042/serio1/input/input9
> U: Uniq=
> H: Handlers=event12 mouse0
> B: PROP=9
> B: EV=b
> B: KEY=6420 30000 0 0 0 0
> B: ABS=260800011000003
>
> Any ideas on how to proceed?

Do you happen to be using a 4.0-rc kernel? There is a known synaptics
kernel driver issue in there which sounds like what you're seeing.

Regards,

Hans