Bug 95479

Summary:	Unable to enable multiple touchpad scrolling methods simultaneously
Product:	Wayland	Reporter:	exc <exclusive_tm>
Component:	libinput	Assignee:	Wayland bug list <wayland-bugs>
Status:	RESOLVED WONTFIX	QA Contact:
Severity:	normal
Priority:	medium	CC:	peter.hutterer
Version:	1.2.x
Hardware:	All
OS:	Linux (All)
See Also:	https://bugs.freedesktop.org/show_bug.cgi?id=90070
Whiteboard:
i915 platform:		i915 features:

Description exc 2016-05-19 02:03:57 UTC

Hi,

With xf86-input-synaptics I used to have both edge and two-finger scrolling
methods enabled at same time, but with xf86-input-libinput I can't.

Steps to Reproduce:
    xinput set-prop 'SynPS/2 Synaptics TouchPad' 'libinput Scroll Method Enabled' 1 1 0

Actual Results:
    X Error of failed request:  BadValue (integer parameter out of range for operation)
      Major opcode of failed request:  131 (XInputExtension)
      Minor opcode of failed request:  57 ()
      Value in failed request:  0x121
      Serial number of failed request:  20
      Current serial number in output stream:  21 

Expected Results:
    Ability to use two-finger and edge scrolling at same time.

According to bug 90070, this behaviour used to be enabled accidentally.

I'm using Debian Stretch amd64, libinput10 1.2.4-1, xserver-xorg-input-libinput 0.18.0-1.

Comment 1 Peter Hutterer 2016-05-19 02:15:06 UTC

Yeah, that's a design decision, we won't allow that, sorry.

Comment 2 exc 2016-05-19 02:48:10 UTC

So, changing second parameter type of libinput_device_config_scroll_set_method to bitmask is out of question? It even won't break ABI: looks like values of enum libinput_config_scroll_method was selected for this purpose.

Sorry if I missed something.

Comment 3 Peter Hutterer 2016-05-19 03:12:30 UTC

The API is the easy bit, the more difficult bit is making sure the implementation works as expected. And simply said it's too niche a use-case to spend a large amount of time on it.

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