Bug 90107

Summary:	Handle abs ranges of [0, 0]
Product:	Wayland	Reporter:	Peter Hutterer <peter.hutterer>
Component:	libinput	Assignee:	Wayland bug list <wayland-bugs>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	medium	CC:	peter.hutterer
Version:	unspecified
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:
Bug Depends on:	90090
Bug Blocks:

Description Peter Hutterer 2015-04-19 22:57:35 UTC

Related to Bug 90090 but let's keep that bug the device-specific one.

The kernel allows a min==max abs range provided the values are 0. This essentially means "we don't know", an example for a fix for such a device is here:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6f1891d01956cad406d2af8ed2e9cef6108bfc

libinput should deal with those devices, especially where it doesn't actually use the axis anyway. In the above case of a touchscreen - we don't use pressure so we can just ignore a bad setting.

For x/y and the MT axes we should always require a valid range.

Comment 1 Peter Hutterer 2016-01-05 05:47:15 UTC

This was mostly addressed by this commit for odd axes, for everything else we just deal with it when it comes up.

commit 776bf4938dc4f3228fbfb45a5df4d18639b146de
Author: Peter Hutterer <peter.hutterer@who-t.net>
Date:   Fri Apr 17 15:59:36 2015 +1000

    evdev: accept but disable ABS_MISC and above for min/max == 0

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