Bug 38490

Summary:	the xinput Coordinate Transformation Matrix is undocumented and does nothing visible
Product:	xorg	Reporter:	Michal Suchanek <hramrach>
Component:	Server/General	Assignee:	Xorg Project Team <xorg-team>
Status:	RESOLVED MOVED	QA Contact:	Xorg Project Team <xorg-team>
Severity:	normal
Priority:	medium	CC:	dapicester, peter.hutterer
Version:	7.6 (2010.12)
Hardware:	Other
OS:	All
Whiteboard:	2011BRB_Reviewed
i915 platform:		i915 features:
Bug Depends on:
Bug Blocks:	27688

Description Michal Suchanek 2011-06-20 02:42:37 UTC

xinput set-prop "Logitech USB Trackball" --type=float "Coordinate Transformation Matrix" 0 -1 0 1 0 0 0 0 1

has no effect.

This property is not driver-specific but the xinput(1) man page says nothing about it. It also does not reference any document describing the properties.

$ Xorg -version

X.Org X Server 1.10.2
Release Date: 2011-05-28
 $ xinput --version
xinput version 1.5.3
XI version on server: 2.1

Comment 1 Paolo D'Apice 2011-06-20 18:54:27 UTC

I tried also using inverting the axes with the following matrices:
a. [-1 0 0 0  1 0 0 0 1] for X axis
b. [ 1 0 0 0 -1 0 0 0 1] for Y axis
c. [-1 0 0 0 -1 0 0 0 1] for both axes
without any effect.

$ Xorg -version
  X.Org X Server 1.9.5
  Release Date: 2011-03-17
  X Protocol Version 11, Revision 0

$ xinput --version
  xinput version 1.5.3
  XI version on server: 2.0

Comment 2 Peter Hutterer 2011-06-20 19:15:29 UTC

The property currently only works for absolute devices though we're trying to fix this but possibly not until 1.11 or 1.12. It is documented here:

http://wiki.x.org/wiki/XInputCoordinateTransformationMatrixUsage

Comment 3 wjbuys 2011-12-21 07:02:04 UTC

Is progress on supporting the transformation matrix for relative devices being tracked anywhere (roadmap, bugzilla, something)?

(In reply to comment #2)
> The property currently only works for absolute devices though we're trying to
> fix this but possibly not until 1.11 or 1.12. It is documented here:
> 
> http://wiki.x.org/wiki/XInputCoordinateTransformationMatrixUsage

Comment 4 Peter Hutterer 2013-04-04 05:06:23 UTC

as of 1.14, the coordinate matrix can now be used for relative devices too

Comment 5 GitLab Migration User 2018-12-13 22:25:17 UTC

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