[Wayland-bugs] [Bug 90007] Cannot rotate input touchscreen with Xorg + libinput

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90007

--- Comment #5 from Peter Hutterer <peter.hutterer at who-t.net> ---
(In reply to Éric Brunet from comment #4)
> Yes logically speaking, as it is a property from the X server, it should
> maybe be in xorg.conf. On the other hand, redundancy in documentation is
> good. As a user, I have learned how to rotate in "man evdev", and in "man
> wacom", I expected to learn how to rotate in "man libinput"; I filled a bug
> when I didn't find the info!

redundancy also means that there's at least one more space where the
documentation is likely out of date :)
no problem pointing to the authoritative source from libinput, etc. but imo
there should only be one real documentation.

> By the way, out of curiosity, I looked in libinput source at the
> explanations in function evdev_device_calibrate. From what I could make out,
> the "Coordinate Transformation Matrix" and the "libinput Calibration Matrix"
> both do exactly the same thing. Shouldn't one of them be removed while
> libinput is still in development and the ABI is not completely frozen ?

not quite. The libinput matrix is relative to the device range, the X server
one is relative to the screen size. you can use the x server one to map a
device to one of two monitors, you can use the libinput one only for e.g.
turning a device upside-down. generally, the libinput matrix is supposed to
undo hw oddities, not for screen mapping (because libinput doesn't have screen
mappings).
http://wayland.freedesktop.org/libinput/doc/latest/absolute_axes.html

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