xinput-calibrator XChangeDeviceProperty calls ignored

Marco Cavallini koansoftware at
Wed Feb 10 08:28:57 PST 2010

Simon Thum ha scritto, Il 27/01/2010 13:29:
> Marco Cavallini wrote:
>> Simon Thum ha scritto, Il 27/01/2010 11:47:
>>> Marco Cavallini wrote:
>>>> Hi,
>>>> I'm testing and debugging xinput-calibrator and looks like
>>>> CalibratorEvdev::do_set_prop - XChangeDeviceProperty calls are ignored
>>>> by Xorg.
>>> Properties may reject attempts to change their value (to specific
>>> values). Also, if the properties don't exist before, you may be creating
>>> them but they don't have any actual meaning.
>> Simon,
>> If I see the following properties, should I be able to set an of them?
> Yeah you should. But it's important to get the value and type right.
> Citing from evdev-properties.h:
> /* Run-time calibration */
> /* CARD32, 4 values [minx, maxx, miny, maxy], or no values for unset */
> #define EVDEV_PROP_CALIBRATION "Evdev Axis Calibration"
> (you should have this file if you compiled evdev or have a *-dev package)
> You ought to be getting errors if it doesn't work:
> simon at simons ~ $ xinput --set-prop 6 "Device Accel Constant Deceleration" -1
> X Error of failed request:  BadValue (integer parameter out of range for
> operation)
>   Major opcode of failed request:  139 (XInputExtension)
>   Minor opcode of failed request:  57 ()
>   Value in failed request:  0xf3
>   Serial number of failed request:  17
>   Current serial number in output stream:  18

My calls are successfull and I get back any error.
I still have no effects on XChangeDeviceProperty calls.

Anybody could point me where to continue digging?
For instance, where is XChangeDeviceProperty?
How it manage the raw coordinates coming from /dev/input/touchscreen0 ?



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