xinput-calibrator XChangeDeviceProperty calls ignored

Marco Cavallini koansoftware at
Thu Feb 11 07:20:27 PST 2010

Peter Hutterer ha scritto, Il 11/02/2010 00:18:
> On Wed, Feb 10, 2010 at 05:28:57PM +0100, Marco Cavallini wrote:
>> 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?
> xserver/Xi/xiproperty.c, ProcXChangeDeviceProperty, or if you're using
> server 1.7 xinput will likely use XIChangeProperty. that's in the same file,
> but called ProcXIChangeProperty.
> that again calls into the property handler, for acceleration properties that
> is one of the AccelSet*Property calls in xserver/dix/ptrveloc.c. 
> for evdev properties, it's EvdevSetProperty in xf86-input-evdev/src/evdev.c.
> That's likely where the Error is coming from.
> Can you provide some more detail though, it might be a trivial fix once I
> can reproduce it. What's the URL for the calibrator program and what
> property are you trying to set?
>> How it manage the raw coordinates coming from /dev/input/touchscreen0 ?
> not quite sure what you mean there.
> Cheers,
>   Peter


you was right!
The problem was caused by double "InputDevice" definition in xorg.conf
Removing the mouse device xinput calibrator work smoothly.
Thank you all.

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