[yocto] X display touch calibration

[Maxin B. John]

Hi,

On Mon, Aug 29, 2016 at 05:52:31PM +0200, Gary Thomas wrote:
> On 2016-08-29 13:49, Maxin B. John wrote:
> >Hi Gary,
> >
> >On Mon, Aug 29, 2016 at 11:09:25AM +0200, Gary Thomas wrote:
> >>How is the touchscreen calibration supposed to work now (after
> >>the recent changes dropping pointercal, tslib, etc)?  I can
> >>see when I launch X that the screen calibration program runs,
> >>but I think only briefly as the main [matchbox] screen immediately
> >>comes up and without calibration, my pointer (touchscreen) is pretty
> >>useless...
> >
> >Could you share some more details about the device that you are using?
> 
> I'm using an i.MX6Q SabreLite (Boundary Devices) with a 7" LCD that has
> a TSC-2004 resistive touch screen.
> 
> >
> >Most likely, the layer which supports your device, already provides a
> >default "/etc/pointercal.xinput" file. Removing that file and restarting
> >the device should bring back the screen calibration program during boot.
> 
> I removed that file and still the same behavior.

Looks a bit strange :(

> >
> >>Ideas / pointers?
> >
> >Please update that .bbappend file or provide a "reasonable"(which works
> >with the latest xinput_calibrator) set of default values in the
> >pointercal.xinput file.
> 
> Since the autocalibrate isn't working, can you give some guidance
> what this looks like?  The one created by the [erroneous] .bbappend
> looks like this:
>   xinput set-int-prop "EETI eGalax Touch Screen" "Evdev Axis Calibration" 42060 2062 -8 -783544 1 1549 65536
>   xinput set-int-prop "EETI eGalax Touch Screen" "Evdev Axes Swap" 8 0
> 
> Note: the reason you didn't see my error when you built for imx28 was
> that this specific file is i.MX6 specific.

Oh, ok.

> Also, in the past I used a [manually crafted] file:
>     ================= /etc/X11/xorg.conf.d/11-touchscreen.conf
>     Section "InputClass"
>     Identifier "tsc2004"
>     MatchProduct "tsc2004"
>     MatchDevicePath "/dev/input/event*"
>     Driver "evdev"
>     Option "InvertX" "true"
>     Option  "Calibration"   "85 4045 166 3991"
>     EndSection
> 
> The touchscreen still works if I include this but I was trying to play
> by the new rules and use the new configuration tools, so I removed it
> and /etc/pointercal*

Good to hear that it works with the manually created file. To debug the problem
further, is it possible to share the output from the target ?
# xinput_calibrator --list

Best Regards,
Maxin