Why my touch screen can not work?

[Peter Hutterer]

On Thu, Nov 18, 2010 at 09:28:47AM +0800, Leo wrote:
> Dear Peter:
>     I attach my evtest&&xev log.  it seems to work ok.
> But there's something intersting, I just repeat operation on the different
> place of touch screen.
> Evtest can distinguish the position, you can have a look at the log, the ABS
> coordinate keep changing,
> While XEV I run on my device, this test seems not as what we want,  it can
> distinguish the BTN_PRESS && BTN_RELEASE or
> motion, but the position never changed.

what version of evdev are you running? have you tried git master and/or an
older version of evdev? If it works, can you bisect to it, I don't see
anything in the evtest stream that should make this device not work.

>    I guess there's some place to transform the event as user want in Xorg.
> evtest may read from the /dev/input/event3 directly, it's ok. But XEV Which
> may depends on X11's transformation, so appears the different situation.
> 
>     Please give some hints, thanks [?]
> 
> BTW: I can not open the LINK [?]
> http://who-t.blogspot.com/2010/11/how-to-ignore-configuration-errors.html
> Is there any other website ?

no, I just wrote this up today and it seems to work here.

Cheers,
  Peter

> 2010/11/18 Peter Hutterer <peter.hutterer at who-t.net>
> 
> > On Wed, Nov 17, 2010 at 09:34:49AM +0800, Leo wrote:
> > > I prepare to port Meego(Linux based) to my devkit8000, follow the porting
> > > guide
> > > http://wiki.meego.com/ARM/Meego_on_B...d_from_scratch<
> > http://wiki.meego.com/ARM/Meego_on_Beagleboard_from_scratch>
> > > everything seems ok: show the home screen, launch the application,
> > > But there's problem about touch screen. Meego can not recognize my
> > behavior.
> > > I'm not sure it's related with Xorg or driver. Here is my Xorg log:
> > >
> > > 59.837] (II) config/udev: Adding input device ADS7846 Touchscreen
> > (/dev/i)
> > > [ 59.837] (**) ADS7846 Touchscreen: Applying InputClass "default"
> > > [ 59.841] (**) ADS7846 Touchscreen: Applying InputClass "evdev
> > touchscreen "
> > > [ 59.842] (**) ADS7846 Touchscreen: always reports core events
> > > [ 59.842] (**) ADS7846 Touchscreen: Device: "/dev/input/event3"
> > > [ 59.842] (--) ADS7846 Touchscreen: Found absolute axes
> > > [ 59.842] (--) ADS7846 Touchscreen: Found x and y absolute axes
> > > [ 59.842] (--) ADS7846 Touchscreen: Found absolute touchscreen
> > > [ 59.843] (II) ADS7846 Touchscreen: Configuring as touchscreen
> > > [ 59.843] (**) ADS7846 Touchscreen: YAxisMapping: buttons 4 and 5
> > > [ 59.843] (**) ADS7846 Touchscreen: EmulateWheelButton: 4,
> > EmulateWheelIner0
> > > [ 59.845] (II) XINPUT: Adding extended input device "ADS7846 Touchscreen"
> > ()
> > > [ 59.851] (II) ADS7846 Touchscreen: initialized for absolute axes.
> > > [ 59.854] (II) config/udev: Adding input device ADS7846 Touchscreen
> > (/dev/i)
> > > [ 59.854] (**) ADS7846 Touchscreen: Applying InputClass "default"
> > > [ 59.855] (**) ADS7846 Touchscreen: always reports core events
> > > [ 59.855] (**) ADS7846 Touchscreen: Device: "/dev/input/mouse0"
> > > [ 59.855] (EE) ioctl EVIOCGNAME failed: Inappropriate ioctl for device
> > > [ 59.856] (II) UnloadModule: "evdev"
> > > [ 59.856] (EE) PreInit returned NULL for "ADS7846 Touchscreen"
> > > [ 60.102] (NI) OMAPFBSaveScreen: Dim backlight?
> > >
> > > who has the experience about these kind of problem, pls talk to me!
> > > thanks very much
> >
> > does it work at all? do you see events come out of the device when you run
> > evtest against it?
> >
> > as for the error message:
> > http://who-t.blogspot.com/2010/11/how-to-ignore-configuration-errors.html
> >
> > Cheers,
> >   Peter
> >