Why my touch screen can not work?

[Peter Hutterer]

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