I've a 17" Touchscreen iiyama T1730S
Bus 002 Device 004: ID 0eef:0001 D-WAV Scientific Co., Ltd eGalax TouchScreen

I can not drag too.
 Xorg.0.log:
(**) Option "longtouched_button" "3"
(**) Option "LongtouchTimer" "750"


 It runs fine with:

echo "options usbtouchscreen swap_xy=1" | sudo tee /etc/modprobe.d/usbtouchscreen

sudo vi /usr/share/hal/fdi/policy/10osvendor/50-eGalax.fdi



<?xml version="1.0" encoding="UTF-8"?> <!-- -*- SGML -*- -->
<deviceinfo version="0.2">
  <device>
    <match key="info.product" contains="eGalax">
      <match key="info.capabilities" contains="input">
        <merge key="input.x11_driver" type="string">evtouch</merge>
        <merge key="input.x11_options.minx" type="string">206</merge>
        <merge key="input.x11_options.miny" type="string">221</merge>
        <merge key="input.x11_options.maxx" type="string">3858</merge>
        <merge key="input.x11_options.maxy" type="string">3851</merge>
        <merge key="input.x11_options.taptimer" type="string">30</merge>
        <merge key="input.x11_options.longtouchtimer" type="string">350</merge>
        <merge key="input.x11_options.longtouched_action" type="string">down</merge>
        <merge key="input.x11_options.longtouched_button" type="string">1</merge>
        <merge key="input.x11_options.oneandhalftap_button" type="string">2</merge>
        <merge key="input.x11_options.movelimit" type="string">15</merge>
        <merge key="input.x11_options.touched_drag" type="string">1</merge>
        <merge key="input.x11_options.maybetapped_action" type="string">click</merge>
        <merge key="input.x11_options.maybetapped_button" type="string">1</merge>
   <!--      <merge key="input.x11_options.rotate" type="string">cw</merge>  -->
   <!--     <merge key="input.x11_options.SwapAxes" type="string">1</merge> -->
        <merge key="input.x11_options.SwapY" type="string">1</merge>
        <merge key="input.x11_options.rotate" type="string">ccw</merge>
      </match>
    </match>
  </device>
</deviceinfo>


After restart the touch fails, maybe because i've a 1280x1024 screen i use at 1024x768 after reboot / switch on the pointer upper left is ok, but up to the lower right around 30% is missing (the mouse-cursor is behind my pen)

unplug the usb-touch and replug - voila (nearly) all is fine 



(-:~$ grep ouch /var/log/Xorg.0.log 
(II) config/hal: Adding input device eGalax Inc. USB TouchController
(II) LoadModule: "evtouch"
(II) Loading /usr/lib/xorg/modules/input//evtouch_drv.so
(II) Module evtouch: vendor="Kenan Esau"
(**) Option "longtouched_button" "3"
(**) Option "LongtouchTimer" "750"
(**) EVTouch TouchScreen: always reports core events
(II) XINPUT: Adding extended input device "EVTouch TouchScreen" (type: TOUCHSCREEN)
(**) EVTouch TouchScreen: (accel) keeping acceleration scheme 1
(**) EVTouch TouchScreen: (accel) filter chain progression: 2.00
(**) EVTouch TouchScreen: (accel) filter stage 0: 20.00 ms
(**) EVTouch TouchScreen: (accel) set acceleration profile 0

remove and replug touch usb-connector
(II) config/hal: removing device EVTouch TouchScreen
(II) UnloadModule: "evtouch"
(II) config/hal: Adding input device eGalax Inc. USB TouchController
(**) Option "longtouched_button" "3"
(**) Option "LongtouchTimer" "750"
(**) EVTouch TouchScreen: always reports core events
(II) XINPUT: Adding extended input device "EVTouch TouchScreen" (type: TOUCHSCREEN)
(**) EVTouch TouchScreen: (accel) keeping acceleration scheme 1
(**) EVTouch TouchScreen: (accel) filter chain progression: 2.00
(**) EVTouch TouchScreen: (accel) filter stage 0: 20.00 ms
(**) EVTouch TouchScreen: (accel) set acceleration profile 0
(-:~$