"Don't know how to use device"

Søren Hauberg hauberg at gmail.com
Fri Sep 26 02:30:55 PDT 2008

Hi All,
  In an effort to be able to hack on the latest evdev driver I thought
I'd update to the latest Ubuntu beta, to get a system that supports
the latest X. I have the problem that my touchscreen is not recognized
by X at startup. In /var/log/Xorg.0.log I see the following

(II) Loading /usr/lib/xorg/modules/input//evdev_drv.so
(II) Module evdev: vendor="X.Org Foundation"
        compiled for 1.5.0, module version = 2.0.99
        Module class: X.Org XInput Driver
        ABI class: X.Org XInput driver, version 2.1
(**) TSC-10 DM TSC-10 DM: always reports core events
(**) TSC-10 DM TSC-10 DM: Device: "/dev/input/event6"
(II) TSC-10 DM TSC-10 DM: Found x and y absolute axes
(II) TSC-10 DM TSC-10 DM: Found absolute touchpad
(WW) TSC-10 DM TSC-10 DM: Don't know how to use device
(II) UnloadModule: "evdev"
(EE) PreInit returned NULL for "TSC-10 DM TSC-10 DM"
(EE) config/hal: NewInputDeviceRequest failed

This hotplug stuff is quite new to me, so I don't really know how to
debug this. Any thoughts? I can mention that 'hal-device' contains the

31: udi = '/org/freedesktop/Hal/devices/usb_device_afa_3e8_noserial_if0_logicald
  input.product = 'TSC-10 DM TSC-10 DM'  (string)
  button.has_state = false  (bool)
  linux.device_file = '/dev/input/event6'  (string)
  input.x11_driver = 'evdev'  (string)
  linux.sysfs_path = '/sys/class/input/input6/event6'  (string)
  input.originating_device =
  info.subsystem = 'input'  (string)
  info.parent =
  info.product = 'TSC-10 DM TSC-10 DM'  (string)
  info.addons.singleton = { 'hald-addon-input' } (string list)
  info.udi = '/org/freedesktop/Hal/devices/usb_device_afa_3e8_noserial_if0_logicaldev_input'
  info.category = 'input'  (string)
  linux.hotplug_type = 2  (0x2)  (int)
  linux.subsystem = 'input'  (string)
  info.capabilities = { 'input', 'button', 'input.mouse' } (string list)
  input.device = '/dev/input/event6'  (string)


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