hal mount/unmount flash drive using dbus-send

[Григорий]

Good day,
my goal is to mount/unmount flash drive usng hal over dbus in some program, but even using "standard" dbus-send command for mounting/unmounting causing error message,

dbus-send --system --print-reply --dest=org.freedesktop.Hal /org/freedesktop/Hal/devices/volume_uuid_EAEC_055A org.freedesktop.Hal.Device.Volume.Unmount

where /org/freedesktop/Hal/devices/volume_uuid_EAEC_055A is udi of my usb flash, exactly volume not device.

error

Error org.freedesktop.DBus.Error.UnknownMethod: Method "Unmount" with signature "" on interface "org.freedesktop.Hal.Device.Volume" doesn't exist

I tried under user, under root, on debian, ubuntu.

The question is what point i've missed, or how to enable more debug output from hal or dbus?

Because according hal-spec http://people.freedesktop.org/~david/hal-spec/hal-spec.html#interface-device-volume
there are mount and unmount commands and they even throw different exceptions.

dbus-send with methods like GetProperty{String,Boolean,Integer,Double,etc} - works fine as GetAllDevices and other stuff.

hal version 0.5.11
dbus version 1.1.20
lshal output >>>
  udi = '/org/freedesktop/Hal/devices/volume_uuid_EAEC_055A'
  block.device = '/dev/sdb1'  (string)
  block.is_volume = true  (bool)
  block.major = 8  (0x8)  (int)
  block.minor = 17  (0x11)  (int)
  block.storage_device = '/org/freedesktop/Hal/devices/storage_serial_JetFlash_TS512MJF2B_61100740F336732E_0_0'  (string)
  info.capabilities = {'volume', 'block'} (string list)
  info.category = 'volume'  (string)
  info.interfaces = {'org.freedesktop.Hal.Device.Volume'} (string list)
  info.parent = '/org/freedesktop/Hal/devices/storage_serial_JetFlash_TS512MJF2B_61100740F336732E_0_0'  (string)
  info.product = 'A737-PL'  (string)
  info.udi = '/org/freedesktop/Hal/devices/volume_uuid_EAEC_055A'  (string)
  linux.hotplug_type = 3  (0x3)  (int)
  linux.sysfs_path = '/sys/block/sdb/sdb1'  (string)
  org.freedesktop.Hal.Device.Volume.method_argnames = {'mount_point fstype extra_options', 'extra_options', 'extra_options'} (string list)
  org.freedesktop.Hal.Device.Volume.method_execpaths = {'hal-storage-mount', 'hal-storage-unmount', 'hal-storage-eject'} (string list)
  org.freedesktop.Hal.Device.Volume.method_names = {'Mount', 'Unmount', 'Eject'} (string list)
  org.freedesktop.Hal.Device.Volume.method_signatures = {'ssas', 'as', 'as'} (string list)
  storage.model = ''  (string)
  volume.block_size = 512  (0x200)  (int)
  volume.fstype = 'vfat'  (string)
  volume.fsusage = 'filesystem'  (string)
  volume.fsversion = 'FAT32'  (string)
  volume.ignore = false  (bool)
  volume.is_disc = false  (bool)
  volume.is_mounted = false  (bool)
  volume.is_mounted_read_only = false  (bool)
  volume.is_partition = true  (bool)
  volume.label = 'A737-PL'  (string)
  volume.linux.is_device_mapper = false  (bool)
  volume.mount.valid_options = {'ro', 'sync', 'dirsync', 'noatime', 'nodiratime', 'noexec', 'quiet', 'remount', 'exec', 'utf8', 'shortname=', 'codepage=', 'iocharset=', 'umask=', 'dmask=', 'fmask=', 'uid=', 'flush'} (string list)
  volume.mount_point = ''  (string)
  volume.num_blocks = 1022944  (0xf9be0)  (int)
  volume.partition.flags = {'boot'} (string list)
  volume.partition.label = ''  (string)
  volume.partition.media_size = 524288000  (0x1f400000)  (uint64)
  volume.partition.number = 1  (0x1)  (int)
  volume.partition.scheme = 'mbr'  (string)
  volume.partition.start = 16384  (0x4000)  (uint64)
  volume.partition.type = '0x0b'  (string)
  volume.partition.uuid = ''  (string)
  volume.size = 523747328  (0x1f37c000)  (uint64)
  volume.unmount.valid_options = {'lazy'} (string list)
  volume.uuid = 'EAEC-055A'  (string)

-- 
thanks,
Grigory