[SOLVED] No LCD monitor standby when idling

[mrpi]

Software
XBian version: 1.0RC3
XBMC version: 13.2 Git:20140901-867305b
Overclock settings: Xbian profile (840Mhz)

Hardware
Power supply rating: 5V 3A
RPi model (model A/B 256mb/512mb): B+ 512mb
SD card size and make/type: Kingston 8GB microSD
Network (wireless or LAN): LAN
Connected devices (TV, USB, network storage, etc.): RPi using 3 USBs connected to: 1 Seagate USB 2.0 Expansion 2TB, 1 Samsung SATA 320GB drive in USB 3.0 enclosure, 1 Logitech USB wireless combo (kb + mouse)

Config files:
/boot/config.txt:

Quote:#initramfs initramfs.gz 0x1000000
gpu_mem_512=144
gpu_mem_256=100
initial_turbo=3
disable_overscan=1
disable_splash=1
hdmi_force_hotplug=1
hdmi_drive=2
hdmi_group=2
hdmi_mode=58
#hdmi_ignore_cec_init=1
#hdmi_pixel_encoding=2
#config_hdmi_boost=4
arm_freq=840
core_freq=320
sdram_freq=400
over_voltage=0
max_usb_current=1

Problem description:
My RPi is connected to a Samsung LCD SyncMaster 2243N VGA monitor through an HDMI-VGA adaptor.
When the black screensaver starts, the monitor doesn't go to standby and stays on, illuminating the room by showing a black image.
Is there a way to make the monitor switch to standby when idle?

Thanks in advance for any help,
Alex