I set the monitor to switch off after 14 minutes. But what happens is that it cycles between being off a second and backlight comes on another. I am sure that this is a Linux issue for the monitor does switches off after a set time in Windows 7.
I run Debian Jessie, 3.10-3-amd64, KDE 4.10.5. I use DVI for connection. Graphic card: Nvidia GeForce 7600gs, Monitor: Lenovo Thinkvision L220x. I don't use any screensaver.
Also, despite I use DVI, KDE system settings think that I use VGA (maybe this is normal):
This is how my power settings are: