External displays not going to sleep?

Environment: Early 2013 MBP Retina 15'', OSX 10.8.5, two external HP LP2475w monitors connected via DP-DVI adaptors. The monitors are correctly recognized in the system report.
I am not running a screen saver, and in the Energy Saver preferences, I have set the display to go to sleep at 15minutes (long before the computer goes to sleep).
The built-in display indeed goes to sleep at the predetermined time, but the external monitors simply get a black screen, they don't actually go to sleep (indicator light is green, the backlight is still on). There is no problem with the monitors, they correctly go to sleep under both Windows and Linux.
My theories:
  (a) vesa information about how to turn the monitors off is incorrect
  (b) something about the mini displayport to dvi adaptor kills that signal
   (c) there is no way to turn off external monitors, I'll have to live with this
Help?
Thanks!

exactly the same here. 2011+dell 24"
i called apple hotline and they did this with me:
http://support.apple.com/kb/HT3964
and
http://support.apple.com/kb/HT1379
after this the external monitor went to sleep flawless. ... but as soon as some usb-ports are busy (with an external drive or something) - even when everything falls asleep the external monitor keeps on again.
but a least without the usb the monitor now falls asleep too - so there is hope!

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