W520 "dismounts​" monitor on DisplayPor​t when power management switches it off

My setup:
W520
Mini Dock Plus Series 3
External 1080p display on DVI
External 1440p display on DisplayPort (primary display)
The problem I'm experiencing is that the external display on the DisplayPort gets dismounted (I can hear the Windows "hardware disconnected" sound when this occurs) when the power management triggers the screens to switch off.  I can also trigger it by locking the screen (WinKey+L) and manually powering off the displays (FN+F3).
This is extremely annoying as it causes all of the Windows I have open to lose their size and position, and force into the primary display.  Windows also needs to regenerate the Aero previews (their just blank boxes until I focus the program window).
This did not occur previously when I had two external displays connected using the DVI ports.  But, I can't connect the 1440p display to DVI because DVI cannot drive a resolution that high.
For now, I've worked around it by disabling the display timeouts in power management, but I would like to have the screens switch off after a few minutes to conserve power and lifespan.
From what I can tell, this problem isn't limited to W520's and may be a larger issue with the DisplayPort standard or particular implementation.  What can I do about this?

Update your NVIDIA drivers?
Does this workaround help?
https://sites.google.com/site/ebobster/stuff/displ​ayportblanking
W520: i7-2720QM, Q2000M at 1080/688/1376, 21GB RAM, 500GB + 750GB HDD, FHD screen
X61T: L7500, 3GB RAM, 500GB HDD, XGA screen, Ultrabase
Y3P: 5Y70, 8GB RAM, 256GB SSD, QHD+ screen

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