Macbook Pro and external monitor sleep issues.

I recently upgraded to a new 13 inch MacBook Pro to replace my previous one.  With the upgrade, I'm now on the latest OS and I have a Thunderbolt instead of Mini-displayport output.  I have a Dell U2410 monitor which has worked great up until now, but I now have the following behavior:
When the laptop sleeps (or puts the display to sleep) the monitor begins to turn on and off.  It goes to powersave mode and immediately wakes up, realizes there's no signal, and goes back to powersave mode, etc etc etc. 
When I wake the computer up from sleep, the monitor's behavior stays the same.  The laptop never detects the display and begins sending a signal.
If I unplug and replug the adapter, all is well.
There seem to be two separate issues: whatever signal the computer continues to send down the display cable after sleep seems to confuse my monitor, secondly, the computer never again sends a real video signal down the line after it wakes up.
I'm on the latest 10.8.3.  My adapter is the same adapter I have been using for years, an apple mini-display port to DVI adapter.  Supposedly this adapter is still compatible with the Thunderbolt port.
I've seen lots of issues online about wake up issues with the latest OS.  Is there a workaround for this yet or do I have to uplug my monitor anytime I sleep the computer?

Hi Steve,
I have had the exact same issues after adding a WD Thunderbolt Duo external drive to a Mid 2011 iMac and then daisy chaining the Dell U2410 monitor off that.
My Mini DP to DVI cable ceased working properly - sleeps issues.
After buying one of these adapters of Ebay:
http://www.ebay.com.au/itm/3-in-1-Mini-Displayport-to-HDMI-with-audio-DVI-DP-ada pter-3in1-convertor-Macbook-/110861703462?pt=US_Audio_Cables_Adapters&hash=item1 9cfdf5926
I then tried all the different cables that came originally with the Dell U2410 with that adapter, and none of then would put the U2410 to sleep properly. The backlight would stay on, or "No Displayport Cable" would float around the Dell display with the backlighting still on. Or otherwise the Dell would try to go to sleep and then wake up again and cycle like you found.
Apples Mini DP to VGA adapter was sleep successful with the VGA cable (Analogue) but the output picture was not as sharp as DVI or Displayport, plus there was RF interference with the cable.
After lots of internet searching I have found a near perfect solution:
A HDMI to DVI cable with the HDMI end connected to the Ebay 3 in 1 adapter, which then connects to the Thunderbolt port.
Connect this to DVI-D 1 on the Dell U2410.
On the Dell in Menu - Other Settings,  disable DDC/CI
Now in OSX Settings - energy Saver you will have to tick:
"Put Hard Disks to sleep where possible" and select a short time frame for "Computer Sleep"
I have found that the display would go black but the backlighting on the Dell U2410 would stay on, when the display went to sleep on the Mac as per the Energy Saver "Display Sleep" setting.
The backlighting on the Dell would only turn off when the time for 'Computer Sleep" has elapsed and the external Thunderbolt hard disk went to sleep as well.
The Dell U2410 would then wake up correctly as well when my iMac woke, with this setup.
Cheapest solution for you would be to try an Apple or Ebay HDMI to DVI adapter and then use the DVI - DVI cable that came with the Dell.
If that fails get the 3 in one Adapter and use my Mini DP/Thunderbolt to Ebay Adapter to DVI-DVI cable setup.
I'm assuming your new Macbook Pro comes with the HDMI port ?
I believe the Sleep Issues with this monitor are all related to appropriate signal on the cable, and only the HDMI to DVI solution will work correctly on Mac's connected to the Dell U2410.
Good Luck. :-)

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