Daisy-Chaining a DVI Monitor on a Thunderbolt Display?
I would just like to chime in here and note that it is possible to get that DVI display to daisy-chain, but the caveat is that you have to put another Thunderbolt device in between the Thunderbolt display and the Mini DisplayPort->DVI converter.


  Apple's notes one other caveat about the Thunderbolt display: older
  Mini DisplayPort displays won't light up if they're hooked directly
  into the Thunderbolt port on the newer LCD. Macworld's testing found
  that Mini DisplayPort LCDs can be added to a Thunderbolt chain and
  work as normal by hooking them into another Thunderbolt peripheral.


See: http://www.tuaw.com/2011/09/18/thunderbolt-display-daisy-chaining-spec-cleared-up/