When I'm connecting my iMac 27' (late 2009) via mini displayPort - mini displayPort cable to my 13' MacBook Pro everything goes as expected - iMac switches to target display mode and everything is fine.
But when I'm trying to do the same trick with 15' MacBook Pro (late 2011) thing are going wrong. I get a constantly blinking and twitching image, and it is literally painful to work (if possible at all).
I have a strong suspicion that there is something wrong with my second MacBook graphics card (which, to be precise, is
AMD Radeon HD 6750M). Had anybody encountered with same problem? And if yes, how can I resolve this?
UPD: An important subquestion - Does this actually means that using this very MacBook with thunderbolt cable will also be somewhat problematic?