Why does daisy-chaining a Mini-DisplayPort monitor in a Thunderbolt chain cause overscan issues?

I have the awkward 2011 MacBook Pro with a single Thunderbolt port and no USB3. I very frequently use it connected to my HP 2311x LED Monitor. For the very first time, today I placed a external Thunderbolt drive in-between my MacBook Pro and the HP 2311x. This causes the image to severely overscan. Correcting it by using the underscan option in the display settings significantly reduces image quality.

Two more of interest:
http://support.apple.com/kb/PH11407
http://support.apple.com/kb/PH11409 which also says if a device works properly by itself, but then not correctly after the TB device, there may be a problem with the TB device.

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Run a mini displayport cable over a Thunderbolt port

Hi
I have a new imac with 2 thunderbolt ports - and I want to run a mini displayport cable over a thunderbolt port - is there any cable can solve this ?

http://store.apple.com/us/search?find=mini+display+port+to+hdmi+adapter
https://www.google.com/search?sugexp=chrome,mod=6&sourceid=chrome&ie=UTF-8&q=Min i+Displayport+to+HDMI+adapter
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Thunderbolt Daisy Chain to a DisplayPort Monitor (Dell 2713HM)?

I have a Mac mini (2011) that supports my Dell monitor (2713HM 27'') at its maximum reslution of 2560x1440 only through a Thunderbolt to Mini-Displayport cable. As this Mac has only Thunderbolt as a fast connection for backup drives I have to add a Thunderbolt chain with the backup device in the middle and the Dell monitor at the end of the chain if I want bakcups faster than Firewire 800 or USB 2.0 (the other possible connections with this Mac). My first attempt with such a setup was the LaCie eSATA Hub. But this does not feed the display signals through, the monitor stays black. Checked in the store with a genuin Thunderbolt monitor from Apple the daisy chain worked.
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TechnoMax wrote:
for instance STAE122 or STAE 127?
FWIW, STAE129 is the current version TB adapter
that is self powered and has TB daisy chain port.
STAE122 and STAE127 are older versions and
not the current model, though there may be stock of
these around. As to whether this will solve your issue,
I don't know.
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The MacMini HDMI port is hardware limited to 1980x1200.

Why can't the Thunderbolt port on the rear of the display support a Mini DisplayPort monitor?

I bear no ill will as I knew the situation going in and am happy with my beautiful Thunderbolt display, but I simply cannot understand this lack of a blatantly obvious feature.
Why I must unplug my Thunderbolt display from my MacBook Pro (and lose my USB keyboard, external HDD, and wired ethernet) because my Thunderbolt display - with what appears to be an identical Thunderbolt port on the rear, fully capable of powering a second Thunderbolt display - cannot power my 1080p HDTV through a Mini DisplayPort to HDMI adaptor.
I have hoped and hoped for a firmware or software update that would allow this, as it is seemingly an oversight or an anticompetitive measure, but nothing.
Any ideas, workarounds? So dumb.
EDIT: Also, this is not a realistic solution although likely would work: https://discussions.apple.com/message/17662077#17662077 - also strengthens my suspicion of this being an anticompetitive measure more than a technological lacking.

Answer?: http://www.macrumors.com/2011/09/28/apple-thunderbolt-display-teardown-reveals-p lethora-of-hardware-inside/
Still kinda uncool, and seems like a solvable technical limitation.

Comment connecter un iMac (port mini displayport) avec un écran Thunderbolt ?

Bonsoir,
Je souhaiterais connecter mon écran Thunderbolt à mon iMac. Malheureusement mon iMac n'a pas de port Thunderbolt, mais il a un port mini Displayport.
Lorsque je connecte mon écran Thunderbolt à mon iMac avec le cable Thunderbolt intégré à l'écran, rien ne s'affiche.
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Hey!
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First up, apologies if this is the wrong board but it seemed the closest fit.
I'm using MSVC 2008 Express with the NI DAQmx ANSI C library to perform some analogue output using a USB-6009. I am creating a thread to handle the generation of the signal as it is on a fixed timebase. My main thread runs the user interface. I have found that I get intermittent deadlocks in release mode while the NI libraries are being loaded (in the second thread) and I use some MSVCRT functions (on the main thread). My test code is attached as "deadlock2.cpp".
I have used WinDbg to try to find the cause of the deadlock. The stack traces of my two threads are attached as t1_stack.txt and t2_stack.txt.
It appears that the localtime() function from the MSVCRT uses a lock when it is called for the first time and then goes to lock the Windows DLL loader lock. At the same time the NI libraries (or at least mxs libraries) are being loaded so the DLL loader lock is being held. The mxsutils library uses getcwd() which appears to try to lock something in the MSVCRT and so my two threads are now deadlocked.
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Solved!
Go to Solution.
Attachments:
deadlock2.cpp ‏2 KB
t1_stack.txt ‏2 KB
t2_stack.txt ‏3 KB

Hi dmcminn,
Thank you for the detailed and complete bug report. I was able to reproduce the problem with NI-DAQmx 9.6 using the code you posted. I reported it to the appropriate R&D team as CAR #366538.
I agree with your analysis of the problem. Both getcwd() and the first call to __tzset() acquire _ENV_LOCK, which Microsoft has documented as the "lock for environment variables". __tzset() also calls GetTimeZoneInformation(), which may load additional libraries, as you have shown.
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Link to the static version of the CRT (/MT instead of /MD). This would link a separate copy of the CRT lock table into your program, and DAQmx would continue to use MSVCR90.dll's lock table. They would no longer use the same _ENV_LOCK.
Build using a different version of Microsoft Visual C++ (e.g. 2005 or 2010). MSVCR80.dll, MSVCR90.dll, and MSVCR100.dll own separate copies of the CRT lock table.
Either way, it doesn't eliminate the fact that mxsutils calls into the CRT while holding the loader lock, and that CRT function acquires another lock.
By the way, the Multifunction DAQ forum is a better place to post DAQmx questions.
Brad
Brad Keryan
NI R&D

Why does daisy-chaining a Mini-DisplayPort monitor in a Thunderbolt chain cause overscan issues?

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