You should read Nathan's answer before posting what you just did which does not work on the 13" rMBP given that it does not have a dGPU.Put this command in Terminal and press the return key.
ioreg -lw0 | grep "EDID" | sed "/[^<]*</s///" | xxd -p -r | strings -6
If it says LP it's a LG panel, if it says LSN it's a Samsung panel.
*sigh* Why don't people read responses before leading other people astray? This doesn't work on 13" rMBP. Period. All you will see with this command -- if anything -- is "Color LCD"Put this command in Terminal and press the return key. [snip]
What computer do you have? This thread is specifically about the 13" Retina MacBook Pro. If you are seeing anything other than "Color LCD" you probably don't have this computer, so this is the wrong discussion thread for you. However, I will mention that I believe I have heard others seeing "LTN" on MacBook Air, and I believe that it has been demonstrated that "LTN" is another Samsung panel model # designator (they have 2 or 3 different prefixes that they use, probably depending on the panel series or the technology it employs, such as TN or IPS or whatever).What if it says LTN? Mine says LTN.
It works on my MBP 13" 2012 as well, so it doesn't depend on whether or not having a dGPU.You should read Nathan's answer before posting what you just did which does not work on the 13" rMBP given that it does not have a dGPU.
I have to assume, unless you clarify otherwise, that you have a NON-retina 13" MBP from 2012. Your experience is an interesting data point; however, I feel compelled to point out that we are talking about rMBP in this thread, which I don't think is insignificant (especially since that's what the OP was asking about, after all). Still, the 2012 13" cMBP had Intel HD 4000 graphics, same as the late-2012 13" rMBP, so you might expect results to be similar.It works on my MBP 13" 2012 as well, so it doesn't depend on whether or not having a dGPU.