![Nick [D]vB](/data/avatars/m/1132/1132239.jpg?1552018909){kind=avatar}
First off we never recommended the 980m on this thread because no one has had success with one. But since you did it I have a few questions for you. First off do you have OS X installed. Can you show me your system profiler with the internal display connected to see if the EDP header/internal display is at least recognized by the card? From here we could recommend the dying light module which bypasses the backlight control of the iMac. You can also try other 980m Bios's from techpowerup and flash within windows. But if you brick you should know what an SOIC-8 clip is and how to reflash the bios With a ch341-a or Arduino.
You beat me too it! I was in the middle of writing that to him. And it was you with the polaris card on Netkas fourms. Once the dying light module is perfected would you recommend that Polaris card? I can't remember the issues other no backlight.
Does backlight adjustment work in Linux? I was able to get backlight control on my 21.5 in windows 10. But on my 27" I never attempted windows/Linux. Still waiting to see OSX results. Make sure you're on 10.13.6 with Web drivers. I'd like to know the ROM version which is shown on the Displays tab.
Yep. Backlight control is working very well. Auto brightness works too. I can hold my hand over the light sensor by the camera and watch the display dim.
The command to use Nvidia web drivers needs to be written to NVRam. So once you boot Mac OS externally change that setting in "Nvidia Control pannel". Which Dell model did it say this card was for? Was it one of Alienware R series?
That's exactly how my 780m is in my 27" 2011, the other thunderbolt port still does data just fine. This makes me believe whatever bios this card has, is similar to the DCB tables on my 780m. Just waiting to see what happens in OS X. Even if there is no backlight, that would be a WIN because other 980m's have no internal display at all. In Linux can your card boost properly?
So based on what I just read, you have the original 13d7 which is not G-sync compatible. Maybe that's the difference VS the ROM difference. I'm not sure if NVflash will flash a 13d7 rom to 1617 (I mean anything is possible with -f usually) but not sure if the card will operate after. I'm thinking there is a hardware difference with how EDP is handled if it's a newer G-sync card.
But the display shows up in system profiler? Which is good news. You can try flashing another dell/asus/Clevo bios, as long as you know how to recover from any brick using a clip. With the 7 series we can modify boost states using Kepler bios tool. I don't know if such a thing exists for Maxwell because I believe those Bios' are signed. Kind of sucks that we have to move away from a Dell bios. How are you checking your clocks in OSX? I use heaven/valley benchmarks
Yes it's 8 year old hardware, but that really has become irrelevant as the 2600 just as fast as the i5 6600 in my 2015 iMac. As to why were doing this? We can actually run newer OS's now because the Nvidia GPU's support metal. (That's something I need to add to the list of things to add to post 1) @ibanezbass was getting irritated because of lack of backlight not working. Please read the last few posts before posting.
