Poor Graphics Quality Through Displayport.

[Nageri]

Hello all! First post here.

 

I recently got a BenQ XL2720z with the intent to plug it into my ASUS ROG laptop and run at 144hz. After searching everywhere for a Mini Displayport to Displayport cable, I just decided to order one off Amazon. Now before I ordered this, I purchased an adapter from Mini Displayport to Dual Link DVI. As both support 144hz, I figured I'd have no problems, but alas, still only capable of 60hz, but Dark Souls 2 looks great even at 60hz.

 

So I order this Mini to normal DP cable and plugged it in today. Switch to 144hz refresh rate, and load up Dark Souls 2. Oh boy does it look awful now. Everything is super grainy, to the point I had to check and see if some texture settings got reduced somehow (they didn't), and there is a god awful amount of screen tearing now. In fact, I wanted to make sure that switching inputs hadn't messed with some settings for some reason, and NOTHING changed between the inputs as far as settings go.

 

So I closed out, changed the refresh rate back to 60hz, and tried again. No effect, everything still sucks. Even went down to 30hz, no change, still crap. I decided on trying to at least fix the screen tearing, and check to see that my adaptive v-sync was enabled, it is. I couldn't understand it. So I switched back to the Dual Link DVI, and everything is hunky dory again, but I'm back at 60hz.

 

I have an intel core i7 processor and a GTX 860M GPU. I used Dark Souls 2 as a reference, as I run that on max settings in 1080p no problem at 60hz through DVI. And I want to reiterate that its not the refresh rate thats lowering performance or something. I am still getting the exact same graphical issues at even as low as 30hz with the DP cable. 

 

displayport.org states that there is no such thing as a high output DP cable. They seem to be saying that as long as its DP, then the quality of signal should be the same. So is Displayport just an inferior way to run a monitor, or is displayport.org full of it, and there are good and bad cables that provide differing signal qualities?

 

Thank you for any replies, if I left something out, forgive me, I'm a noobie =D. 

[Glenwing]

It's a bug with NVIDIA graphics cards, it doesn't display full RGB colors over HDMI and DisplayPort.

 

Download this utility to fix it: http://blog.metaclassofnil.com/?p=83

[Nageri]

Thank you for the reply.

 

Unfortunately this did not fix the problem. I did notice a difference in how the game looked, but it was small and did not address the overall issues. Still very grainy, like at a lower resolution but not, and screen tearing seen as a waveyness in ground textures when running forward.

[Nageri]

UPDATE:

 

I ordered a new Displayport cable (Displayport to miniDisplayport) from a different brand, and the problem still persists. Now I am trying to figure out what is causing it. I have gone back and redone all settings in Nvidia control panel as well as the game, and things still look much worse than through DVI. The cable is up to the DP 1.2 standard as well, and I've had confirmation that it works for exactly what I'm looking to do, but no one else is noticing a problem with the drop in graphics quality.

 

I have a feeling its in a display setting that's getting missed when the monitor switches from DVI to DP, but I can't find whats changing.

 

HALP