Originally Posted by samuraixzodus
I tried GPT and MBR on western Digital W/GTX580 W?latest drivers. I ran xrandr -q in tty1 and it says "cannot open display". If I use another moniter in x terminal im fine.
I haven't gone all the way back through all the posts you've made about this issue, but it looks like you're trying to get your catleap to work with linux, yeah?
Is it not working AT ALL, or is it just at some tiny resolution like 800x600? I had this same problem. It stems from the Catleap using an EDID format newer than Ubuntu 12 can read. You have to manually create a new EDID file and tell your driver to use that.
Luckily for you, I come bearing links!
Link includes a downloadable EDID file as well, which I didn't have to change at all to get working.
I followed that little guide and I was blasting 1440p in glorious Linux! I hope this helps, if your problem is different, let me know. Before I found that guide I found out WAY MORE about X server than I EVER wanted to know