Hello, Linux newbie here.
I am trying to setup Fedora 23 64bit on my home PC, inside I have 2 Geforce 760’s. I have installed the driver 365.10 and updated all packages / kernel files on the system. Desktop environment is KDE Plasma or Cinnimon.
I was able to get the driver installed fine using an online guide to manually install it after directly downloading from Nvidia’s site. But for some reason i cant get all 4 of my monitors (2 attached to each card) to stay “on” and work at the same time. Only 3 will work, the 4th stays black. I have ruled out the monitors or cables themselves, as everything works fine with my old windows system in place. And as a test I can disable any one monitor manually and the others work fine in Linux.
Is there any limitation I should know about with this hardware or driver? Other people seem to be able to run 4 screens on just one video card.
I am very new to Linux and its command line, a step by step guide to configure this correctly would be very helpful.
I believe you can only do three monitors using mosaic mode.
This was a change made a couple of years ago.
I really hope that’s not the case. Or that there is a work around or another config mode that can be used to bridge the gap and make this work.
Well, here it is from the mouth of an nvidia developer:
We never really got an explanation from nvidia, so we just assume that MS put the screws on them.
Your other options are to run all four displays off of a single video card like you mentioned, or I think you can also run the displays off of both cards in a non-mosaic mode. (This would be like having two separate sets of displays, rather than one extended desktop.)
“This would be like having two separate sets of displays, rather than one extended desktop.”
Does that mean i wouldn’t be able to move windows between the monitors?
Also, if i cant run 2 monitors off each card as one big extended 4 screen desktop, then why would Mosaic work with 4 screens from the same card? Can anyone verify that does work?
It was the documentations example of 4 screens configured 2x2 that made me think this wouldn’t be a problem. I am disappointed that this is isn’t working as advertised.
“Does that mean i wouldn’t be able to move windows between the monitors?”
“Also, if i cant run 2 monitors off each card as one big extended 4 screen desktop, then why would Mosaic work with 4 screens from the same card?”
When you do four screens from one card, it doesn’t use Mosaic mode. It’s just one big extended desktop, using the mode that they used to call “Twinview”. They introduced four screens per card in the Kepler generation. Prior GPUs could only do two displays per card.
Can you link the documentation that showed 4 screens in 2x2 configuration? Maybe it is old, or maybe I’m wrong, or maybe it is for Quadro products only.
I cant seem to find it right now, but i do think it mentioned Quadro cards. So that must have been what i read.
It looks like this isn’t going to work, and there is no real work around, i cant even mosaic 2 of the screens and combine the last 2 to make a large 3rd. Mosaic seems to be an all or nothing setting.
If anyone knows something else i can try, please let me know. I don’t really know enough to try to manually edit the config files to accomplish more than I can with the gui settings tool.