I have dual gtx 960s running 6 monitors, 3 each. I had to use the nouveau open source driver to put everything in 1 xscreen. If your using the nvidia propriety driver, it has an artificial limit of 3 monitors per xscreen. They do this to force power/pros to go with their quadra line which doesn't have the limit. I have run this setup successfully for 2 years, but on Fedora. I'm running F28 right now, with KDE. On 08/27/2018 09:57 AM, Andrew Lunn wrote: > On Mon, Aug 27, 2018 at 09:29:40AM -0500, o1bigtenor wrote: >> On Mon, Aug 27, 2018 at 8:44 AM, Andrew Lunn <andrew at lunn.ch> wrote: >>>> Running as previously, on Debian testing (10 or buster) with a pile of >>>> ram and and (lots of resources), with what may be more unusual is 2 >>>> graphics cards and 4 monitors set up as 2 x-screens. (Would love to >>>> condense that into 1 screen if someone has the know how and can >>>> describe it but 2 works well enough even if 1 would be quite slick >>>> (and very 'interesting').) >>> >>> Are the two cards from the same vendor? Or different vendors? >> >> Both are nvidia 570 cards from the same vendor. >>> >>> I've done this in the past using Xinerama. >> >> I am using xinerama but using 2 xscreens. Its using only 1 xscreen that >> I don't know anything about! > > You should not need to use Xinerama in order to have one Xserver merge > two screens on a single card. > > Ah, hold on. Are you using the proprietary nvidia driver? Maybe you > have to use Xinerama for that driver? > > All the open source drivers should drive two displays on one card > without any additional configuration. > > You might also find the open source driver just correctly finds two > cards, four displays, and it all just works out of the box. > > But there is a trade off. The open source drivers might just work out > of the box, the nvidia proprietary stuff will give you better > performance. If it is a gaming machine, you probably want the > performance. If its just a developers box, where you just need large > screen acreage, mostly text, the open source driver might be > sufficient. > > Andrew > _______________________________________________ > TCLUG Mailing List - Minneapolis/St. Paul, Minnesota > tclug-list at mn-linux.org > http://mailman.mn-linux.org/mailman/listinfo/tclug-list >