On Tue, Jun 16, 2015 at 3:53 PM, Stephen Adler <[email protected]> wrote: > On Tue, 2015-06-16 at 15:47 -0400, Ilia Mirkin wrote: >> On Tue, Jun 16, 2015 at 3:33 PM, Stephen Adler < >> [email protected]> wrote: >> > Guys, >> > >> > Is there support for display port 1.2 with the nouveau driver and >> > GTX >> > 970? >> > >> > I have a dell 4K monitor and to run it in 4K mode at 60Hz I need to >> > configure the monitor to run version 1.2 of the display port >> > protocol. >> > the nouveau driver works well with display port 1.1 but I only get >> > a >> > 30Hz refresh rate at 4K resolution. >> >> The DP 1.2 540MHz rate should be supported. However there is >> presently >> no MST support, so if the monitor has 2 internal panels, that won't >> pan out so well (yet). >> >> Also note that the GTX 970 requires signed firmware from NVIDIA to >> use >> any acceleration, and we haven't quite yet figured out how to get >> that >> going. This means that all you get is modesetting, no acceleration. >> Esp with a 4K screen, using llvmpipe may feel slow if you use a GL >> compositor, as many modern desktops do. >> >> -ilia >> > > Thanks for the quick response. I'm having a hell of a time with the > nvidia driver since I have three 4K monitors which hook up to the GTX > 970 card, but in linux it will only drive two of the 3 monitors. The > monitors do have the dual internal panels each running at 1920x2160 or > something like that. For some reason nvidia only drives 4 of the panels > (two monitors) per GPU...
Kepler+ GPUs only have 4 CRTC's, so you can only scan out 4 things at a time [pre-Kepler have only 2 CRTC's]. However perhaps you can have a single CRTC split an image up into 2 encoders, I don't really know how that works, esp in the context of DP-MST, where it's really a single encoder. > > Is the MST support imminent? or off into the future? It's on the horizon... a horizon, of course, being an imaginary line that keeps moving further away as you attempt to approach it :) Here's Ben's tree from a year ago (which BTW has no support for your GPU at all): http://cgit.freedesktop.org/~darktama/nouveau/log/?h=devel-mst AFAIK he's been putting it off, trying to combine it with a conversion to atomic modesetting. -ilia _______________________________________________ Nouveau mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/nouveau
