On Tue, Jun 16, 2015 at 4:15 PM, Stephen Adler <[email protected]> wrote: > On Tue, 2015-06-16 at 16:00 -0400, Ilia Mirkin wrote: >> 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 >> > > Thanks Ilia, you certianly seem to know what your talking about... > So... how about this question? Would you be familiar with the Base > Mosaic and/or SLI mosaic configurations for the nvidia driver? > specifically if they work with geforce cards? I know they work with > quadro cards. (At least the base mosaic does with the quadro cards.) > > I may just get me another card to solve the 3 monitor problem.
Nope, sorry. Not really familiar with what the blob drivers offer in that regard. I will say that if the actual HW supports your configuration (e.g. it works fine in Windows with the exact same cables / connectors / etc), chances are you can file a bug with them somehow, not sure what the response rate is though. I do know that things will go much smoother if all your monitors are hooked up to a single GPU than to multiple GPU's. -ilia _______________________________________________ Nouveau mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/nouveau
