[Nouveau] support for dp 1.2
adler at stephenadler.com
Tue Jun 16 13:15:30 PDT 2015
On Tue, 2015-06-16 at 16:00 -0400, Ilia Mirkin wrote:
> On Tue, Jun 16, 2015 at 3:53 PM, Stephen Adler <
> adler at stephenadler.com> wrote:
> > On Tue, 2015-06-16 at 15:47 -0400, Ilia Mirkin wrote:
> > > On Tue, Jun 16, 2015 at 3:33 PM, Stephen Adler <
> > > adler at stephenadler.com> 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
> single CRTC split an image up into 2 encoders, I don't really know
> that works, esp in the context of DP-MST, where it's really a single
> > 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 :)
> Ben's tree from a year ago (which BTW has no support for your GPU at
> AFAIK he's been putting it off, trying to combine it with a
> to atomic modesetting.
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.
thanks for all the feed back!
More information about the Nouveau