hdmi output not detected by xrandr

[sashan]

On Tue Nov 29 00:00:34 2011, sashan wrote:
> On Sun Nov 27 18:51:03 2011, sashan wrote:
> > On Sat Nov 26 22:13:49 2011, Keith Packard wrote:
> > > On Sun, 27 Nov 2011 16:01:52 +1100, sashan <sashan at zenskg.net> wrote:
> > > > Hi
> > > > 
> > > > I'm trying to figure out why the external hdmi output on my laptop doesn't work
> > > > but am not sure where the problem is or if this is the right mailing
> > > > list.
> > > 
> > > I'd bet money that the hdmi connector is only hooked up to the nVidia
> > > device, which means you'd have to use that one to display anything over
> > > that connector.
> > > 
> > 
> > Yeah that might be the case but the document
> > http://www.nvidia.com/object/LO_optimus_whitepapers.html about nvidia optimus
> > basically says that the datapath to the physical monitor is always through the
> > Intel IGP and then the IGP is responsible for writing to the display. The
> > nVidia chip is between the application and the IGP, therefore I expected that
> > the IGP would be connected to the HDMI port. However I'm probably wrong and
> > would appreciate if you or someone could clarify my understanding about how this
> > is meant to work.
> > 
> > The laptop is a Dell XPS 15z
> > (http://reviews.cnet.com/laptops/dell-xps-15z/4507-3121_7-34714594.html)
> > 
> 
> I've been able to get output from the HDMI port onto the monitor by adding the
> ModulePath to the nvidia driver to xorg.conf, so it looks like you're right
> about the fact that it's connected to the nVidia gpu.
> 
> The problem now is that the higher resolutions aren't detected. The highest it
> goes is 640x480. I've tried to manually add a modeline but this is ignored. The
> xorg log shows this when it encounteres the modeline it can't validate:
> 
>   (WW) NVIDIA(0): No valid modes for "1920x1080"; removing.
> 
> Is there anyway I can fix this? I've attached the xorg.conf and xorg log file.
>

Never mind I've got this working. ReadEDID was set to false in the xorg.conf I
posted. I deleted that and X is able to correctly detect modelines.