detecting # of monitors on dualhead gfx card

[Andy Ritger]

The libnvidia-cfg library and the NVIDIA X driver both query
information like connected display devices through the NVIDIA
kernel module.  The details of the communication between the kernel
module and the user-space driver components can change from release
to release; libnvidia-cfg is meant to abstract those differences
and provide a consistent interface to be used by nvidia-xconfig
and anyone else who wants to use it.

Unfortunately, I do not believe it is possible to get libnvidia-cfg
working with older NVIDIA drivers.

Probably the best course of action is to work with NVIDIA to resolve
the PDR and PBO issues you are seeing.  If you haven't already done so,
contact the linux-bugs email alias and provide information on how
we can reproduce and investigate the problem.

Thanks,
- Andy


On Wed, 24 May 2006, Jacob Zachariah wrote:

> Hi Andy,
> 
> Thanks much for the tip! I see that version 8174 & up
> include the nvidia-xconfig utility & the
> libnvidia-cfg.so.xxx library that it uses. 
> 
> nvidia-xconfig --query-gpu-info does print out the CRT
> information.
> 
> For my target device though, for now, I have to stick
> with 7676 drivers as I ran into some issues(as yet
> unresolved) when i ran tests on the
> NV_PIXEL_DATA_RANGE & PixelBufferObject using the
> 8174,8178 drivers. (They were unusually slow for some
> reason. Same code ran fine with the 7676 drivers)
> 
> Is there a way to get the nvidia-xconfig/libnvidia-cfg
> built/working with the 7676 drivers?
> 
> Or 
> 
> Would you know how the # of CRTs information, as seen
> in the Xorg.0.log, gets passed to X?
> 
> Thanks much!
> 
> --- Andy Ritger <aritger at nvidia.com> wrote:
> 
> > 
> > Hi Jacob,
> > 
> > You are correct that NV-CONTROL could only be
> > queried once X
> > is running.  However, with the latest NVIDIA
> > drivers, you can use:
> > 
> >     nvidia-xconfig --query-gpu-info
> > 
> > to query basic information about the NVIDIA GPUs in
> > your system;
> > this will talk to the NVIDIA kernel module to probe
> > the needed
> > information.
> > 
> > I hope that helps,
> > - Andy Ritger
> 
> 
> __________________________________________________
> Do You Yahoo!?
> Tired of spam?  Yahoo! Mail has the best spam protection around 
> http://mail.yahoo.com 
>