detecting # of monitors on dualhead gfx card

[Andy Ritger]

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


On Wed, 24 May 2006, Jacob Zachariah wrote:

> Hi,
> I'm running Redhat Linux 7.3 on my target, with an
> nVidia GeForceFX5200 dualhead graphics card and nVidia
> drivers 76.76)
> 
> When i start X, it figures out how many monitors are
> plugged into the card & sizes the display accordingly.
> I think it may be using the nvidia.o, nvidia_drv.o
> modules for that determination.
> 
> In /var/log/Xorg.0.log, it prints out the number of
> monitors correctly.
> 
> (II) NVIDIA(0): Connected display devices(s): CRT-0,
> CRT-1
> (--) NVIDIA(0): CRT-0: maximum pixel clock : 350 Mhz
> (--) NVIDIA(0): CRT-1: maximum pixel clock : 350 Mhz
> Loading sub module "ddc"
> 
> In the single monitor run, the CRT-1 was absent. 
> 
> But for my purposes, on bootup & before X is started,
> i have to find out how many monitors are plugged into
> the card & run my programs accordingly. Starting X
> will be *after* the monitors are detected.
> 
> I don't believe I can use the NV-CONTROL extension as
> that needs X & i won't have X running at that point.
> 
> How would I find out the number of monitor present?
> Would there be some way to use nvidia.o nvidia_drv.o
> /dev/nvidia* to get that information?
> 
> Thanks in advance
> 
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