On Sat, 31 May 2003, Brian L Scipioni wrote:
> I have an nvidia TI-4200 card running under RHLinux 8.0. My monitor is an EPSON
> TW100 projector. I am using the new nvidia driver from nvidia. Both the TI-4200
> and the TW100 support the HDTV modes (1280x720 - 720p and 1920x1080 - 1080i/p).
>
> I have these modes, as well as several of the standard VESA modes, listed in my
> "Modes" section. When I cycle through the modes, my 720p mode (I don't have the
> 1080 listed) gets skipped. I am assuming this is because the standard VESA
> modelines are built into XFree86 but I have to define the correct modelines myself
> for the HDTV modes. Is this true?
Yes. If the mode isn't in the XFree86 internal mode pool, you have
to have the modeline listed explicitly in your Section "Monitor".
>
> Now this is a really elementary question. Do the modelines refer to graphics card
> capabilities, monitor capabilities, or both?
>
It describes the timings that the monitor uses for that mode. It
needs to be within both the card's and the monitor's capabilities.
> Does anyone know where I can get the correct modelines for my combination of card
> and projector? I can't find them anywhere.
>
> Also, I know some of the information like sync polarities and my pixel clock for
> my projector..Is there a simple recipe for computing my modelines if I have to do
> them myself? I couldn't find in-depth documentation to do this either.
>
The "gtf" untility that shipped with XFree86 4.3 is pretty good at
generating modelines.
The specs on the web:
http://www.projectorcentral.com/projector_details.cfm?part_id=1731
give the clock rates. I assume you are using the DVI input?
If so...
$ gtf 1280 720 60
# 1280x720 @ 60.00 Hz (GTF) hsync: 44.76 kHz; pclk: 74.48 MHz
Modeline "1280x720_60.00" 74.48 1280 1336 1472 1664 720 721 724 746 -HSync +Vsync
Will give you a 60 Hz 1280x720 mode that's well within your monitor
specs that the DVI connector should be able to generate.
I suspect that the 1080i feature only works using the HDTV in
and not the DVI-I. It probably doesn't display at that resolution,
but can sync to it and downscale. I don't think the NVIDIA drivers
can output those kinds of TV signals yet anyhow, so hopefully you
are using DVI.
Mark.
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