Most PC video cards can't even come close to outputting HDTV
on the TV-out. On the TNT, this is a function of which TV encoder
is used and I've never seen one that could do more than 800x600.
NVIDIA's Linux drivers don't support modes other than 640x480,
800x600 and for the few encoders that can do it, 1024x768. I've
never actually seen anybody do HDTV under Linux. I wouldn't
be surprised if there weren't any drivers that supported it
on anybody's hardware.
Mark.
On Thu, 30 May 2002, Doug McClendon wrote:
> I am astounded by the lack of resources (as reported by google)
> available regarding using HDTVs with xfree86. The only thing I found
> was a post long ago to this list. The only person who answered said
> "this is a question for nvidia, regarding their tv-out support".
>
> To cut off similar responses: I'm talking about treating the hdtv as a
> fixed frequency monitor, taking its input from a standard hd15 monitor
> cable (or in my case, potentially via an hd15->yuv converter from audio
> authority).
>
> Currently, with my TNT, the default 60HzV 31.5khzH 21.5MHzDC modeline
> for 640x480 provides reasonable output, except that 10-15% of the pixels
> of the top and left of screen are not visible (i.e. off screen). Now,
> reading the handy video mode timings FAQ, it suggests that in such a
> case you move to a higher dot clock. Personally I don't want to
> endanger my (brothers) hdtv. Playing around with a multisync monitor,
> just jacking up the dotclock number in the modeline also ends up
> increasing the vertrefresh, which I'm _guessing_ could be a bad thing on
> the hdtv, which I'm _guessing_ is probably only going to be happy at 60hz.
>
> Anyway, clearly if I spent even more time than I have researching this
> issue, and didn't fear destroying a few hdtv's, I could probably run
> across the right modeline. But what perplexes me is that I can't seem
> to find any resources on the issue. Its like one of the first things
> that jumps out in my mind that I would do if I bought an hdtv. I can't
> believe there isn't more stuff/chatter on the net regarding this.
>
> For instance, its a 16/9 1080i hdtv. Clearly this implies(?) that the
> optimal progressive 60hz resolution would be 960x540(with square
> pixels). But personally I'd be satisfied at the moment with 640x480@60p
> or 854x480@60p, or roundabouts there. Just whatever the good dvd
> players output???
>
> Anybody out there doing this? I can't be the only one?
>
> Anybody want to enlighten me as to how I'm wrong in my going assumption
> that 'hdtv support' is completely a software/modeline issue? (unless
> you care about the convenience of yuv/y-pb-pr cables coming straight out
> of the video card).
>
> Thanks for any help. I'd like to have a good idea what I'm doing, and
> what the risks to the TV are, before I do anything.
>
> Also, the modeline generator web pages out there don't seem to be doing
> much for me.
>
> -dmc
>
>
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