On Mon, 12 Dec 2005, Richard Shaw wrote:
It looks like you're right. I tried a 1080i modeline and it did work. I would
be happy with that but at 27" the text in Firefox was so I couldn't read it.
Right now I'm messing with 540p which I have working but it doesn't look very
good. It could be I'm trying to get it to work in 4:3 ratio instead of 16:9.
I don't really want to have it in widescreen since it's not a widescreen
television. I guess I shouldn't complain too much, the picture is otherwise
good and I only paid $450 for it.
Here's the "same" 1080i modeline converted ot progressive-scan
540p.
ModeLine "540p" 37.092 960 980 1004 1100 540 542 547 562 -hsync -vsync
Basically everything is divided by 2 but the interlace isn't there.
That means you still get 33.72kHz horiz, but 60Hz vertical. It's a 16:9
ratio (960x540), but at least it's some semblance of "HDTV standard." You
may be able to coerce the 4:3 ratio you want by setting the DisplaySize in
your xorg.conf... I do that for getting 4:3 with my non-square-pixel
720x480 modeline on my 4:3 set. Something like
DisplaySize 200 150
(since 200/150 = 4/3)
If you really want square pixels and a 4:3 and progressive scan,
you're stuck somewhere between 640x480 and 800x600. That's all the better
the TV will do.
-Cory
ModeLine "1080i" 74.175824 1920 1960 2008 2200 1080 1084 1094 1125
interlace -hsync -vsync
That puts out 33.72kHz HSYNC and 29.970 VSYNC. It will be
underwheliming to use as a desktop resolution because it will be huge and
very flickery with the interlacing at 30Hz. It should work with the TV
though.
One of the reasons your modeline generate probably didn't work is
because they rarely offer the "interlace" option. That effectively halves
the horizontal scanrate required for a given resolution. 30-35kHz pretty
much limits you to somewhere between 640x480-800x600 in computer-ese
resolutions. Not much more over EDTV.
Cheers
-Cory
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--
*************************************************************************
* Cory Papenfuss *
* Electrical Engineering candidate Ph.D. graduate student *
* Virginia Polytechnic Institute and State University *
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