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.
Cory Papenfuss wrote:
If you believe your EDID data, you cannot run 720p. Indeed, the
fact that you forced it to 45kHz and it was "jumpy" is an indicator
that it will not sync there. Look here (or lots of other places in
the 'net I'm too lazy to look up right now):
http://www.plasmatvbuyingguide.com/dtv-hdtv-comparison19.html
The bottom chart shows
480i: 31.5kHz/60Hz
720p: 45.0kHz/60Hz
1080i: 33.75kHz/60Hz
I did a Xorg -probeonly and it did not find any compatible
resolutions over 848x480, however I was not supprised since I've read
that many do not have proper EDID info. It states that my hsync is
30-35kHz and my vsync is 58-62Hz. Using modeline calculators it
appears that if I specify 960x720p that it is not possible to satisfy
both sync requirements. I tried bumping the max hsync up to 45 but
was greeted with a "jumpy" screen so it appears is that part may
correct.
Here's the modeline that I use. I believe it's pretty much
frequency-spec compliant with the standard (or at least as close as
can be made with NVidia's restrictions)
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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