Getting widescreen resolution on my widescreen LCD tv

[Beso]

2008/4/15, Arthur Pemberton <pemboa at gmail.com>:
>
> On Mon, Apr 14, 2008 at 12:47 AM, Arthur Pemberton <pemboa at gmail.com>
> wrote:
>
> > I have a Maxtent  26" HD-Ready LCD TV which is 16:9 and rated for up
> >  to 1280x1024 despite my best efforts I have been unable to get a
> >  working widescreen res with Xorg (updated) on Centos5
> >
> >  The machine in question is an Optiplex GX270, I have tried the i810
> >  driver with the integrated intel vga without success, through my
> >  research I found that the particular chipset I had simply couldn't
> >  support widescreen (I tried this for about 4-5 hrs) I settled on
> >  800x600 after exhausting all my efforts it worked, but the aspect
> >  ratio was off
> >
> >  So I bought an AGP GeForce FX 5200 so that I could get to those higher
> >  resolutions. http://www.maxentusa.com/uploads/files/191.pdf shows the
> >  resolutions that the tv supports. I eventually for 1280x1024 to work
> >  with the nv driver, but mythtvfrontend (the main reason I have Xorg
> >  installed for) showed in what seemd like 8bit colors, just black red
> >  and green, unuseable. And the fonts were too small. It took me several
> >  hours just to get 1280x1024 to work, and I am kinda exhausted with
> >  trying.
> >
> >  What I am aiming for is 1366 x 768 at 60Hz. Even at 1024x768, running
> >  myfrontend seemed to crash fuxbox sending me back to GDM. Also, at
> >  1280x1024 the display seems like it would simply stop refreshing till
> >  i soft reboot the machine (via ssh).
> >
> >  I would love to solve this problem finally. Please assist -- I will
> >  provide info as requested.
> >
> >  Thank you,
> >  Arthur Pemberton
>
>
>
> I haven't had any further luck with this problem.


of course you haven't. if you search on the internet you'll see that this tv
has a maximum rgb resolution of 1280x1024.
well, the following is the correct modeline to use for 1366x768 at 60Hz:

Modeline "1360x768 at 60" 84.50 1360 1392 1712 1744 768 783 791 807


the 1920x1080 at 60 isn't usable since you'll need to modify also the
horizontal and vertical sync timing or the mode would break your tv.
you should add the modeline into the monitor section, remove all the other
options in the monitor section (not the identifier and name). now this
should work if your monitor is able to read the modeline. ifit still isn't
able to read it then try this other modeline generated with gtf (ie. the
nvidia modeline generator)

# 1368x768 @ 60.00 Hz (GTF) hsync: 47.70 kHz; pclk: 85.86 MHz
  Modeline "1368x768_60.00"  85.86  1368 1440 1584 1800  768 769 772
795  -HSync +Vsync

it should not work since it should be the one used by the board, but you'll
never know. if this still doesn't work, then try connecting the monitor via
dvi-d or s-video. if you need to buy another videoboard, then maybe you'll
be better using only 1280x720 at 60Hz. this way you'll be able to still use a
widescreen resolution and not go over the maximum rgb supported resolution
(noted as 1280x1024 in the tv specs).
if you need to test modelines use this tool:

http://xtiming.sourceforge.net/cgi-bin/xtiming.pl

but be sure to insert the values supported by the monitor in the upper
applet so that the generator advices you if you break the supported mode.
-- 
dott. ing. beso
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