CentOS - Aug 2005 - Setting X in 1024x768 60 hz refresh for LCD TV viewing

I am trying to hook up linux to an LCD 1333x768 LCD TV.
XP in 1024x768 show up just fine. X does not.

I have set the screen preferences to 1024x768. I have edited the
xorf.conf file instead of have a range from 50 - 70 I change it to be
only 60. I start X and it still comes up on my A70F monitor but
still will not show on my LCD TV.

xvidtune does not run on this PC. It says something about "video modes
are not tunable on this chip".

My PC at this time is a dell SC420.

Thanks for any input as to get the display working on the LCD TV
under linux.

Jerry Geis <geisj at pagestation.com> wrote:
> I am trying to hook up linux to an LCD 1333x768 LCD TV.
> XP in 1024x768 show up just fine. X does not.
> I have set the screen preferences to 1024x768. I have
> edited the xorf.conf file instead of have a range from 50
> - 70 I change it to be only 60. I start X and it still
comes
> up on my A70F monitor but still will not show on my LCD TV.
You also need to change the horizontal scan range.
Changing the vertical will not do it.

Consider:

1.  Open up the manual for the LCD and get the _exact_
vertical _and_ horizontal scan ranges.

2.  Use the _exact_ scan ranges for VESA 1024x768 at 60Hz.

3.  Booting Linux with the VESA 1024x768 framebuffer (e.g.,
vga=791 I believe?) and using that X server instead of the
video card's driver.

#1 is most ideal.
#2 is an option to explore only if you can't do #1.
#3 should be a "last resort" (low performance)
> xvidtune does not run on this PC. It says something about
> "video modes are not tunable on this chip".
Please don't tell me it's an Intel integrated video ...
(I've had numerous scan range issues with such)
> My PC at this time is a dell SC420.
Yep, it is.
> Thanks for any input as to get the display working on the
> LCD TV under linux.
XP merely defaults to VESA modes.
X11 tries to use the monitor at the most optimal rate by
default, hence why your horizontal/vertical needs to be
_exact_.

-- Bryan

P.S.  DVI solves most of these issues.


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