[CentOS] dell sc420 connect to LCD 32" at 1366x768

[Sean O'Connell]

On Thu, 2005-08-25 at 09:40 -0500, Jerry Geis wrote:
> Hi,
> 
> I am attempting to connect my dell SC420 to a 32" LCD at 1366x768.
> I have attached my currect config file and currect X start log.
> 
> How do I massage the xorf file to run at the native resolution of the LCD?
> 
> It currently runs but is in a virtual mode. The screen scrolls.
> 
> Any help is appreciated. I am using Centos 4.1.
> 
> Jerry

The problem is Xorg doesn't know anything about the mode 1366x768, so
you have to construct it.

>(II) I810(0): Monitor0: Using hsync range of 31.00-70.00 kHz
>(II) I810(0): Monitor0: Using vrefresh range of 50.00-85.00 Hz
>(II) I810(0): Not using mode "1366x768" (no mode of this name)
>RESOLUTION 1600x1200

Fortunately, constucting a mode is far simpler these days then in the
days of yore, as the Xorg output gives you all the needed parameters to
construct a modeline:

> (II) I810(0): clock: 85.5 MHz   Image Size:  700 x 400 mm
> (II) I810(0): h_active: 1366  h_sync: 1494  h_sync_end 1624 h_blank_end 1798 h_border: 0
> (II) I810(0): v_active: 768  v_sync: 770  v_sync_end 776 v_blanking: 795 v_border: 0

Which should equate to something like this:

Modeline "1366x768" 85.5 1366 1494 1624  768 770 776 795

Add this to your /etc/X11/xorg.conf, and run X and see what shows up in /var/log/Xorg.0.log

Hope this helps,
Sean
-- 
Sean O'Connell
Office of Engineering Computing         oconnell at soe.ucsd.edu
Jacobs School of Engineering, UCSD      858.534.9716 (49716)