[CentOS] How to display laptop screen on LCD TV?

Bob McConnell rmcconne at lightlink.com
Sun Feb 14 13:13:48 UTC 2010

hce wrote:
> Hi,
> I am running CentOS 5.2 on Acer laptop, I try to display laptop screen
> on a LCD TV via VGA cable. It was fine while PC was booting in text
> mode, but as soon as I started X Window, the LCD TV has error
> "Unsupported signal, adjust your PC out".
> How can I adjust or may be regenerate an xorg.conf for the LCD TV
> (Sony KDL-40V5500)?

This is not an uncommon problem with flat panel displays, and is hardly 
limited to one distribution. Step one is to find out what resolutions, 
horizontal and vertical frequencies the internal display can handle. 
Step two is to find out what combinations the video chips can generate. 
Step three is finding out which combinations the TV can accept. Once you 
determine where all three sets overlap, you configure X to use the 
mutually acceptable options. You may end up with an unusable lowest 
common denominator doing this, so look into any multi-display options 
while you are collecting the data.

Bob McConnell

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