[CentOS] DVI + VGA?

MHR mhullrich at gmail.com
Tue Aug 5 16:44:27 UTC 2008

On Sun, Aug 3, 2008 at 3:12 AM, Marco <mailinglist at blah.li> wrote:
> As far as i know you don't need to change anything in your xorg.conf. if you
> have any horizontal / vertical sync settings (Hz) in your conf you can
> remove them. DVI is digital and don't need them.
> correct me please if Im wrong.

That seems to be true, but until I unplugged the VGA cable, nothing
changed.  The screen went black (no input, complete with the short "no
video signal" message from the screen) until I reset the gdm.  Then it
recognized and used the DVI for output.

It works fine, but I'm not so sure about having both cables connected
at the same time.

NVidia's tech person said that I should only use one cable per
monitor, although having both connected won't hurt anything.

There is a setting that can be used in xorg.conf to tell X what order
to use in scanning for a monitor, but I figured it's just easier to
have one cable plugged in.

The difference in the video itself (DVI vs. VGA) is quite startling -
visibly cleaner and crisper.

Thanks everyone!


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