setting CRT parameters

[Edward Matuszak]

> -----Original Message-----
> From: redhat-install-list-bounces at redhat.com
> [mailto:redhat-install-list-bounces at redhat.com]On Behalf Of Bob McClure
> Jr
> Sent: Saturday, June 04, 2005 2:58 AM
> To: Getting started with Red Hat Linux
> Subject: Re: setting CRT parameters
>
>
> On Fri, Jun 03, 2005 at 06:49:09PM -0700, Edward Matuszak wrote:
> > > Subject: Re: setting CRT parameters
> > >
> > >
> > > On Thu, Jun 02, 2005 at 09:46:41PM -0700, Edward Matuszak wrote:
> > > > I recently changed monitors, and the original settings used by
> > > Redhat linux
> > > > no longer work.
> > > > Where does the system get the values for resolution, scan rate,
> > > etc.? The
> > > > new monitor is unable to display anything as soon as the x
> > > windows subsystem
> > > > comes up. i.e. black screen
> > > >
> > > > I can remotely access the system, so I would like to reset to a
> > > minimum vga
> > > > configuration via config files, startup scripts, etc.???
> > > >
> > > > thanks.
> > >
> > > Try (as root)
> > >
> > >   system-config-display --reconfig
> > >
> > > Cheers,
> > > --
> > > Bob McClure, Jr.             Bobcat Open Systems, Inc.
> > >
> > > _______________________________________________
> > Did not work ... command not found (from a terminal session).
> >
> > I looked in /etc/sysconfig, but didn't see anything obvious.
> >
> > I can only access via ssh/telnet, so I need to find the relevant config
> > file, setup script, or whatever the system uses to set up the
> CRT refresh
> > rate, resolution, etc.
>
> See
>
> http://www.rhil.net/docs/faq.html#text_login
>
> to see how to at least get a text-mode login.
>
> I forgot to ask what version of RedHat or Fedora Core.  In earlier
> versions, the command was
>
>   system-config-xfree86 --reconfig
>
> and before that
>
>   redhat-config-xfree86 --reconfig
>
> and before that
>
>   Xconfigurator --reconfig
>
> See also
>
> http://www.rhil.net/docs/faq.html#x_fails
>
> Cheers,
> --
> Bob McClure, Jr.             Bobcat Open Systems, Inc.
> robertmcclure at earthlink.net  http://www.bobcatos.com
> God is more interested in our availability than our ability.
>
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It's Linux 2.4.20-8 and the command:

 redhat-config-xfree86 --reconfig

did the trick.  Thanks!

The frame rate, however, seems to be 60hz ( It looks like it is flickering),
and there doesn't seem to be a way to directly specify it.  The vertical
refresh rate is given as a range (e.g. 50.0-160.0) in the "advanced" option
tab under display settings.  It seems to think it has an ATI Mach64 video
card, and I don't have a clue if that is correct since this is an old
e-machine with the video built in to the motherboard.

Is there a way to verify what the actual chipset is and what X has set the
parameters to?  xdpyinfo doesn't show scan freq, and the config file set up
by the "redhat-config-xfree86 --reconfig" command doesn't seem to specify it
either.  (It's not obvious, anyway.)  I vaguely recall that when I had the
original monitor connected it did not flicker (i.e. not set to 60hz)

It would be nice to set the scan rate to 72hz.

Ed