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Old 08-04-2004, 11:45 AM   #1
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Registered: Aug 2004
Location: Sterling, NY
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new monitor - no gnome

I put a different monitor on my G4 and now Gnome will not load, the screen just goes blank when I should see my GUI login screen. I presses cntrl-alt-F1 to drop out of the GUI environment and ran Xautoconfig. This enabled me to be able to start my gnome session. The problem is that I can only get 640x480. When I try to bump it up to 800x600 my screen goes loony. I've gone into the display settings (in the desktop environment) and configured the monitor and video adapter but still get the same results. I've looked at my XF86Config file and it only shows the 640x480 setting. Is it prudent to add additional resolution setting in this file? Any ideas?

Old 08-04-2004, 03:14 PM   #2
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The XFree86Config file is certainly the right place to add new video modes. The desktop settings in Gnome won't work if the X server doesn't know about corresponding modes.

The easiest way to do this is to reconfigure X-Windows using your distribution's setup tool, or (failing that) by running xf86config as root. Either of these will write out a new XFree86Config file, based on your hardware's reported settings.

If by “loopy” you mean that you can see the image on the screen but it won't sit still (shuffles back and forth or up and/or down, possibly with lines going across, and/or loss of colour), then you are running a mode whose refresh rate is outside the range your monitor can handle. Update the HorizSync and VertRefresh values in XFree86 with the values from your monitor's manual (HorizSync is often called the horizontal scan rate (MHz), and VertRefresh the refresh rate (Hz)). If in doubt, put 60 for the VertRefresh (most resolutions should work at 60Hz!), and then try increasing it (say 60-70 then 60-80) until you get something that looks better.

Hope that helps,

— Robert J. Lee
Old 08-04-2004, 05:50 PM   #3
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thanks for the info rj.
For some reason I wasn't able to run the x config tool for yelow dog.
So I started looking at the XF86config file. The refresh rates looked good so I added a couple of
resolution entries for 1024x768 and 800x600 since all I saw were 640x480 entries. I restarted gnome worked.


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