Monitor sync rate problems

[sgswartz]

I have a gateway vivitron21 monitor - ATI Radeon VIVO vid card and RedHat 7.3

Here is the problem. Linux boots fine. Enters the text shell fine, and loads Xwindows system fine.

Once in Xwindows if I <Ctl> <Alt> <F?> to access a shell or another X session, my monitor shuts off and displays the "timing signal frequencey" error (or something like that). The only way to revive the monitor is to reboot.

Anyone have any ideas?

Thanks

[mdwatts]

Check your monitor/video card settings in /etc/X11/XF86Config-4 and ensure the refresh rate etc. are set correctly.

i.e.

HorizSync 30-121
VertRefresh 50-160
ModeLine "1800x1440/70Hz" 250 1800 1896 2088 2392 1440 1441 1444 1490 +HSync +VSync
ModeLine "640x480" 25.175 640 664 760 800 480 491 493 525

Modes "1800x1440/70Hz" "640x480"

Those are for mine of course. Have a look at the specs in your video card and monitor manuals or search the web to find the specs or examples you can use.