Allright, this is driving me nuts. I'm running Redhat 8.0 and everything is working fine except for this minor problem with my monitor...It flickers to no end!! It's that edge-of-the-screen flickering thing that after about an hour gives me a raging headache and has really limited use of my linux box. God forbid I've been using Widnows as a back-up until I can get this figured out. *eeeeee*.

Anyway, I'm running on an ATI Raedon 9000 v.c., and I know that's up and working correctly, but I'm unable to customize any settings with my monitor. There is no "custom" monitor selection, and it won't probe it. My monitor is a Sylvania F93 and has rather high refresh rates and horizontal and vertical sync rates. I set them all to what they should be using one of the "Generic" monitors, but the refresh rates on them only go up to 76hz and I need at least 85hz.

I have no clue what to do next, short of buying a new monitor which I don't want to do because I like this one and it works just fine elsewhere... (windows, eeee.)

try running:

xf86cfg -textmode

(assuming xfree86 4.0 or higher) as root, in a console. This should give you the ability to enter custom values for your monitor. Don't worry about changing any of the other settings (unless for some redhat's version has other things wrong or whatever, you should be able to tell when you enter the monitor selection, from whats already selected.)

you'll have to play around with the sync lines for a while... that or as the previous poster suggested using one of the automated scripts.. I don't personally like them as they tend to mess up other things that are already working (aka, your mouse or keyboard etc..)

I'll post the portion of my /etc/X11/XF86Config file that pertains to my monitor (I also have a sylvania though not f93).. you can use it as a base and tinker to your delight. --- I'm assuming a Slackware box here... Your mileage may/will differ with another distro (in fact may well differ with a Slack box)

Section "Monitor"
Identifier "My Monitor"
# HorizSync 31.5-64
HorizSync 31-91.1
VertRefresh 50-85
EndSection

Section "Device"
Identifier "Framebuffer"
Driver "nvidia"
#VideoRam 4096
# Insert Clocks lines here if appropriate
EndSection

Section "Screen"
Identifier "Screen 1"
Device "Framebuffer"
Monitor "My Monitor"
# DefaultDepth 8
# DefaultDepth 16
DefaultDepth 24
# DefaultDepth 32

Subsection "Display"
Depth 8
Modes "1024x768" "800x600" "640x480"
EndSubsection
Subsection "Display"
Depth 16
Modes "1024x768" "800x600" "640x480"
EndSubsection
Subsection "Display"
Depth 24
Modes "1152x864" "1024x768" "800x600" "640x480"
EndSubsection
Subsection "Display"
Depth 32
Modes "1152x864" "1024x768" "800x600" "640x480"
EndSubsection
EndSection

Section "ServerLayout"
Identifier "Simple Layout"
Screen "Screen 1"
InputDevice "Mouse1" "CorePointer"
InputDevice "Keyboard1" "CoreKeyboard"
EndSection