By the way, did you enter VertRefresh to the correct section of the correct file?
In my Linux (not Red Hat or Debian), the file is /etc/X11/XF86Config.
It should look something like this:
Code:
Section "Monitor"
Identifier "Samtron"
# HorizSync is in kHz unless units are specified.
# HorizSync may be a comma separated list of discrete values, or a
# comma separated list of ranges of values.
# NOTE: THE VALUES HERE ARE EXAMPLES ONLY. REFER TO YOUR MONITOR'S
# USER MANUAL FOR THE CORRECT NUMBERS.
HorizSync 30-96
# HorizSync 30-64 # multisync
# HorizSync 31.5, 35.2 # multiple fixed sync frequencies
# HorizSync 15-25, 30-50 # multiple ranges of sync frequencies
# VertRefresh is in Hz unless units are specified.
# VertRefresh may be a comma separated list of discrete values, or a
# comma separated list of ranges of values.
# NOTE: THE VALUES HERE ARE EXAMPLES ONLY. REFER TO YOUR MONITOR'S
# USER MANUAL FOR THE CORRECT NUMBERS.
VertRefresh 50-160
Modeline "1600x1200" 202.50 1600 1664 1856 2092 1200 1201 1204 1242 +hsync +vsync
EndSection
That modeline is just my own tweak of that resolution, but nevertheless, VertRefresh should be in proper monitor section. If you have more than one monitor, make sure you're editing the right one.