Red Hat LINUX 7.2 Manual page 177

Section 13.15:Configuring X
If you don't find your monitor among the listed makes and models, you can
specify your monitor's horizontal and vertical sync frequencies by choosing
Custom in the list. Refer to your monitor's documentation for information
about its correct frequency rates. Be careful! Don't select a frequency range
which exceeds your monitor's capacity, because you could damage or destroy
it.
Once you have selected your monitor's make and model, a dialog will inform you that your card will
be probed for its correct display settings. Don't worry if your monitor blinks during the process; that's
normal.
You don't have to probe your video card. If you choose
you want to accept the settings on the
will ask you how much memory is on your video card, then you will be able
to select your chosen resolution (see Figure 13–6, Select Video Modes).
Figure 13–6 Select Video Modes
You can choose modes ranging from 8-bit to 24-bit, depending on the power of your computer and
how many colors you want displayed. In each of the mode columns, you'll find resolution choices
listed; using your
[Tab]
by pressing .
[Space]
Monitor Not On the List?
If You Don't Want Linux to Probe
key, position the cursor in the boxes next to your chosen resolution. Select one
No
Monitor Probe screen, the next dialog
when asked if
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