On 7 Nov 2002, Diego SANTA CRUZ wrote:
> Hi there,
>
> Whenever I try a low res mode like 800x600 on my laptop, XFree86
> automatically selects a doublescan mode, at the expense of a higher
> vertical frequency (I get doublescan @ 60 Hz, but I would prefer
> singlescan @ 85 Hz or better). I think it is because XFree picks the
> mode with the highest dot-clock that still fits the monitor and video
> card specs, instead of the highest vertical frequency.
It's probably an error that it picks a doublescan 60 Hz mode
over a non-doublescan 85 Hz mode. We should probably remove
the 60 Hz doublescan modes from the list and leave only the
high frequency doublescan modes, or modify the logic that chooses
the modes.
>
> Is there any way to disable doublescan modes? Or to modify the order of
> preference for selecting modes at a given resolution? I looked on the
> man pages but I did not find anything.
The only way to override XFree86's internal mode is to provide
a mode by the same name in your Monitor section.
>
> I know I could do it by listing all the desired modes in the monitor
> section and then specifying those, but I would like to avoid duplicating
> XFree's internal mode list. However, if this is the only currently
> available solution, where can I get the definition of standard modes
> used by XFree internally?
The list is in the server tree at
xc/programs/Xserver/hw/xfree86/common/modedefs
Modeline "800x600" 56.3 800 832 896 1048 600 601 604 631
should do it. That's 85 Hz.
Mark.
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