How to find HorizSync / VertRefresh rates?

[Tom Evans]

On Mon, 2007-04-30 at 11:02 +0200, Victor Engmark wrote:
> Hi all,
> 
> I'm trying to create a pristine xorg.conf, but I've been unable to
> find proper values for HorizSync and VertRefresh for my Dell Latitude
> D610.

Don't bother trying. If it works when you leave them unspecified, don't
think any more about it.

If it still doesn't work however, the easiest way is to construct a
valid modeline specific to your monitor. Xorg can actually tell you what
to put into your xorg.conf, see section 5.4.3.2 of the FreeBSD Handbook
[1]

The quickest way to get these values out is to grep your Xorg log (even
from a failed run of Xorg). Eg (quoting from the Handbook) :

$ grep -A 4 'Supported additional Video Mode' /var/log/Xorg.0.log
(II) I810(0): Supported additional Video Mode:
(II) I810(0): clock: 108.0 MHz   Image Size:  340 x 270 mm
(II) I810(0): h_active: 1280  h_sync: 1328  h_sync_end 1440 h_blank_end
1688 h_border: 0
(II) I810(0): v_active: 1024  v_sync: 1025  v_sync_end 1028 v_blanking:
1066 v_border: 0
(II) I810(0): Serial No: ETL5108015

This information is called EDID information. Creating a ModeLine from
this is just a matter of putting the numbers in the correct order:

ModeLine <name> <clock> <4 horiz. timings> <4 vert. timings>

Heres one I made earlier (unfortunately, not the one from the log, that
one works 'out-of-the-box')

ModeLine "1680x1050" 146.0 1680 1784 1960 2240 1050 1053 1059 1089

Cheers

Tom

[1]
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/x-config.html
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