How to find HorizSync / VertRefresh rates?

Victor Engmark victor.engmark at
Mon Apr 30 09:02:57 UTC 2007

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

I've tried the values presented in MonitorsDB
for "Dell 1400x1050 Laptop Display Panel", which are HorizSync
31.5-90.0 and VertRefresh 59.0-75.0, but I get a warning in
/var/log/Xorg.0.log for both of them saying they are "not within DDC

I've tried looking around the Dell web pages, but I haven't found any
pages mentioning these parameters (not too surprising, really).

I've tried to leave these settings out, but even then I get a warning:
(WW) I810(0): config file hsync range 60-66.3158kHz not within DDC hsync ranges.

I'm wondering if this has anything to do with the other warnings I get
during startup:
(WW) I810(0): Bad V_BIOS checksum
(WW) I810(0): Extended BIOS function 0x5f05 failed.

It seems that a DDC (or, apparently, DDS) query should be able to
determine these numbers, but
cd /usr/ports && make search name=ddc && make search name=dds
doesn't give any tools to deal with this.

The relevant part of /etc/X11/xorg.conf:

Section "Monitor"
  Identifier   "Dell Latitude D610 monitor"
  VendorName   "SEC"
  ModelName    "3450"
  # From Xorg.0.log
  DisplaySize  286 214
  Option       "DPMS"

Victor Engmark
Quidquid latine dictum sit, altum videtur - What is said in Latin,
sounds profound

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