How to find HorizSync / VertRefresh rates?

[Greg 'groggy' Lehey]

On Monday, 30 April 2007 at 11:02:54 +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.
>
> I've tried the values presented in MonitorsDB
> <http://sources.gentoo.org/viewcvs.py/gentoo/src/hwdata/MonitorsDB?view=markup>
> 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
> ranges."
>
> 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
> and
> (WW) I810(0): Extended BIOS function 0x5f05 failed.

This, along with the follow-ups, reminds me of a problem I had with a
Dell Inspiron 5100 some years ago.  In that case, X didn't map the
video BIOS correctly, and so it wasn't able to read the information
from the BIOS.  The information includes things like the panel
geometry, which in my case was being reported as 65535x65535 pixels.
In your case we have:

>  # From Xorg.0.log
>  DisplaySize  286 214

That's clearly wrong too.  See
http://www.lemis.com/grog/diary-jul2003.html#25 for more details.
It's worth mentioning that the problem was fixed in a later version of
the system, and I can now install X on it with no problems.

If this looks familiar, a couple  of suggestions:

1: Try XFree86.  Maybe that will work better.
2: Get hold of the latest Knoppix CD and see if that works.  If it
   does, it might help fix the problem under FreeBSD.
3: Use the method I described in my diary to build a server with a
   static version of the video BIOS.

The real answer, of course, is to understand why the mapping doesn't
work (if, indeed, that's the problem).  But this could be a start.

Greg
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