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Old 10-12-2005, 01:12 AM   #1
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Monitor frequency detection

Does anyone know a way to detect a monitor's horizontal and/or vertical sync frequency in Linux? I am trying to put together a livecd and I intend to use X server on it. If there are differences between XFree86 and Xorg, I would like to know. Can anyone of them autodetect the frequencies of the monitor?
Old 10-13-2005, 12:28 AM   #2
Wim Sturkenboom
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Old 10-13-2005, 01:23 AM   #3
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Plug-and-play monitors use EDID to report information about their capabilities. You can use read-edid to get that information as follows:
get-edid | parse-edid
This must be done as root. Note that running this can make things unstable if either of your video card or monitor don't truly support edid.

X can normally autodetect your acceptable ranges using EDID data unless you disable it with
Option  "NoDDC"
in the Device section.
Old 10-13-2005, 01:42 AM   #4
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There is no 100% way of detecting these values (otherwise distros would be using it). You might want to have a look at how Knoppix does it (I think it uses EDID) but I'm not so sure. Also, Knoppix is easily customizable and you can make your own Live CD using Knoppix as your base, which would save you a lot of unnecessary effort.
Old 10-14-2005, 12:37 AM   #5
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Thank you all, I'm digging in these directions.


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