To answer my own question from a while back:
The command is dccprobe.
So something like:
dccprobe |grep "analog signal"
Will tell you if you have a second monitor attached.
For debian/ubuntu (and I assume Fedora) fans, there is some good information here:
http://ubuntufan.wordpress.com/2006/10/06/detecting-dual-displays/
I put the (modified) script from that page in:
/etc/init.d/boot.local
And it works like a charm!
But SUSE does not include dccprobe so you will have to find dccprobe source and compile it yourself. I actually just used the source from the debian package (because I couldn't find it any place else):
http://packages.debian.org/unstable/source/xresprobe
Just untar, cd dccprobe, make. Then copy ddcprobe to someplace useful like /usr/local/sbin/
Now when I boot my laptop it automatically goes into either Xinerama mode, or clone dual-head mode depending on if I have another monitor attached or not.
I also have two small scripts that I can use to force it one way or the other if I plug in a monitor after booting.
John
On Wed, 2007-07-11 at 12:21 -0500, John Lange wrote:
I know someone mentioned this at a distant past MUUG meeting; what is the command line tool that will query the attached monitor for its settings? I believe this is called DDC?
I have a laptop and I'd like to have a command line tool that can detect if a second monitor is attached.
Any tips?
John
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