Thanks Scott.
read-edid does not seem to exist on my system.
And I don't think xrandr is what I need. It seems to report your current settings and allow you to change things.
As you can see from this output, I've got two monitors connected in xinerama mode (thus the 2800 x 1050 resolution) but there is no indication from the output about the second monitor.
# xrandr -q SZ: Pixels Physical Refresh *0 2800 x 1050 ( 757mm x 303mm ) *60 1 1400 x 1050 ( 757mm x 303mm ) 60 2 1280 x 1024 ( 757mm x 303mm ) 60 47 43 3 1152 x 864 ( 757mm x 303mm ) 60 47 43 ...
What I'm trying to do is have the laptop detect when a second monitor is connected during boot and automatically put the system into xinerama mode. When no monitor is detected it should default to clone mode.
Currently this is strictly a manual process for me now during boot but its a bit of a pain.
From playing around with MythTV I know the video card has the ability to
detect what devices are connected. I just need to figure out the command line way of getting this information.
Regards,
John
On Wed, 2007-07-11 at 13:05 -0500, Scott Balneaves wrote:
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?
If you're looking for the low level bit, I think read-edid is what you're looking for.
However, if you're on a modern xorg based distro, xrandr is a good one:
oin$ xrandr -q SZ: Pixels Physical Refresh *0 1280 x 1024 ( 342mm x 271mm ) *75 60 1 1024 x 768 ( 342mm x 271mm ) 75 70 60 2 832 x 624 ( 342mm x 271mm ) 75 3 800 x 600 ( 342mm x 271mm ) 75 72 60 56 4 640 x 480 ( 342mm x 271mm ) 75 73 60 5 1280 x 960 ( 342mm x 271mm ) 60 6 1280 x 800 ( 342mm x 271mm ) 60 7 1152 x 864 ( 342mm x 271mm ) 75 8 1280 x 768 ( 342mm x 271mm ) 60 9 1152 x 768 ( 342mm x 271mm ) 55 10 416 x 312 ( 342mm x 271mm ) 75 11 400 x 300 ( 342mm x 271mm ) 75 72 60 Current rotation - normal Current reflection - none Rotations possible - normal Reflections possible - none
xrandr will allow you to do all sorts of cool things. If it's an intel chipset, you can switch monitors, etc etc etc.
Scott