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I have 2 external monitors connected to a docking-station for the above mentioned laptop. Both monitors are identical Dell 1280x1024, one is connected to the DVI connector, the other to the VGA connector (and routed through a KVM switch).
I've mastered enough xrandr-fu to get the first monitor and the laptop display to work together with either being primary. Here's the `xrandr` output:
Code:
# xrandr
Screen 0: minimum 320 x 200, current 2880 x 1024, maximum 8192 x 8192
LVDS1 connected 1600x900+1280+0 (normal left inverted right x axis y axis) 310mm x 174mm
1600x900 60.0*+
1024x768 60.0
800x600 60.3 56.2
640x480 59.9
VGA1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
HDMI3 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 376mm x 301mm
1280x1024 60.0*+ 75.0
1152x864 75.0
1024x768 75.1 60.0
800x600 75.0 60.3
640x480 75.0 60.0
720x400 70.1
DP2 disconnected (normal left inverted right x axis y axis)
DP3 disconnected (normal left inverted right x axis y axis)
What I want is the laptop screen (LVDS1) to be off, and the 2 external monitors active. I can't figure out which output to use, or how to turn it on. Hate to say this, but this works fine in Windows 7.
Yes, that is half of the solution -- turning off the laptop screen. What eludes me is getting the second external monitor activated. That is: "xrandr --output [VGA1|HDMI1|DP1|HDMI2|DP2|DP3] --right-of HDMI3" does nothing for me.
This turns off my laptop screen, and activates the first external monitor. I can't get the second external monitor to do anything. I can add a third "--output" clause with any of the other recognized, but "disconnected", displays to no effect.
I think the problem is that X is not seeing the second external display.
If I swap it back through the KVM, the second display is black, but I can move the mouse there, and can get parts of windows to drag there, but it's not usable. Weird.
EDIT: Marking this thread as solved -- I'll search for a solution to recognizing a monitor through a cheapo KVM as a separate problem.
Last edited by kfritz; 02-28-2013 at 10:30 AM.
Reason: Marking as solved...
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