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mayhew
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Joined: 25 Feb 2013
Posts: 68

PostPosted: Tue Aug 25, 2015 2:16 pm    Post subject: dual monitor w/ single desktop Reply with quote

I have 2 displays on 1 card. i can get them both active w/window managers, or get one active w/window manager with the other detected

I want to explore initializing displays manualy or using a seperate display as a video output device. X but no Wm, enough to have it refferenceable via DISPLAY=:N.n

Im sure there must be a way to CLI a display active and to activeate a seccond Xserver without your first shutting off. (when i "X :1" from :0 , :0 turns off and :1 activates)

thank you for reading, and any assistance :)

xrandr output when 1 is active(w/wm) and other is not
Code:
~ $ xrandr
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 8192 x 8192
DVI-I-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 1600mm x 900mm
   1920x1080     60.00*+
   1680x1050     59.95 
   1440x900      59.89 
   1280x1024     60.02 
   1280x960      60.00 
   1280x800      74.93    59.81 
   1280x768      59.87 
   1280x720      60.00 
   1024x768      75.03    70.07    60.00 
   800x600       75.00    60.32    56.25 
   640x480       59.94 
DVI-I-1 disconnected (normal left inverted right x axis y axis)
TV-0 disconnected (normal left inverted right x axis y axis)
DVI-I-2 disconnected (normal left inverted right x axis y axis)
DVI-I-3 connected (normal left inverted right x axis y axis)
   1600x900      59.95 +
   1280x1024     75.02    60.02 
   1280x960      60.00 
   1280x800      59.81 
   1280x720      60.00 
   1152x864      75.00 
   1024x768      75.03    70.07    60.00 
   800x600       75.00    72.19    60.32    56.25 
   640x480       75.00    72.81    59.94

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Roman_Gruber
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Joined: 03 Oct 2006
Posts: 3806
Location: Austro Bavaria

PostPosted: Tue Aug 25, 2015 2:29 pm    Post subject: Reply with quote

For example for nvidia I think the feature was called twinview and works only with the nivdia-binary blob.

So you may tell us which gpu you utilize and which gpu implementation. So the next guy reading your topic can answer your question..
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mayhew
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Joined: 25 Feb 2013
Posts: 68

PostPosted: Tue Aug 25, 2015 2:43 pm    Post subject: Reply with quote

GPU = Nvidia [01:00.0 VGA compatible controller: NVIDIA Corporation G92 [GeForce 8800 GT] (rev a2)]
Driver = Nvidia proprietary 340.76

also somthing i can do which suggests my plan would work is, when both are active
Code:
 DISPLAY=:0.1 xrandr --output DVI-I-3 --off

disables the seccond display
Code:
 DISPLAY=:0.1 xrandr --output DVI-I-3 --auto

causes the seccond display to return

I have already gotten twinview and xinerama working and though nice its not what im looking for. i want x controll limited to one display and to controll what happens on the second display via cli

limited x controll is easily achieved when using absolute layout mode and the virtual displays are not positioned side by side, but still runs wm on display :0.1
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