force one screen to two monitors (for presentations)

oxygen_wobble · 2014-10-30 19:34:18

Hi everybody,

so, i usually use an additional screen for my laptop, with two individual screens ...

But, for presentations, i'd like to have the same screen on both monitors ... is there a way to force this on the fly ?

If i start x with two monitors attached, i get the usual multiscreen setup.

if i start with a single monitor (the internal LCD) and attach the external one AFTER starting x, sometimes it shows the same screen,
but today, i held a presentation, and it didn't work (the external monitor just stayed blank), so i had to turn my back on the audience way to often ...

Furthermore, i'm not using a desktop environment, just x and awesome ...

Regards,
n

runical · 2014-10-30 19:39:22

You can use xrandr to change the layout (presuming awesome is able to deal with that). If you want to save the configurations, I can recommend xrandr-mgr in the AUR.

If you use nvidia, there is also a graphical tool to set this up (does not work well with xrandr).

Last edited by runical (2014-10-30 19:40:20)

oxygen_wobble · 2014-10-30 19:44:32

Well, i know xrandr, but when i run xrandr --auto, will it do the trick ?

There are lots of options to place the screens apart from each other, but not the other way round, so it seems ...

olive · 2014-10-30 20:04:55

oxygen_wobble wrote:

Well, i know xrandr, but when i run xrandr --auto, will it do the trick ?
There are lots of options to place the screens apart from each other, but not the other way round, so it seems ...

I thinlk something like:

xrandr --output VGA1 --auto --output VGA2 --auto --same-as VGA1

Now if the two monitors does not have the same default resolution you might need to replace --auto by --mode xxxx for some mode supported by the two monitors.

Last edited by olive (2014-10-30 20:17:54)

runical · 2014-10-30 20:14:48

You can also install arandr. It gives a GUI. You should be able to set that up correctly.

Arch Linux

#1 2014-10-30 19:34:18

force one screen to two monitors (for presentations)

#2 2014-10-30 19:39:22

Re: force one screen to two monitors (for presentations)

#3 2014-10-30 19:44:32

Re: force one screen to two monitors (for presentations)

#4 2014-10-30 20:04:55

Re: force one screen to two monitors (for presentations)

#5 2014-10-30 20:14:48

Re: force one screen to two monitors (for presentations)

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