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I have laptop HP Compaq 610 on Intel, and I want to add an additional monitor. I would like this monitor to be a second desktop and not a part of the current desktop, because my laptop resolution is 16:9 and monitor is 16:10

Any ideas how this can be achieved?

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You're looking for MultiseatX. It's documented here.

It's a little dated and doesn't include LightDM. It does have directions for KDM and workarounds for GDM.

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You should note that this uses GDM (as was the fashion at the time) and hasn't been updated to LightDM. – Oli Mar 21 '12 at 12:55
But will it work under ubuntu 11.04 ?? – skowron-line Mar 21 '12 at 14:46
It would appear someone got it working on 11.04 using kdm – RobotHumans Mar 21 '12 at 15:02

I use the command line utility Disper (there's a PPA, add it with sudo apt-add-repository ppa:disper-dev/ppa && sudo apt-get update, install sudo apt-get install disper) from the alt-F2 dialog box, disper -e will set your desktop to 'Extend mode' and disper -c will clone (mirror) again. disper -s to use only the standard display or disper -S to use the secondary display.

EDIT: changed -m (mirror) to -c (clone)

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after disper -e i get There is no matching crtc for the output , after disper -m was Usage: disper [options] (-l|-s|-c|-e|-p|-i), disper -s switched off secound monitor, adn disper -S switched on secound monitor. So this doesnt work like I want – skowron-line Mar 22 '12 at 10:50
OK, I may have got the letters wrong - do man disper or disper -h to figure it out? – Andrew Mar 22 '12 at 12:21
Dont work for me. Any letter – skowron-line Mar 23 '12 at 10:09
so disper -e doesn't extend, just gives errors? it's supposed to… you should report the bug to the disper development team, on launchpad – Andrew Mar 25 '12 at 0:26
I was having problems with disper on 15.10 wily so I deleted .config/monitors.xml. That didn't fix the problem so I ran "disper -s" and "disper -e" a couple more times and then it worked. – Bob Feb 19 at 22:48

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