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I have an ATI Radeon HD 5700 with 2 monitors.

In Windows 7 I can use both screens fine (I mean like having a single monitor).

I have also installed Kubuntu, but when I log in, the monitors are cloned.

What must I do in Kubuntu?

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This question seems abandoned, there is not further information or activity added to it for several months. I am flagging this to be closed by a moderator. If you think this issue is still affecting you you can flag a moderator to re-open it. – Bruno Pereira♦ Feb 2 '12 at 22:53

migrated from serverfault.com May 28 '11 at 13:32

closed as too localized by Marco Ceppi♦ Feb 2 '12 at 23:54

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3 Answers

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you can install ati card driver and then the ati catalyst control center will install in it under Display Manager choose multi display and you will find it there enter image description here

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I can start you on your way, although this might need some more padding from someone with an ATI card.

You'll probably need the propriety (i.e. from the manufacturer, rather than open source) drivers installed. There should be an notification looking for your attention, but I'm not sure where it appears in Kubuntu. In lieu of that you can use:

sudo jockey-text

This should get you up to speed with your drivers, if you aren't already.

For the dual monitor you may be able to use 'Monitors' in the 'Control Center' to make it dual screen (rather than cloned.) It is possible, like nvidia, that you'll have to use ATI's software, however. A quick google search has suggested you try this:

kdesu aticonfig --initial

Not being sure, however, I'd recommend you back up your video configuration first; just to be safe:

backup: sudo cp /etc/X11/xorg.conf /etc/X11/xorg.pre_ati

restore: sudo cp /etc/X11/xorg.pre_ati /etc/X11/xorg.conf

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KDE

The KDE Display and Monitor settings are: System Settings > Display and Monitor.

With the Size & Orientation module you could put the monitors/desktops side by side or on top of each other.

enter image description here

With the Multiple Monitors module you could set a single desktop spread across multiple monitors.

The older hardware can have limitations how the desktops can be positioned: http://kubuntuforums.net/forums/index.php?topic=3119450.0

Generic Ubuntu documentation

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