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Old 10-25-2008, 05:03 PM   #1
Registered: Oct 2008
Posts: 190

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Display switching (notebook screen, external VGA)

I'm running kubuntu on a Toshiba M30X laptop.
I use the laptop as my main work computer, since I find it inefficient to run my full-sized Q6600 for internet browsing or web-editing - all that processing power is best left for games.

However, that means the laptop spends most of its time sitting on my desk. Since I have a 21" CRT screen sitting on the same desk, and since that has rather more viewable area than the built-in 15.4" LCD, I'd much rather use that when not on the move.

This worked flawlessly in Windows: the laptop has the fn-f5 key combination, and that selects whether to run the built-in LCD, external VGA or both.
I could select external VGA, then set the resolution as I did normally, and that resolution would become locked to the CRT - it'd go back to native 1280x800 when switching to the LCD screen, and it'g go back again to whatever I'd selected before when switched to CRT again.

I need the same thing in kubuntu now, but I don't know how to do it. Fn+f5 does nothing; I tried tinkering with the Monitor & Display settings, but only managed to get both screen to come on at the same time - I can't get one to shut down while the other stays powered up, and I can't choose between then.

Please help me solve this - aside from this problem, kubuntu is turning out to be everything I've always wanted an operating system to be.

Last edited by Changes; 10-25-2008 at 05:05 PM.
Old 11-25-2008, 07:13 PM   #2
Registered: Oct 2008
Posts: 190

Original Poster
Rep: Reputation: 16
I'm still banging my head on this.

So far I've managed to use xrandr to switch both the LCD and the CRT's resolution to 1024x768. I can't have control over them separately, and I can't set the resolution to 1280x960 as the LCD doesn't support it.

Xrandr doesn't see the external monitor. Here's what happens when I give the xrandr command:

Screen 0: minimum 320 x 200, current 1024 x 768, maximum 2560 x 800
default connected 1024x768+0+0 0mm x 0mm
2560x800 60.0
1280x800 60.0
1280x768 60.0
800x600 85.0 75.0 72.0 70.0 60.0 56.0 160.0 120.0 100.0 90.0
1024x768 60.0 85.0* 75.0 72.0 70.0 120.0 100.0 90.0
1024x480 60.0
848x480 60.0
720x576 60.0
720x480 60.0
640x480 85.0 75.0 72.0 60.0 160.0 120.0 100.0 90.0
640x400 75.0 60.0
640x350 60.0
512x384 60.0
400x300 75.0 60.0
320x240 75.0 60.0
320x200 75.0 60.0

Also, here are my xorg.conf and xorg.0.log files. As you can see from xorg.conf, the external monitor is there - it's the Belinea one - but for some reason it can't be controlled by xrandr.

Any help would be greatly appreciated
Old 11-30-2008, 02:27 PM   #3
Registered: Oct 2008
Posts: 190

Original Poster
Rep: Reputation: 16
Bump. Does nobody know?


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