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Old 05-27-2012, 04:20 PM   #1
rawrFox
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Registered: May 2011
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Triple display setup help, Radeon HD 3450 + Cirrus Logic GD 5446


Hi,

I'm trying to set up a triple monitor display, but can't seem to figure out what to do next. The three monitors work as a single stretched desktop in Windows XP with little setup configuration, so I expected to boot into Slackware (KDE) and it would just work. But it doesn't.

Here is the relevant output of 'lspci':
Code:
01:05.0 VGA compatible controller: Cirrus Logic GD 5446
02:00.0 VGA compatible controller: ATI Technologies Inc RV620 LE [Radeon HD 3450]
By default the two 'radeon monitors' come up, and I can configure them to work perfectly. In the BIOS, if I set the PCI-E as the 'Primary display', Slackware shows the desktop on the cirrus monitor only.

In both cases, xrandr shows only the monitors currently displaying.

My question is: What steps should I take now to try and enable a triple monitor setup?

Thanks,
rawrFox

EDIT: I just realised that if I have the PCI output setup as the default output in the BIOS, the Linux system boots up with all 3 screens. The X display appears on the PCI output, and and the other two monitors show console login prompts. Interestingly, if I login on the console and enter 'startx', it starts a new X server on a new virtual console. I can access these via CTRL+ALT+(anything above 7); below 7 it switches to the console on the other two monitors. Whats going on?!?!?!

Last edited by rawrFox; 05-27-2012 at 07:09 PM.
 
Old 05-30-2012, 02:31 AM   #2
Nominal Animal
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Quote:
Originally Posted by rawrFox View Post
The X display appears on the PCI output, and and the other two monitors show console login prompts. Interestingly, if I login on the console and enter 'startx', it starts a new X server on a new virtual console. I can access these via CTRL+ALT+(anything above 7); below 7 it switches to the console on the other two monitors. Whats going on?!?!?!
You just haven't told the X server you want to use more than one graphics card.

You need to reconfigure your X server. Try running xorgsetup to see if it lets you enable all your graphics cards (instead of just the default one). If not, then you'll need to write the configuration file /etc/X11/xorg.conf yourself. It's not that complicated, but xorgsetup would be easier if it works. The slackware forum here should be able to help you with it either way.
 
Old 06-05-2012, 10:38 PM   #3
rawrFox
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Registered: May 2011
Location: Knapford, Sodor
Distribution: Slackware, FreeBSD
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Original Poster
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Hi,

Thanks for your reply.

I've tried xorgsetup and 'X --configure', and then just playing around with the xorg.conf using information I can find about it. The best result I've gotten is an error message stating that there isn't enough video memory in the Cirrus card for the specified resolution. I guess the card is just too old for the purposes I want.

rawrFox.
 
  


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