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':
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?!?!?!

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.

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.