Triple fail.

[denny]

Since installing Ubuntu 9.04 I've been unable to get my three-screen set-up working again.

I can get it to run either the two screens from the PCIe card, or the single screen on the PCI card, but not all three screens at once.


Here is the xorg.conf for all three screens, and the diffs to get the two/one screen set-ups (I just remove the unwanted screens from the server layout section - everything else stays the same):

http://pastebin.com/m6304c8a


Here is the Xorg.0.log for each of the set-ups:

http://pastebin.com/m7af1b62c (2 screens, PCIe card, works)
http://pastebin.com/m177b81ab (1 screen, PCI card, works)
http://pastebin.com/m721a574c (3 screens, both cards - broken)


If anybody has any great ideas on how to fix it, I'd love to hear them.

Comments

[olithered]

The only interesting warning messages in the xlog are:
====
#
(WW) NVIDIA(2): The GPU driving screen 2 is incompatible with the rest of the
#
(WW) NVIDIA(2): GPUs composing the desktop. OpenGL rendering will be
#
(WW) NVIDIA(2): disabled on screen 2.
====

Can you turn off OpenGL completely?

Meanwhile what happens on the screen(s) during/after the failure?

[denny]

I had that error when it was working on Ubuntu 8.04 so I'm not tooooo worried about it.

X won't start with the 'all three' config - it flicks the screen a few times, then falls back to the command-line 'zomg it all be broked' warning.

[olithered]

I had to add the following to my config in order to work with dual-head:
====
Section "ServerFlags"
Option "AutoAddDevices" "false"
Option "AutoEnableDevices" "false"
EndSection
====

Should be ok to try since you're explicitly defining the input devices.

[denny]

I'll give that a go when I get home - cheers!

[olithered]

Possibly related:
http://ubuntuforums.org/showthread.php?t=1102793
http://ubuntuforums.org/showthread.php?p=6810460

how about this?

[olithered]

http://pastebin.com/pastebin.php?diff=m4872a11d

Re: how about this?

[denny]

Nope :) Although I did expect it to be, when I first created a three-screen set-up. The screen numbers in that section are per card though, not per X.

[hythloday]

Couple of things I can think of:

* re-run lspci to check your BusIDs, occasionally kernel upgrades can change the PCI enumeration algorithm and these can change.

* try and get 2-monitor support working on 2 different graphics cards.

[reddragdiva]

Hah! Multicard officially no longer works in X.Org! It will be fixed when Xrandr supports it. Which will be when someone writes the code.

No, really. Read the xorg@ list. They really let that rot.

[denny]

Holy shit, really? Fuckers!

I don't think my PCIe bus is fast enough to run a quad-port card, it's one of the oldest motherboards to have PCIe at all. Also I can't get the second mortgage required to buy a quad-port card. Shit!

[olithered]

Two screens (two servers) with two cards works for me, though the cards are the same (nv 6600 like you).

The xorg bug seems to suggest that sometimes things will be ok with identical hardware so a cheaper option may be to add a second hand 6600 - unless the limitation is just related to a single server.

Meanwhile I also found this on LP:
https://bugs.launchpad.net/ubuntu/jaunty/+source/xorg-server/+bug/267241