help with multihead setup in xorg with radeon

[jrch2k8]

hi guyz, i have a radeon 4850x2 ehich have 4 dvi connectors, is possible to use 1 monitor per GPU (both same rez) without xinerama?

[droidhacker]

Xinerama wouldn't come into play when two monitors are on two GPUs. You'll have 1 xserver running per GPU.

[jrch2k8]

mmm ok, i had that idea too, let me try to force kdm to initialize both xservers

[monraaf]

You don't need to run two xservers for that, you can just run one xserver with 2 separate screens.

[droidhacker]

You don't need to run two xservers for that, you can just run one xserver with 2 separate screens.

TWO GPUs!!!!

[monraaf]

Yes no problem. I'm using two different GPUs with one xserver myself, works fine.

$ glxinfo 2>/dev/null|grep renderer
OpenGL renderer string: Mesa DRI R600 (JUNIPER 68BE) 20090101  TCL DRI2
OpenGL renderer string: Mesa DRI R600 (RS780 9610) 20090101  TCL DRI2

[droidhacker]

Right... count the number of Xorg processes you have running.

[monraaf]

Don't be stubborn. Like I said I have only one xserver running with two separate screens.

[jrch2k8]

Yes no problem. I'm using two different GPUs with one xserver myself, works fine.

$ glxinfo 2>/dev/null|grep renderer
OpenGL renderer string: Mesa DRI R600 (JUNIPER 68BE) 20090101  TCL DRI2
OpenGL renderer string: Mesa DRI R600 (RS780 9610) 20090101  TCL DRI2

nice, can you explain me how to try that configuration? i tried many methods but i couldn't get it like that

plz

[rohcQaH]

I think what monraaf did was to create two Device and Screen sections in his xorg.conf, then join them with Xinerama.

If you want a big desktop with the ability to drag windows between screens, you need Xinerama if you have multiple GPUs.

You could also configure both as a single X server without Xinerama, using a single mouse/keyboard, but without the ability to drag windows across screen boundaries.

The third option is to configure two separate X servers, needing a separate mouse/keyboard for each and some multiseat hackery so they don't fight over the active VT.


You could forfeit one GPU and attach both monitors to the other; then you'd have a big desktop without Xinerama. For 2d and compositing that would probably be faster. Not for heavy 3d-apps (games) though.