I have 2 GPU (Nvidia G96GL Quadro FX 580) hooked to 2 monitors each, and while I was on 12.04 I was happily using all 4 monitors using the proprietary drivers.
I recently upgraded to 13.10 and all hell broke loose.
- using proprietary drivers, the most I can get is 2 monitors under TwinView
- the moment I enable Xinerama and separate X-screens, I end up with a black screen on restart. No amount of tinkering with xorg.conf has been able to get me any further.
- I reverted to Noueaou, and I am happily able to use 3 monitors now. Any 3 but never 4 at a time, as the fourth one, although detected, is always disabled.
If I try to enable the 4th monitor, I get two popups with the following messages:
"The selected configuration for displays could not be applied", "could not set the configuration for CRTC 64", "Failed to apply configuration: %s", "GDBus.Error:org.gtk.GDBus.UnmappedGError.Quark._gnome_2drr_2derror_2dquark.Code2: could not set the configuration for CRTC 64"
That's where I am stuck after a week. Tried all sorts of proprietary drivers, all sorts of instructions etc but I feel the only way to get back my 4th monitor is to downgrade to 12.04 and hope 14.04 doesn't mess up things. Anyone to help?