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So I had Crossfire running on 14.04, but I decided to update to 15.04 and now it's acting strange. I've gone through the typical steps of commenting out everything in /etc/init/gpu-manager.conf, and I've ran through the process of executing:

sudo aticonfig --initial -f
sudo aticonfig --adapter=0,1 --cfa
sudo aticonfig --adapter=0,1 --crossfire=on

multiple times and each time the Crossfire bridge shows up when I run:

aticonfig --lsch

However, any time lightdm restarts, either during a reboot or restarting lightdm manually, running aticonfig --lsch again returns No Multiple GPU chains defined.

I've even gone so far as to replace /bin/gpu-manager but even then the problem persists. The issue also doesn't appear to be with the /etc/X11/xorg.conf file because it doesn't get overwritten anymore.

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Double check that IOMMU is not enabled.(in bios) When IOMMU is enabled,after reboot enabled amd crossfire will be disabled. And kernel will give you message: to enable crossfire ,please disable IOMMU.. 

lspci | grep IOMMU   #output must be noting

IOMMU can be switched off in bios ,or with passing iommu=off to kernel.

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