You are missing screen number in server layout:
Section "ServerLayout"
Identifier "aticonfig Layout"
Screen 0 "aticonfig-Screen[0]-0" 0 0
Screen 1 "aticonfig-Screen[0]-1" RightOf "aticonfig-Screen[0]-0"
EndSection
And maybe add Screen 0 to first device too:
Section "Device"
Identifier "aticonfig-Device[0]-0"
Driver "fglrx"
BusID "PCI:1:0:0"
Screen 0
EndSection
You are unable to reproduce because you are NOT using two screens. Your
second screen is deleted (error line you provided). So I think you are
using just two monitors as one screen.
Both bugs are still in saucy. I have 3 screens - two with white
background. And compiz does not handle two or more screens anymore.
Workaround is to start one instance per screen.
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https://bugs.launchpad.net/bugs/885989
Title:
white screen on second monitor when using two xsessions
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