xorg does not detect the heads in the same order than windows on a dual-dvi PCIE X700 This is very user-unfriendly, this means on a dual boot system one of the two OSs won't display any image unless it's tweaked manually to change the primary monitor (hooking something else on the secundary head to see what's you're doing meanwhile. Most users will decide the blank system is broken instaed of hunting and fixing the problem
Created attachment 4418 [details] xorg.conf
Created attachment 4419 [details] Xorg.0.log
Created attachment 4420 [details] lspci
same problem on x700 mobile. X.org 7.1 doesn't fix it. blackscreen on starting X on first device (laptop display), picture on external monitor.
Sorry about the phenomenal bug spam, guys. Adding xorg-team@ to the QA contact so bugs don't get lost in future.
I think this is related to, or a duplicate of, bug #5473.
with ati git master you can re-arrange the heads anyway you like using xrandr.
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