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f33e652
(Get the code!)
From the lspci output, note the two video devices are identical types:
00:00.0 Host bridge: Intel Corporation 82X38/X48 Express DRAM Controller (rev 01)
Subsystem: ASUSTeK Computer Inc. Device 8295
01:00.0 VGA compatible controller: ATI Technologies Inc R600 [Radeon HD 2900 Series]
Subsystem: ATI Technologies Inc Device 2552
02:00.0 VGA compatible controller: ATI Technologies Inc R600 [Radeon HD 2900 Series]
Subsystem: ATI Technologies Inc Device 2552
From my reading of the source, X will still abort even if the devices are not the same; it's just checking if one is marked primary or not. However, for testing purposes we should make sure the case of two identical video cards works properly. (I don't have hardware on hand that can replicate this scenario unfortunately.)