[Bug 43801] New: With dual "Cedar pro" cards (ATI 5450) corruption on second output of second card

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=43801

             Bug #: 43801
           Summary: With dual "Cedar pro" cards (ATI 5450) corruption on
                    second output of second card
    Classification: Unclassified
           Product: xorg
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: FreeBSD
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: dlacroix+xorg at gmail.com
         QAContact: xorg-team at lists.x.org


Created attachment 54399
  --> https://bugs.freedesktop.org/attachment.cgi?id=54399
xorg.conf Xorg.0.log pciconf -v output

This is with FreeBSD 8.2 Release, git version of the xf86-video-ati drivers as
well as 6.14.2 and 6.14.3 versions of the driver. 

Setup:
  Dell 990 with 2 PCIE slots.    First card in "blue" x16 slot.   Second card
in "black" x16 length slot ... As I understand, this slot is only wired for x4.

OS: FreeBSD 8.2 Release  -- GENERIC kernel

Screen 0 is on 1st card
Screen 1 is on 2nd card

after X is started, use xrandr to "expand" onto the second monitor of each pair
using a command like this:
  xrandr -display :0.1 --output DVI-0 --primary --output DVI-1 --right-of DVI0
  xrandr -display :0.0 --output DVI-0 --primary --output DVI-1 --right-of DVI0

Display :0.0   is now spanned across the two monitors connected to the first
card.

Display :0.1   is the 2 monitors connected to the second card.    First screen
looks normal.   Second screen appears to be an offset mirror of first screen
with corruption along one side.   (where the corruption appears depends on what
resolution is brought up).

Have tried swapping monitors, split-out cables, swapping cards between the 2
slots, corruption always occurs on the second display connected to the second
card.

If I reduce to only one card, I can always get 2 displays to work as expected. 
Corruption only occurs on card in the second slot of the machine when both
cards are installed.

I have 5 boxes with this same configuration.  All show same symptom.

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