[Bug 64850] New: Second screen black on Pitcairn PRO

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=64850

          Priority: medium
            Bug ID: 64850
          Assignee: dri-devel at lists.freedesktop.org
           Summary: Second screen black on Pitcairn PRO
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: flocke at shadowice.org
          Hardware: Other
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Radeon
           Product: DRI

Created attachment 79637
  --> https://bugs.freedesktop.org/attachment.cgi?id=79637&action=edit
dmesg | grep drm right after boot (no X11)

I just installed my new Pitcairn PRO card (Radeon 7850) in my PC.

Every time I boot into linux (Arch Linux x86_64) my second monitor turns black
right at boot.
There are no errors and I can even start X11 with my dual-monitor configuration
and move the mouse from my first screen to the right. It is as if the screen is
there, only my monitor doesn't show it.

This happens not in X11, in fact the secend screen goes black as soon as the
kernel/kms is loaded.

I attached the output of 'dmesg | grep drm' with the drm.debug=15 kernel option
right after booting and befor starting X11 and I will attach the same commands
output after running X11.

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