[Bug 54471] New: one of three monitors will not light up post-kms on radeon 5770

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=54471

             Bug #: 54471
           Summary: one of three monitors will not light up post-kms on
                    radeon 5770
    Classification: Unclassified
           Product: xorg
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: gsomlo at gmail.com
         QAContact: xorg-team at lists.x.org


Created attachment 66584
  --> https://bugs.freedesktop.org/attachment.cgi?id=66584
dmesg output

I have the MacPro5,1 version of Radeon 5770 (see
http://www.amazon.com/gp/product/B003Z6QH6M), and have three Dell U2412M
monitors connected to it (two via miniDP-to-DP cables, the third one using the
DVI cable included with the monitor).

X11 sees all three monitors (DisplayPort-0, DisplayPort-1, and DVI-0), but
immediately after KMS during boot, DisplayPort-1 goes into powersave and cannot
be "woken up". DisplayPort1 is the first screen that "lights up" when the
machine is powered on. Once grub kicks in, both DisplayPort-0 and DisplayPort-1
are mirrored, with DVI-0 being off. After KMS, DVI-0 lights up, and
DisplayPort-1 goes to sleep.

Tinkering with the Gnome display settings and/or xrandr will sometimes wake up
DisplayPort-1, but always at the expense of turning off either DisplayPort-0 or
DVI-0 instead. I could never get all three of them to light up under Linux.

I'm using up-to-date stock F16 (3.4.9-2.fc16.x86_64), but have also tried
3.6-rc4 with the same results.

I'm attaching my dmesg output and Xorg.0.log.

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