[Bug 39672] New: [r280] Black screen on PPC with digital monitor on radeon / Cannot find any crtc or sizes

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=39672

           Summary: [r280] Black screen on PPC with digital monitor on
                    radeon / Cannot find any crtc or sizes
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.0.0-rc6
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri at kernel-bugs.osdl.org
        ReportedBy: rechner at vlado-do.de
        Regression: No


Created an attachment (id=66132)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=66132)
syslog from system without video output

Testing Kernel 3.0.0 (rc6 from Debian experimental) I encountered a problem
with (DVI) display detection - the screen goes blank when trying to activate
KMS. From syslog:

[drm:radeon_add_legacy_connector] *ERROR* DVI: Failed to assign ddc bus! Check
dmesg for i2c errors.

[drm]   DDC: no ddc bus - possible BIOS bug - please report to
xorg-driver-ati at lists.x.org

No connectors reported connected with modes
[drm] Cannot find any crtc or sizes - going 1024x768

To me this looks quite similar to #23222.

With a VGA monitor the screen does not go blank, but I still don't get the
login window in KDM (?).

I'm using Ubuntu 11.04 and with a self-compiled 2.6.39-rc7 kernel I have
working KMS (even though direct rendering does not work, as reported on
https://bugs.freedesktop.org/show_bug.cgi?id=37169 ).

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