[Bug 72905] New: [3.12.5] Atombios stuck in a loop

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72905

          Priority: medium
            Bug ID: 72905
          Assignee: dri-devel at lists.freedesktop.org
           Summary: [3.12.5] Atombios stuck in a loop
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: thierry.vignaud at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Radeon
           Product: DRI

I tried booting with radeon.dpm=1 with Mageia 4 beta 2 (kernel-3.12.5 &
mesa-10.0).
Gfx cards is RV670 ([Radeon HD 3690/3850], PCI ids: vendor=1002 device=9505
subv=174b subd=2542)

First xorg often results in black screen then gnome failure.
Subsequent xorgs are slow to death

dmesg is filled with:
+*ERROR* atombios stuck in loop for more than 5secs aborting
+*ERROR* atombios stuck executing CE58 (len 349, WS 0, PS 4) @ 0xCE75

or:
+*ERROR* atombios stuck in loop for more than 5secs aborting
+*ERROR* atombios stuck executing CDBE (len 153, WS 0, PS 4) @ 0xCDD4
+*ERROR* atombios stuck executing B9E2 (len 760, WS 0, PS 0) @ 0xBB6B
+*ERROR* atombios stuck executing B920 (len 138, WS 0, PS 8) @ 0xB92A

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