[Bug 70391] New: "atombios stuck executing D1FC" when switching back from tty to X

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70391

          Priority: medium
            Bug ID: 70391
          Assignee: dri-devel at lists.freedesktop.org
           Summary: "atombios stuck executing D1FC" when switching back
                    from tty to X
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: lbdkmjdf at sharklasers.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Radeon
           Product: DRI

Created attachment 87489
  --> https://bugs.freedesktop.org/attachment.cgi?id=87489&action=edit
dmesg

Sometimes, I get this error message repeatedly:
[drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting
[drm:atom_execute_table_locked] *ERROR* atombios stuck executing D1FC (len 62,
WS 0, PS 0) @ 0xD218
and the screen gets stuck. (last time it happened, the screen recovered by
itself). The keyboard won't respond, but I can't power off the machine by
pressing the power button.

attached: dmesg, Xorg logs, video BIOS dump

$ lspci -vnn | grep VGA
00:01.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] BeaverCreek [Radeon HD 6520G] [1002:9647] (prog-if 00 [VGA
controller])
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] Whistler [Radeon HD 6630M/6650M/6750M/7670M/7690M] [1002:6741] (rev
ff) (prog-if ff)
(second card was disabled through vgaswitcheroo)

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