[Bug 91197] Radeon Trinity 7400G fails with 4K UHD screen - atombios stuck exeuting BF64

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=91197

            Bug ID: 91197
           Summary: Radeon Trinity 7400G fails with 4K UHD screen -
                    atombios stuck exeuting BF64
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: dennis.jansen@web.de

I have several issues trying to connect a 4k display to the radeon card via
HDMI (@30Hz). If I boot with the screen connected, when trying to take over
modesetting from EFI, the internal notebook display goes black as well as the
external.

When I try to attach it during runtime, I can see the 3840 mode, but when I
tryt to select it I get 
[   97.667521] [drm:atom_op_jump [radeon]] *ERROR* atombios stuck in loop for
more than 5secs aborting
[   97.667549] [drm:atom_execute_table_locked [radeon]] *ERROR* atombios stuck
executing BF64 (len 962, WS 0, PS 0) @ 0xC1A1

Switching back to 1920 works fine, trying again simply causes the same error
again. Tested Linux kernels 4.1.0 and 3.19. Ubuntu 15.04.

I might not be able to test for long, will probably send the screen back before
long if I can't get it working in full resolution at all.

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