[Bug 98046] iMac11,1 (RV770/M98L [Mobility Radeon HD 4850]) needs nomodeset to boot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98046

James Cameron <quozl at laptop.org> changed:

           What    |Removed                     |Added
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                 CC|                            |quozl at laptop.org

--- Comment #3 from James Cameron <quozl at laptop.org> ---
Created attachment 130894
  --> https://bugs.freedesktop.org/attachment.cgi?id=130894&action=edit
dmesg of first failed commit

Same with another iMac11,1, but no firmware update.  Kernels before 3.14 are
fine.  Kernels from 3.14 show blank display or sometimes flickering horizontal
lines.

I've done a git bisect and first failing commit is
32167016076f714f0e35e287fbead7de0f1fb179 "drm/radeon: rework finding display
PLL numbers v2" by Christian König.

Happy to test kernels or enable debugging, let me know.

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