[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

--- Comment #4 from James Cameron <quozl at laptop.org> ---
Tested 4.11.0-rc7 as-is, and drm.debug=0xe, display was flickering horizontal
lines, and got PLL setup of;

[drm:radeon_compute_pll_avivo [radeon]] 360000 - 366660, pll dividers - fb:
22.0 ref: 2, post 3

Tested 4.11.0-rc7 by reverting all the PLL changes (overkill);

72edd83cc9e58 ("drm/radeon: fix PLLs on RS880 and older v2")
4b21ce1b4b5d2 ("drm/radeon: lower the ref * post PLL maximum once more")
3b333c55485f ("drm/radeon: avoid high jitter with small frac divs")
c2fb3094669a ("drm/radeon: improve PLL limit handling in post div calculation")
24315814239a ("drm/radeon: use fixed PPL ref divider if needed")
f8a2645ecede ("drm/radeon: improve PLL params if we don't match exactly v2")
32167016076f ("drm/radeon: rework finding display PLL numbers v2")

display was good, and got PLL setup of;

[drm:radeon_compute_pll_avivo [radeon]] 36000, pll dividers - fb: 54.0 ref: 5,
post 3

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