[Bug 24462] r600: spread spectrum: flickering screen (bisected)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=24462





--- Comment #5 from Alex Deucher <alexdeucher at gmail.com>  2010-12-08 21:14:47 ---
Created an attachment (id=39362)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=39362)
possible fix

(In reply to comment #2)
> but 2.6.36 uses ENABLE_SPREAD_SPECTRUM_ON_PPLL_PS_ALLOCATION, while the newer
> kernel uses ENABLE_LVDS_SS_PARAMETERS_V2 for the parameters (the only
> difference is that the latter does not have ucPpll); is this correct?

That is correct.  I suspect it's the pll that's problematic:
if (ss_enabled) {
        if (ss->refdiv) {
                pll->flags |= RADEON_PLL_USE_REF_DIV;
                pll->reference_div = ss->refdiv;
        }
}

It uses a fixed reference divider of 2 in your case.  Does the attached patch
help?  Please also try this patch in conjunction with the patch in comment 1.

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