From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 24462] r600: spread spectrum: flickering screen (bisected)
Date: Wed, 8 Dec 2010 21:14:52 GMT
Message-ID: <201012082114.oB8LEqZ0020049@demeter1.kernel.org>
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https://bugzilla.kernel.org/show_bug.cgi?id=24462
--- Comment #5 from Alex Deucher 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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