i915 SSC Patch

[Keith Packard]

On Fri, 29 Jul 2011 13:55:35 +0100, Ben Brewer <ben.brewer at codethink.co.uk> wrote:

> I've added a global SSC (Spread Spectrum Clock) parameter to the i915 
> driver, since having SSC enabled breaks (distorts) VGA output on some 
> Core i5/i7 chips (see https://bugs.freedesktop.org/show_bug.cgi?id=38750).
> SSC is still enabled by default so the behaviour won't change but 
> setting the global_use_ssc parameter will turn this feature off and 
> allow affected devices to function correctly (notably the Dell Vostro
> 3300).

The question I have is why is SSC enabled on the VGA output at all? I
don't see any way VGA could ever tolerate it.

-- 
keith.packard at intel.com
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