Re: i915 SSC Patch

On Fri, 29 Jul 2011 13:55:35 +0100, Ben Brewer ben.brewer@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.