linux-kernel - Re: i915 SSC Patch

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Message-ID: <yunwrf1gc3b.fsf@aiko.keithp.com>
Date:	Fri, 29 Jul 2011 11:45:28 -0700
From:	Keith Packard <keithp@...thp.com>
To:	Ben Brewer <ben.brewer@...ethink.co.uk>,
	dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: Re: i915 SSC Patch

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

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