From: Keith Packard <keithp@keithp.com>
To: Ben Brewer <ben.brewer@codethink.co.uk>,
dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org,
linux-kernel@vger.kernel.org
Subject: Re: i915 SSC Patch
Date: Fri, 29 Jul 2011 11:45:28 -0700 [thread overview]
Message-ID: <yunwrf1gc3b.fsf@aiko.keithp.com> (raw)
In-Reply-To: <4E32ADC7.3080002@codethink.co.uk>
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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.
--
keith.packard@intel.com
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next prev parent reply other threads:[~2011-07-29 18:45 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-29 12:55 i915 SSC Patch Ben Brewer
2011-07-29 14:23 ` Paul Menzel
2011-07-29 18:45 ` Keith Packard [this message]
2011-07-29 19:02 ` Chris Wilson
2011-07-29 21:18 ` Keith Packard
2011-07-29 22:01 ` Gene Heskett
2011-07-29 22:18 ` Keith Packard
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