linux-kernel - Re: i915 SSC Patch

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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

Content of type "application/pgp-signature" skipped