linux-kernel - Re: Linux 2.6.37-rc8 (no fb)

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Date:	Thu, 30 Dec 2010 23:31:27 +0000
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	Jeff Chua <jeff.chua.linux@...il.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	dri-devel@...ts.freedesktop.org, Alex Riesen <raa.lkml@...il.com>
Subject: Re: Linux 2.6.37-rc8 (no fb)

On Thu, 30 Dec 2010 10:49:33 +0800 (SGT), Jeff Chua <jeff.chua.linux@...il.com> wrote:
> 
> On Thu, Dec 30, 2010 at 4:16 AM, Jesse Barnes <jbarnes@...tuousgeek.org> 
> wrote:
> 
> > Randy, Jeff and Alex, does the below help at all?  If so, it may be the
> > minimal fix we want for 2.6.37.
> 
> Jesse,
> 
> Yes, that worked for me. I improved on the patch a bit below.
> 
> Thanks,
> Jeff
> 
> 
> --- a/drivers/gpu/drm/i915/intel_bios.c	2010-12-29 13:35:57.000000000 +0800
> +++ a/drivers/gpu/drm/i915/intel_bios.c	2010-12-30 10:18:39.000000000 +0800
> @@ -262,7 +262,10 @@
>   	if (general) {
>   		dev_priv->int_tv_support = general->int_tv_support;
>   		dev_priv->int_crt_support = general->int_crt_support;
> -		dev_priv->lvds_use_ssc = general->enable_ssc;
> +
> +		/* force disable until we can parse this correctly */
> +		dev_priv->lvds_use_ssc = (IS_GEN5(dev) || IS_GEN6(dev)) ?
> +			0 : general->enable_ssc;

This reveals another bug whereby we don't clear conflicting bits in
PCH_DREF_CONTROL set by the BIOS...
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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