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

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Message-Id: <20101229141253.5ff91e3e.randy.dunlap@oracle.com>
Date:	Wed, 29 Dec 2010 14:12:53 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	dri-devel@...ts.freedesktop.org,
	Jeff Chua <jeff.chua.linux@...il.com>,
	Alex Riesen <raa.lkml@...il.com>
Subject: Re: Linux 2.6.37-rc8 (no fb)

On Wed, 29 Dec 2010 12:16:01 -0800 Jesse Barnes wrote:

> On Wed, 29 Dec 2010 11:40:04 -0800
> Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> 
> > On Wed, Dec 29, 2010 at 10:21 AM, Randy Dunlap <randy.dunlap@...cle.com> wrote:
> > >
> > > The only significant difference that I can see in the kernel message log
> > > is this:
> > 
> > Hmm. I suspect that difference should have gone away with commit
> > 92971021c6328 (Revert "drm: Don't try and disable an encoder that was
> > never enabled"), but clearly that didn't fix your blank screen.
> > 
> > Does reverting commit 448f53a1ede54eb854d036abf54573281412d650
> > ("drm/i915/bios: Reverse order of 100/120 Mhz SSC clocks") fix it for
> > you? It does for some people..
> > 
> > Chris - why did that lvds_ssc_freq thing suddenly start mattering? Can
> > we please just disable spread-spectrum entirely? Or perhaps only if we
> > notice that it was enabled already? Or something?
> 
> Randy, Jeff and Alex, does the below help at all?  If so, it may be the
> minimal fix we want for 2.6.37.
> 
> diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios
> index 2b20786..d27d016 100644
> --- a/drivers/gpu/drm/i915/intel_bios.c
> +++ b/drivers/gpu/drm/i915/intel_bios.c
> @@ -263,6 +263,9 @@ parse_general_features(struct drm_i915_private *dev_priv,
>                 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 */
> +               if (IS_GEN5(dev) || IS_GEN6(dev))
> +                       dev_priv->lvds_use_ssc = 0;
>  
>                 if (dev_priv->lvds_use_ssc) {
>                         if (IS_I85X(dev))
> 
> 
> -- 

Ugh, looks like I have confused things horribly.  Sorry about this.

2.6.37-rc8 with no patches works for me.  My original report was incorrect --
I was using -rc7 when I thought I was using -rc8.  :(

Regrets,
---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***
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