linux-kernel - Re: [Linux-fbdev-devel] [PATCH] nvidiafb: allow ignoring EDID info

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Message-Id: <1172351769.4415.5.camel@daplas>
Date:	Sun, 25 Feb 2007 05:16:08 +0800
From:	"Antonino A. Daplas" <adaplas@...il.com>
To:	Giuseppe Bilotta <giuseppe.bilotta@...il.com>
Cc:	James Simmons <jsimmons@...radead.org>,
	Luca Tettamanti <kronos@...ple.it>,
	linux-fbdev-devel@...ts.sourceforge.net,
	Andrew Morton <akpm@...l.org>, Dave Airlie <airlied@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [Linux-fbdev-devel] [PATCH] nvidiafb: allow ignoring EDID info

On Sat, 2007-02-24 at 10:16 +0100, Giuseppe Bilotta wrote:
> On 2/24/07, Antonino A. Daplas <adaplas@...il.com> wrote:
> > On Fri, 2007-02-23 at 14:34 +0100, Giuseppe Bilotta wrote:
> > >
> > > The snowy is constant and abundant, and it seems to be independent of
> > > video size (640 through 1600) and screen occupation (single prompt
> > > line to fullscreen mc session) and usage.
> > >
> > > > I presume that X's nv driver or vesafb does not exhibit this problem?
> > >
> > > X's nv gives a very clean display, /unless/ I load nvidiafb before: if
> > > I modprobe nvidiafb (it's a module, and it's blacklisted precisely for
> > > this reason), then the screen is very snowy with X's nv too.
> > >
> >
> > Hmm..., I really don't know how to fix this except to look at Xorg's
> > code and look for a difference.
> 
> Keep in mind that setting nvidiafb to totally ignore the EDID (either
> by not compiling in EDID support or by using e.g. the ignoreedid patch
> I had proposed) the snow effect is extremely reduced,

I did not know that, just scanned the entire thread. Try this patch, it
makes use of fb_ddc_read*() which I believe has extra steps to prevent
display corruption.  It also incorporates Luca's i2c fix.

Tony


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