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

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Message-Id: <1172187249.4279.7.camel@daplas>
Date:	Fri, 23 Feb 2007 07:34:09 +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 Thu, 2007-02-22 at 20:08 +0100, Giuseppe Bilotta wrote:
> On 2/22/07, Antonino A. Daplas <adaplas@...il.com> wrote:
> > On Thu, 2007-02-22 at 16:55 +0100, Giuseppe Bilotta wrote:
> > >
> > > However, I'm still getting the same snowy effects, which doesn't come
> > > as a surprise since the actual mode timings used are just the same ...
> >
> > Yes, because the EDID has only 1 mode entry. But now you can use 'fbset
> > 1024x768-60' (or any mode smaller than 1600x1200-60) for example and it
> > should work.
> 
> No, it doesn't. I've tried all the methods from 640x480 to 1600x1200,
> and they /all/ come up snowy. This is starting to look queerer and
> queerer. I've also tried changing vf min and max as you suggested:

Before we proceed, do you agree that the patch will allow you to change
video modes without disabling DDC support?  So this is still a valid
fix?

> 
> >  You might want to change  vfmin and vfmax to 59 and 61
> 
> and even the M and MR methods which you suggested in the other email.
> Since nvidiafb is being loaded from the command line because it's a
> blacklisted module otherwise, I've been using the mode_option option.
> However, neither the mode_option nor fbset seem to give me anything
> not snowy.

When does your display become snowy? Is the snow constant or does it
only snow when doing heavy text operations, such as scrolling?

I presume that X's nv driver or vesafb does not exhibit this problem?

Tony


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