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

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Date:	Sat, 24 Feb 2007 15:04:54 +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 Fri, 2007-02-23 at 14:34 +0100, Giuseppe Bilotta wrote:
> On 2/23/07, Antonino A. Daplas <adaplas@...il.com> wrote:
> > On Thu, 2007-02-22 at 20:08 +0100, Giuseppe Bilotta wrote:
> > > 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're right, I hadn't realized that. I can now access all the sizes
> from 640 to 1600, so I would say the fix is valid.

Okay, thanks.

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

Tony

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