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

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Message-Id: <1172133646.4086.5.camel@daplas>
Date:	Thu, 22 Feb 2007 16:40:45 +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 09:01 +0100, Giuseppe Bilotta wrote:
> On 2/22/07, Antonino A. Daplas <adaplas@...il.com> wrote:
> > On Wed, 2007-02-07 at 00:08 +0100, Giuseppe Bilotta wrote:
> > >
> > > As mentioned in another post in this thread, I can't get any info out
> > > of the i2c busses, because even when I have them available (i.e. after
> > > loading nvidiafb) I get XXXX all around (on all three of them).
> > > Suggestions on how to get the information welcome.
> >
> > Is this the same monitor you posted here?
> >
> > http://marc.theaimsgroup.com/?l=linux-kernel&m=112807065616218&w=2
> >
> > If yes, we already have the manufacturer and model code. The main
> > problem is that the EDID of this display has no sync range (H: 75-75kHz
> > and V: 60-60Hz).  Extending Hsync from 30-75kHz as a fix to the EDID
> > block shouldn't be too hard.
> 
> Yes, that's it! Jeepers, I can't believe that even re-reading the past
> LKML posts (even those!) I couldn't find the EDID info and how we had
> gotten them. I guess I need stronger glasses.
> 
> Wonder why Luca's proposed patch makes the EDID undetectable, now, and
> why can't it be retrieved at a later time via i2c. Timeouts too small?
> 
> > I already have a patch for this which I forgot to send to you
> > before :-).  If you can confirm that this is still the same hardware,
> > I'll send you a test patch
> 
> Yes, it's the same hardware. I can try the patch, with or without Luca's.
> 
> 

Okay. Patch attached.  You may want to #define DEBUG in
drivers/video/fbmon.c so we can appreciate what happens. Load nvidiafb
with DEBUG defined before and after applying the patch, then send your
'dmesg'.

Tony

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