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

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Message-ID: <20070205201824.GA13431@dreamland.darkstar.lan>
Date:	Mon, 5 Feb 2007 21:18:24 +0100
From:	Luca Tettamanti <kronos@...ple.it>
To:	Giuseppe Bilotta <giuseppe.bilotta@...il.com>
Cc:	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

Il Sun, Feb 04, 2007 at 10:17:08PM +0100, Giuseppe Bilotta ha scritto: 
> On 2/4/07, Luca Tettamanti <kronos@...ple.it> wrote:
> >Giuseppe, can you send me the EDID block of your monitor?
> 
> I'd gladly do it, if I knew how to retrieve it ... because apparently,
> get-edid doesn't work, even though both the nv driver for X and
> nvidiafb manage to retrieve it.

get-edid uses the BIOS, while the other two talk directly over the I2C
bus.

Try loading i2c-dev (I2C_CHARDEV); With i2cdump[1] you can read the EDID
block, which resides at address 0x50:

i2cdump N 0x50 (where N is the bus number)

If you are unshure about bus number try with all the available
/dev/i2c-* devices (you may want to unload HW monitor drivers first, so
you don't poke at random stuff).

Luca
[1] lm-sensors package, at least on Debian.
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