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

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Message-ID: <cb7bb73a0702051328n50c889d9o461ac2bb9f9ea75e@mail.gmail.com>
Date:	Mon, 5 Feb 2007 22:28:36 +0100
From:	"Giuseppe Bilotta" <giuseppe.bilotta@...il.com>
To:	"Luca Tettamanti" <kronos@...ple.it>
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

On 2/5/07, Luca Tettamanti <kronos@...ple.it> wrote:
> 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).

No luck. i2c-dev and dependencies are loaded
""" lsmod | grep i2c reports """
i2c_i801                7404  0
i2c_isa                 5152  0
i2c_piix4               8140  0
i2c_algo_pcf            6180  0
i2c_algo_pca            5380  0
i2c_algo_bit            8424  0
i2c_dev                 8548  0
i2c_core               19680  7
i2c_i801,i2c_isa,i2c_piix4,i2c_algo_pcf,i2c_algo_pca,i2c_algo_bit,i2c_dev
""""

There is no such thing as /dev/i2c* UNLESS I load nvidiafb. When I
load that, I get three busses (i2c-0, -1, and -2), but i2cdump N 0x50
gives me a nice tableau of X's all around, for all values of N. This
is using kernel 2.6.18-3 stock Debian kernel. I'll keep trying with
some variations, to see if I can get more sensible information.

-- 
Giuseppe "Oblomov" Bilotta
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