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i2c adapter: Unable to read EDID block
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mistersnorfles
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Joined: 03 Aug 2007
Posts: 32

PostPosted: Fri Aug 03, 2007 11:29 am    Post subject: i2c adapter: Unable to read EDID block Reply with quote

I get the following error message at boot:

Code:

i2c_adapter i2c-1: unable to read EDID block
i2c_adapter i2c-1: unable to read EDID block
i2c_adapter i2c-1: unable to read EDID block
i2c_adapter i2c-1: unable to read EDID block
i2c_adapter i2c-1: unable to read EDID block
i2c_adapter i2c-1: unable to read EDID block
Non-DDC laptop panel detected
i2c_adapter i2c-1: unable to read EDID block
i2c_adapter i2c-1: unable to read EDID block
i2c_adapter i2c-1: unable to read EDID block
i2c_adapter i2c-1: unable to read EDID block
i2c_adapter i2c-1: unable to read EDID block
i2c_adapter i2c-1: unable to read EDID block


First of all, what is i2c and why am I getting this error? Do I actually need i2c for anything? It comes in between messages for radeonfb, so maybe it is related to that?

Second, what is a Non-DDC laptop panel? And should I worry about it not being detected.

I am running 2.6.20 (hardened sources) on a Dell Latitude C640 laptop, if that is of any assistance.

Thanks,
Mr. Snorfles
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NeddySeagoon
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Joined: 05 Jul 2003
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PostPosted: Fri Aug 03, 2007 1:55 pm    Post subject: Reply with quote

mistersnorfles,

i2c is a general serial interface used by lots of devices to provide set up data.
This particular instance is used by Xorg to read the display capabilities from the display. Normally down the VGA video cable.
Xorg then goes on to set up a format that makes optimal use of the display. This data is called the EDID or DDC data.

Some laptop displays do not support this. The data is included in the BIOS. Thats safe since you don't normally change the display included in a laptop for a different type. Eventually Xorg will look there too. Inculding the data in the BIOS allows some parts to be elimianted, reducing costs.

Most laptops can drive two displays, so you get two sets of status messages (not errors) as Xorg attempts to detect both displays.

The messages do not indicate a problem, its just Xorg telling what its doing.
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NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
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