On Fri, Jun 6, 2008 at 6:01 AM, Jean Delvare [off-list ref] wrote:

Hi Ben,

Can you explain what is the "monid" i2c bus on Radeon adapters? I have
two Radeon chips here, an M6 in my old laptop and a 9200 in my desktop
system. On the M6 there is nothing on the monid bus. On the 9200, the
monid bus doesn't even work, every access results in timeout. The
radeonfb driver doesn't even look for EDID EEPROMs on that bus (except
in debug code.)

So I'm curious why you create this i2c bus if you don't need it.
Have you ever seen a Radeon adapter where there is something on that
bus?

There are several i2c busses available on radeons and different OEMs
use different combinations.  The bus used by each display output is
listed in the connector table in the vbios rom on x86 cards.  Other
uses include controlling external TMDS or DAC chips on some cards.
This info is also available via the bios tables on x86 cards.

Alex

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