Intel i915GM with SDVO CH7021A support?

Keith Packard keithp at
Tue Jan 2 09:25:26 PST 2007

On Tue, 2007-01-02 at 09:56 +0000, will wrote:
> Hi,
> I had a few days over xmas to have a look at this and managed to make some
> progress. I've got it working in the old driver (don't have a good excuse
> for not grabbing the new one sorry!), overscan gave me a bit of a headache
> but I got there in the end. I've managed to find most of the basic ports for
> changing settings, there are a few grey areas but I've gone as far as the
> time allowed. 

Hey, good work.

> I've modded the BIOS tracing "hack" that Dave posted, it was very useful.
> I've written a converter that goes from the GMBUS protocol (such as my BIOS
> uses them) to code that works with the bit banging routines in the i810
> driver. It also decodes the names of the SDVO op-codes such as they were in
> the header files I currently have. If this is useful to anyone let me know
> and I'll post a diff or something. More to the point I have a multitude of
> log files, I can post these if useful also.
> Let me know if you'd like to progress this any further, I can post code if
> it's useful, details of ports I've found and any other notes I may have (if
> I can remember what they are!). Now I'm back after the xmas break my time is
> probably going to be very limited but I'll try my best to sort something
> out. Btw is the PLL coding for i915 fixed in the mode setting i810 branch?

Yes, please post the code. If you have a chance, I think you'll find the
modesetting branch a lot easier to work in for this kind of thing, it
has SDVO communication code all set up.

keith.packard at
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