[ddccontrol-devel] DDCcontrol and Intel 82865G Integrated Graphics Controller

[William H. <wi...@ai...>]

Hi Nicolas

Great to see Intel support I have tried it on a couple of machines and in 
general it works great with  my 82865G Integrated Graphics Controller and 
an analog DSUB15 connector.

However this system has an Intel specific AGP daughter card (it's not a 
full video card, just DVI drivers) that has DVI output.

With a monitor connected to that card I can't communicate with the display 
using either GPIOA or GPIOB. Communications is always routed to the DSUB15 
connector.

I had a look through the Intel docs and it seems there is MDDC_CLK and 
MDDC_DATA (also MDVI_CLK and MDVI_DATA) for communicating with the monitor 
on the DVI connector. Info as follows:
-------------------------------
DDC (Display Data Channel)
The multiplexed digital display interface uses the MDVI_CLK and MDVI_DATA 
signals to interrogate the panel. The GMCH supports the DDC2B protocol to 
initiate the transfer of EDID data. The multiplexed digital display 
interface uses the M_I2C bus to interrogate the external
transmitter. A third set of signals (MDDC_CLK and MDDC_DATA) is available 
for a variety of
purposes. They can be used as a second DDC pair when two TMDS transmitters 
are used, or as a second I2C pair if there are multiple devices (e.g., PROM 
and DVO device) that need I2C and there is a speed or addressing conflict.

The GMCH implements a hardware GMBus controller that can be used to control 
these signals.
This allows higher speed transactions (up to 400 kHz) on theses lines than 
was allowed with
previous software centric 'bit-bashing' techniques.
-------------------------------

However I haven't been able to find any programming info (register offsets 
etc.) for this anywhere.

Has anyone got any info on this?

Thanks

Will

At 06:14 PM 7/15/2005 +0200, Nicolas Boichat wrote:
>Hello,
>
>I just released DDCControl 0.1.3 and ddccontrol-db-20050715.
>
>Changes in ddccontrol-0.1.3:
>  - Add support for i810/i815/i830/i845/i855/i865/i915/i945 chipsets,
>     thanks to Chernyavskyy Valentin for his tests.
>  - Add Russian translation, thanks to Sergei Epiphanov.
>---
>
>Changes in ddccontrol-db-20050715:
>  - Add Samsung SyncMaster 173P Plus support.
>  - Add support for the Fujitsu Siemens P17-2, P19-2 and P20-2 (thanks to
>Olaf Tauber, and thanks to Johann Leonhardmair of Fujitsu Siemens)
>  - Add Russian translation, thanks to Sergei Epiphanov.
>---
>
>Best regards,
>
>Nicolas Boichat
>
>
>
>
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