[OpenICC] monitor/videocard identification

[Ben Guthro]

I have been looking into a solution such as this for the past couple of 
years

knowing which monitor is attached to which graphics card, associated 
with what coordinates  has been a problem under *nix in my development 
so far for a display calibration system.

For those displays that support it, the EDID information can be 
obtained via i2c-dev, with the proper command set. X does support this 
to a certain degree on certain graphics boards by setting an X atom 
containing the EDID information. However, this becomes problematic in a 
Xinerama solution where only one display object is exposed.

Adjusting other DDC controls (Brightness, contrast, color gains) of a 
DDC/ci capable display can be achieved via the i2c-dev kernel module 
with the correct application calls.

Associating an ICC profile with a particular display is somewhere that 
seems to be currently lacking in linux. The xf86vmSetGammaRamp (I think 
thats the call) specifies one display object, and again in a Xinerama 
solution, only one is exposed. Therefore only one gamma ramp may be set 
for both displays.

If Oyranos could expose any of this functionality any better than it is 
currently, I think that it would make for some drastic improvements in 
the capabilities of the color management solution.


Ben


Ben Guthro
Software Engineer
Center of Excellence for Display Technologies
a Gretag Macbeth Company
603.681.0315 x234


On Dec 5, 2004, at 4:03 AM, Kai-Uwe Behrmann wrote:

> Hi,
>
> I am unshure how to identify monitor / video card combinations.
> The concrete questions would be :
> Tell me about manufacturer, product, unique device number, additional
> hardware settings (monitor brightness, gamma table in remote video 
> card).
>
>
> One way would be to let it outside the of the CMS; every application 
> had
> to take care about. Maybe X can answere identify this devices more 
> easily
> than CMS configurator (Oyranos). The concept would be to tell Oyranos
> attributes and as answere would come an profile or identifier.
>
> The other way around would bring Oyranos in the situation to handle
> queries about devices for nearly all systems - networktransparent 
> video as
> well as remote printers or scanner devices + handling camera 
> connections.
> What does the list think. Is the last option not very error proune /
> overkill ?
>
> regards
> Kai-Uwe Behrmann
>                                 + imaging development / panoramas
>                                 + color management
>                                 + email: ku.b at gmx.de
>                                 + CMS proposal <www.behrmann.name>
>
>
> PS: Bob, cc-ing You as it may be of interesst.
>
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