[Openicc] HP Elitebook 8540W notebook with Dreamcolor display

[Emil Briggs]

On Saturday 12 February 2011 10:20:34 Kai-Uwe Behrmann wrote:
> Am 12.02.11, 09:00 -0500 schrieb Emil Briggs:
> 
> > to see what was there and it gave me a "No displays found" message.
> > 
> > i2cdetect -l shows 10 separate /dev/i2c-* nvidia entries so the kernel
> > i2c support is there. I ran hpdc_util again with strace and started
> > looking through the code. The devices are opened successfully but
> > writing to them fails. I'm not quite sure how to proceed next. I do have
> > the Quadro graphics card with the proprietary driver. Just for kicks I
> > tried using the opensource nvidia driver but this does not work --
> > looking in the Xorg.0.log it finds the I2C/ddc interfaces but is unable
> > to read any EDID information from them.
> 
> Did you see the forum post on the ookala-mcf page around EDID?
> http://sourceforge.net/projects/ookala-mcf/forums/forum/898199/topic/339741
> 5
> 

I had not but it's not a permissions issue since I ran it as root after the it 
failed as a non privileged user.

> > The proprietary driver does have an option to enable 30 bit color so I
> > tried that. I see what you mean about the apps not being ready :)
> > 
> > I'm going to spend some time wrapping my head around the ookla code to
> > see if I can figure out why it's not working (though I suspect that it
> > may be related to the i2c kernel stuff).
> 
> What do you plan to do with it?
> 

Mainly I just wanted to be able to switch between the presets. HP supplies a 
Windows utility for notebooks with the Dreamcolor display that lets you select 
from 7 factory calibrations. The documentation for hpdc_util says that it can 
do that but I don't see any other way of doing so in Linux.

> Calibration of display internal LUTs is not much an option without a
> device SDK. The factory calibration for the standalone dreamcolor is quite
> good. Direct profiling is not a bad choice.
> 

I've got a color profiling device on order since I suspect that I may be out 
of luck otherwise since their is no guarantee the laptop display works the 
same as the standalone monitor.


> Btw. Oyranos has a tool called oyranos-monitor-nvidia, wich asks the
> nvidia driver to supply the EDID. EDID can be placed as a Xatom into the
> root window by the -p option.
> 

Thanks. I will check Oyranos out.

> kind regards
> Kai-Uwe Behrmann