[Openicc] XRandR and nv/nvidia was: [Re: [argyllcms] Re: ArgyllCMS Version 1.0.0 released]

[Hal V. Engel]

On Tuesday 08 July 2008 06:00:48 am Graeme Gill wrote:
> Kai-Uwe Behrmann wrote:
> > nv/nvidia drivers dont supports XRandR and especially 1.2.
> > I pinged already Aaron Plattner on the xorg list about nv and elsewhere
> > about the nvidia driver.
>
> Why are they claiming to then ? The Argyll XRandR 1.2 code only gets
> executed when XRRQueryVersion(mydisplay, &majv, &minv) returns 1.2 or
> greater, otherwise it falls back to the Xinerama code. With the patched
> code, setting the ARGYLL_IGNORE_XRANDR1_2 environment variable has the 
same
> effect as the XRandR extension not being present, or returning a
> version < 1.2.
>
> Graeme Gill.


According to nvidia the nv driver only has support for randr 1.2 for NV5  GPUs 
(8xxx and 9xxx cards).  Kai-Uwe is this the type of hardware you were using?   


Nvidia's support of the video card LUTs has not been good for a long time.  
WIth the nvidia driver you can not access the gamma tables for the individual 
monitors if you are using "TwinView" to handle multi monitor setups.  But you 
can if you are using Xinerama.  But you can not use any of the composing 
setups if you are using Xinerama.  So you can have either composting or 
correctly setup LUTs but not both.  


I was told over a year ago by Aaron Plattner that they had an open ticket to 
add RandR 1.2 support specifcally to address the per monitor LUT issue and on 
the nvnews linux forums, the forum that the nvidia linux developers use to 
interact with users, users regularly complain about this issue.   Kai-Uwe have 
you raised the issue there?


Are the video LUT RandR 1.2 features fully functional on any video driver at 
this point?


Hal
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