[argyllcms] Re: ucmm screen selection by output name?

  • From: Andy Lutomirski <amluto@xxxxxxxxx>
  • To: "argyllcms@xxxxxxxxxxxxx" <argyllcms@xxxxxxxxxxxxx>
  • Date: Thu, 29 Oct 2009 21:37:43 -0700

On Oct 29, 2009, at 6:59 PM, Graeme Gill <graeme@xxxxxxxxxxxxx> wrote:

Andrew Lutomirski wrote:
The RandR EDID property appears to be completely broken on my system
(*sigh*), but the calibration I care about applies to my LCD panel,

Is the EDID missing, or is it in a differently named property ?

The EDID isn't there at all. It's a bug in the 2.7.0 intel driver, fixed upstream, and now patched on my machine. Fedora 11 hasn't picked up the fix.

which is easily identified because it's called LVDS1.  Is it possible
to specify in color.jcnf that a profile applies to a named output?

Not currently. It's possible to add this I guess.

(This is probably more useful nowadays than Xinerama notation even if
EDID worked.)

Since the profile is primarily a characterization of the display,
it's better if it tracks the display, not the port it's plugged into.

LVDS more-or-less uniquely identifies the display, since you have to take apart the laptop to plug anything else in.

Does the X11 display name not work for you, or does it have practical
issues ?

The display number doesn't work. My system lists VGA first, so when I plug in an external monitor, my laptop panel changes from 1 to 2.

Since I got EDID working by rebuilding the driver, this isn't a big deal for me anymore.

I'd hope that the EDID stuff will get sorted out at some stage,
and in fact some portal to access the DDC/CI channel to the display
(although there seems to be relatively little interest in the Linux/ X11
world in getting color working).

There's an old, unmaintained, and somewhat hackish tool called ddccontrol (or ddcontrol, maybe) that can issue DDC/CI commands, and even has a GUI. Ideally it would use an X extension, I suppose.

Are there any public docs for useful DDC/CI commands for color management? My HP LP2475w (iirc --I'm not near it right now) has some mysterious "minimum red/green/blue" controls that only show up on DDC/ CI.


Graeme Gill.

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