[cups] Brother BIG inkjet, can't make it use near enough ink

[Gene Heskett]

Greetings cups people;

I bought this MFC-J6920DW printer to replace a CDW color laser about 2 year ago, and am finally tired of the extremely pastel printing its doing. None 
of the color tweaker settings on the advanced color page I can see looking at localhost:631/printers/any profile, has any effect, as if that data is 
being stripped from the data stream between clicking on print, with or without gutenprint.

Needless to say its extremely stingy in its use of ink.

Install is wheezy, completely up to date, 32 bit version.

Cups is 2.8.2.

Here is a snip of the /var/log/cups/error_log for my last attempt to 
print a screen-snapshot.jpg that when viewed in gimp is exactly the 
same as the original screen, except for the size of the gimp working 
window.  Black is dead black on screen, whether its the original or 
the snapshot, but black, on glossy photo paper is a wee bit blotchy, 
and would be very hard put to be any blacker, if as dark as a kodak 
18 % grey card.

The error_log:
W [16/Dec/2018:15:32:19 -0500] failed to CreateProfile: org.freedesktop.ColorManager.AlreadyExists:profile id 'MFCJ6920DW-Gray..' already exists
W [16/Dec/2018:15:32:19 -0500] failed to CreateProfile: org.freedesktop.ColorManager.AlreadyExists:profile id 'MFCJ6920DW-RGB..' already exists
W [16/Dec/2018:15:32:19 -0500] failed to CreateDevice: org.freedesktop.ColorManager.AlreadyExists:device id 'cups-MFCJ6920DW' already exists
E [16/Dec/2018:15:32:19 -0500] Failed to update TXT record for MFCJ6920DW @ coyote: -2
W [16/Dec/2018:15:36:03 -0500] failed to CreateProfile: org.freedesktop.ColorManager.AlreadyExists:profile id 'MFCJ6920DW-Gray..' already exists
W [16/Dec/2018:15:36:03 -0500] failed to CreateProfile: org.freedesktop.ColorManager.AlreadyExists:profile id 'MFCJ6920DW-RGB..' already exists
W [16/Dec/2018:15:36:03 -0500] failed to CreateDevice: org.freedesktop.ColorManager.AlreadyExists:device id 'cups-MFCJ6920DW' already exists
W [17/Dec/2018:00:40:19 -0500] failed to CreateProfile: org.freedesktop.ColorManager.AlreadyExists:profile id 'MFCJ6920DW-Gray..' already exists
W [17/Dec/2018:00:40:19 -0500] failed to CreateProfile: org.freedesktop.ColorManager.AlreadyExists:profile id 'MFCJ6920DW-RGB..' already exists
W [17/Dec/2018:00:40:19 -0500] failed to CreateDevice: org.freedesktop.ColorManager.AlreadyExists:device id 'cups-MFCJ6920DW' already exists
W [18/Dec/2018:16:08:01 -0500] failed to CreateProfile: org.freedesktop.ColorManager.AlreadyExists:profile id 'MFCJ6920DW-Gray..' already exists
W [18/Dec/2018:16:08:01 -0500] failed to CreateProfile: org.freedesktop.ColorManager.AlreadyExists:profile id 'MFCJ6920DW-RGB..' already exists
W [18/Dec/2018:16:08:01 -0500] failed to CreateDevice: org.freedesktop.ColorManager.AlreadyExists:device id 'cups-MFCJ6920DW' already exists

That looks somewhat like a perms problem, but its been there since at 
least 2, maybe 3 years. I think its time it was fixed. FWIW, these 
tweakers also had very little effect on the Brother CDW-3170DW that 
held that paper box down for 7 years or so, until I could not convince 
the factory tech it needed a new corona voltage generator card.

I am a CET, and if I ever get some bench space opened up, I may see if 
I can fix it, a tired electrolytic capacitor would be the most likely 
culprit, and I do have an ESR tester.

Where do those files its fussing about actually exist on a wheezy system?

Many thanks for suggestions folks.

And have a Merry Christmas too.
 
-- 
Cheers, Gene Heskett
--
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>