[argyllcms] conjgrad failed

Hi

I go on with my investigations...
If I download the x86 binary on the site, it seems to work in 32bit. It
must be a 64bit issue, if someone has an idea of this issue and want me
to test, no problem.

Yet, it does not totally work, dispcal fails to create the calibration
file. I detect two strange things: the target black got a nan value and
it fails with a conjgrad error:

:~/test32/bin$ ./dispcal -i92 -a ../log/test
Offset calibration:
Place instrument on a dark surface.
Hit Esc to skip, any other key to start calibration:
Offset calibration successful
The instrument can be removed from the dark surface.
Cell ratio calibration:
Place instrument on test window.
Hit Esc to skip, any other key to start calibration:
Cell ratio calibration successful
The instrument can be removed from the screen.
Place instrument on test window.
Hit Esc to give up, any other key to continue:

Press 1 .. 7
1) Black level (CRT: Brightness)
2) White point (Color temperature, R,G,B, Gain)
3) White level (CRT: Contrast, LCD: Brightness)
4) Black point (R,G,B, Offset)
5) Check all
6) Continue on to calibration
7) Exit
Doing some initial measurements

Adjust CRT brightness to get target level. Press space when done.
   Target 0.45
\ Current 0.00  +

Press 1 .. 7
1) Black level (CRT: Brightness)
2) White point (Color temperature, R,G,B, Gain)
3) White level (CRT: Contrast, LCD: Brightness)
4) Black point (R,G,B, Offset)
5) Check all
6) Continue on to calibration
7) Exit
Doing check measurements

  Current Brightness = 44.65
  Target 50% Level  = 9.72, Current =  6.68, error = -6.8%
  Target Near Black =  0.45, Current =  0.00, error = -1.0%
  Current white = x 0.3015, y 0.3077, VDT 7958K DE  6.6
  Target black = x 0.3015, y 0.3077, Current = x 0.0000, y 0.0000, error
=   nan DE

Press 1 .. 7
1) Black level (CRT: Brightness)
2) White point (Color temperature, R,G,B, Gain)
3) White level (CRT: Contrast, LCD: Brightness)
4) Black point (R,G,B, Offset)
5) Check all
6) Continue on to calibration
7) Exit
dispcal: Error - Conjgrad failed


Any help appreciated ;-)

Mike

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