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I have already asked this question on computer graphics site but i think it would be more appropriate to do it here.

I have a late 2006 mac pro 1.1 with possibly replaced graphics card (now ATI Radeon HD 2600). Trying to use two monitors setup side by side, same Samsung 23.5'' CF396's with pretty close serial numbers, both from the same retailer.

The problem is, when I try to calibrate the monitors, they act like separate displays and I can separately calibrate both of them. Calibration and assignment for first monitor works like advertised, but when I try to calibrate the second one, calibration affects the monitor until I press the finish and close button. After the click, second monitors goes back to uncalibrated state and new calibration is being assigned to the first one.

This is the information gathered from the System Information >> Graphics/Displays tab.

Displays:
C24F390:
  Resolution:   1920 x 1080 @ 60 Hz
  Pixel Depth:  32-Bit Color (ARGB8888)
  Display Serial Number:    HTQM100539  
  Main Display: Yes
  Mirror:   Off
  Online:   Yes
  Rotation: Supported
C24F390:
  Resolution:   1920 x 1080 @ 60 Hz
  Pixel Depth:  32-Bit Color (ARGB8888)
  Display Serial Number:    HTQM100623  
  Mirror:   Off
  Online:   Yes
  Rotation: Supported

I don't know if it is the expected behavior to show both displays under the same name "C24F390" but other than that it looks what I would like to see.

I read that macs are capable to assign different profiles to different monitors but whenever I click a profile, from the tab in first or second monitor it doesn't matter, only the first monitors gamut is changing. Am I doing something wrong on the procedure?

  • It's seeing both monitors, as there are 2 serial numbers. If you name your icc profiles differently, then go to System prefs>Displays>Colour, then check 'show profiles for this display only' what do you see? – Tetsujin Apr 30 at 13:40
  • Three default profiles, one profile named with name C24F390 (probably automatically created) and two profiles s1 and s2 that i have just created, six in total. And there is two color tab windows one on each monitor, both shows the same name on top of them. Doesn't matter from witch tab I chose the profile, only the first monitor updates and the other tab automatically selects the one i clicked on the other side. But second monitor reveals no changes. – FFaFafy May 1 at 8:33
  • OK, that for me eliminates "you doing anything wrong". Unfortunately it's been so long since I even saw Lion that I'm really not sure where to go next. I used to have similar issues with a machine not being certain which screen was which - it would swap which was primary/secondary, which if I vaguely recall, was eventually solved by connecting one over VGA, the other over DVI, which seemed to force the recognition. I'm really not sure if that may be relevant in this case. – Tetsujin May 1 at 8:38
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    My mac allows only two outputs, and both are DVI's. I am converting both of them to VGA's so I can connect it to my monitor, which only allows one VGA and one HDMI. I will try to output the second one via converting to HDMI. Will keep you posted if it works or not. Thanks for your time btw. – FFaFafy May 1 at 12:48

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