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User profile for user: D.J. Ross
D.J. Ross Author
User level: Level 1
106 points

Monitor using wrong display profile--how do I change it?

I recently bought two new monitors (same model) and have them connected to my Mac Pro--one with DVI and the other through a KVM switch using a VGA-DVI adapter. The problem is that the second one (connected through the KVM) displays in the wrong resolution. When I open the Displays preferences, it looks like it's using a profile from my previous monitor and the Display tab shows the wrong list of resolutions.

Is there a way to delete this old profile, or at least get the resolution list to display more options? The second monitor works fine when I connect it directly via DVI, but I'd like to keep using it with my old KVM switch if possible. (DVI KVM switches are too expensive!)

2x2.66 GHz Mac Pro, Mac OS X (10.5.5)

Posted on Apr 30, 2009 9:11 PM

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User profile for user: nerowolfe
nerowolfe
User level: Level 6
13,090 points

Apr 30, 2009 9:18 PM in response to D.J. Ross

D.J. Ross wrote:
I recently bought two new monitors (same model) and have them connected to my Mac Pro--one with DVI and the other through a KVM switch using a VGA-DVI adapter. The problem is that the second one (connected through the KVM) displays in the wrong resolution. When I open the Displays preferences, it looks like it's using a profile from my previous monitor and the Display tab shows the wrong list of resolutions.

Is there a way to delete this old profile, or at least get the resolution list to display more options? The second monitor works fine when I connect it directly via DVI, but I'd like to keep using it with my old KVM switch if possible. (DVI KVM switches are too expensive!)


What happens if you click "detect displays"?

There is a display .plist which you can drag to the desktop and then log out and back in to reset.
It's
com.apple.preference.displays.001b63933178.plist
except that the number will be different.
It's in your local library/preferences directory.
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User profile for user: D.J. Ross
D.J. Ross Author
User level: Level 1
106 points

Apr 30, 2009 10:17 PM in response to D.J. Ross

I just tried installing a control panel called SwitchResX. It wouldn't let me change the resolution either, but I noticed that for the problematic monitor it still shows my old monitor's Vendor ID and Product ID. Is there somewhere I can reset those? I would have expected Detect Displays to cover that, but it still isn't doing anything when I click.

I have a Radeon X1900 in case that makes a difference.
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Monitor using wrong display profile--how do I change it?

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