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16mb and quartz extreme
Authored by: zarqman on Jul 29, '03 07:23:12PM

has anyone tested to see if, on a 16mb vid card, this causes quartz extreme to be disabled? i would assume that os x splits up the video memory somehow to handle both displays, which would leave each display less than 16mb. but i don't know if qe tests the total available video ram or if it tests how much is available for any given display. anyone?

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16mb and quartz extreme
Authored by: zarqman on Jul 29, '03 07:53:30PM

okay, so i decided to bite the bullet and test it myself. on my ibook/700 with 16mb vram, the results are better than i expected.

when dual display is active (eg: an external screen or tv is actively plugged in), the system splits the video ram and disables quartz extreme. when i unplug the second display, it immediately reenables quartz extreme.

as expected, selected 'mirrored' continues to leave quartz extreme enabled.

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quartz extreme works w/spanning+16MB VRAM
Authored by: video_guy on Jul 30, '03 04:55:58AM

zarqman, your concern is addressed towards the bottom of the following page:

I tried it and it works. When you get to the Resources folder (in the instructions below), do a Get Info (Apple - I) and change owner and permissions on all contents. Make yourself owner, with read and write privileges. Then modify Configuration.plist (drag it onto the TextEdit icon). When you're done with that, revert Resources' owner and permissions back.
What follows is from the website cited above:

After this patch Quartz Extreme will not be active while using two screens. This is the same problem as with the Powerbook G4 with 16 MB VRAM. You can fix this issue by changing the value of


in the file

System/Library/Frameworks/ApplicationServices.framework /Versions/A/Frameworks/CoreGraphics.framework /Versions /A/Resources/Configuration.plist

from 16 to 8.

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works on the 17 inch, 800 MHz iMac
Authored by: szabesz on Jul 30, '03 08:31:58AM

I have a 17 inch, 800 MHz iMac (it has a GeForce4), and the script is working!!!! Thank you! Now I can use my spare monitor, at last! I do not think it is working on previous models, as they have older video cards. It does not work with my 600MHz iBook though, which was one of the firts ones on the market.

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