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You are here: MacNN Forums > Software - Troubleshooting and Discussion > Mac OS X > How to force 60hz refresh rate?

How to force 60hz refresh rate?
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Grizzled Veteran
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Jan 20, 2003, 03:16 PM
 
Does anyone know how to edit the list of recommended settings shown in the display preferences and the display system menu?

I have an LCD screen and a scan converter which both work much better at 60Hz. Unfortunately, OS X wants me to use 75Hz. I'm hoping that there is a simple plist or text file somewhere that I can edit or set a login script to modify...
     
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Jan 20, 2003, 03:50 PM
 
Uncheck "Show modes recommended by display" and then choose whichever setting you like.
     
dfiler  (op)
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Jan 21, 2003, 07:17 AM
 
Originally posted by MrNo:
Uncheck "Show modes recommended by display" and then choose whichever setting you like.
Uh...

Originally posted by dfiler:
Does anyone know how to edit the list of recommended settings shown in the display preferences and the display system menu?
     
Mac Elite
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Jan 21, 2003, 08:45 AM
 
So did you do it and get the full list not just the reccommended list?

No need to be so

Edwin

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dfiler  (op)
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Jan 21, 2003, 09:56 AM
 
Originally posted by edddeduck:
So did you do it and get the full list not just the reccommended list?

No need to be so

Edwin

Ilove that stick smiley
Sheesh! When did people forget how to read?

I'll post the question again just in case anyone missed it.

'Does anyone know how to edit the list of recommended settings shown in the display preferences and the display system menu?'
     
Mac Elite
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Jan 21, 2003, 10:06 AM
 
Can you set 60Htz mode in the display prefs after deselecting the "show recomended modes" button?

If NO this would be useful to know as you seem to have two issues.

1.Edit the list
2.Get it working at 60Htz

I was just checking you had got Q2 working. If you have I will start on having a look for 1.

Cheers Edwin
     
dfiler  (op)
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Jan 21, 2003, 11:53 AM
 
Yes, 60hz is an available but not recommended setting.

Back to the question at hand: How can one 'edit the list of recommended settings'?

It really is that simple... I want to 'edit the list of recommended settings'!
     
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Jan 21, 2003, 12:02 PM
 
Originally posted by dfiler:
I want to 'edit the list of recommended settings'!
I don't know how, but why do you need to? You set it once and forget it. If it is having problems remembering the settings, delete the com.apple.windowserver.plist file in /library/preferences
     
dfiler  (op)
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Jan 21, 2003, 12:09 PM
 
Originally posted by SMacTech:
I don't know how, but why do you need to? You set it once and forget it. If it is having problems remembering the settings, delete the com.apple.windowserver.plist file in /library/preferences
Why? So that the display system-menu has only the correct refresh rate. Otherwise, the menu is rather useless and resolution switching becomes a real pain.
     
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Jan 21, 2003, 12:39 PM
 
The recomented settings are provided by the monitor itself. You can not edit any file to change this.

The only option is to get the disply woking at 60 is to over ride the recomendations by unchecking the box, and then select 60.
Alex Duffield
http://www.incontrolsolutions.com
Fatal error: Call to undefined function: signature() in /usr/local/www/htdocs/showthread.php on line 813
     
dfiler  (op)
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Jan 21, 2003, 12:56 PM
 
Originally posted by Alex Duffield:
The recomented settings are provided by the monitor itself. You can not edit any file to change this.

The only option is to get the disply woking at 60 is to over ride the recomendations by unchecking the box, and then select 60.
While its not possible to modify which settings a monitor will report as supported, it is possible to modify the list of 'recommended' settings listed in the system menu and display preferences.

The question is, can this be done by editing human-readable (non-bined, hexed, or otherwise encoded) data stored somewhere on disk or in RAM. I'm not motivated enough to reverse engineer a random data format embeded somewhere in ram. However, I would be willing to write a quick script to modify a text file containing the currently supported resolutions. I am hoping that OS X stores suppported resolutions after determining these during the boot process. If so, a quick edit to some rc files and we're in business.

Currently, users must take great care to select a valid resolution. If they make a mistake, it is neccessary to reboot. If the machine defaulted to 'recommended' settings only, none of the resolutions are valid.

I've brought this issue to apple's attention so hopefully they fix this. They've fixed the last 2 problems that I complained about.
I Even got an email notification when the 'bug' was fixed.
     
   
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