# mac:  screen('WaitBlanking') problem

**URL:** <https://psychtoolbox.discourse.group/t/mac-screen-39-waitblanking-39-problem/1007>\
**Category:** Uncategorized\
**Created:** [July 10, 2003, 11:02pm UTC](https://psychtoolbox.discourse.group/t/mac-screen-39-waitblanking-39-problem/1007 "2003-07-10T23:02:40Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![akatsov](https://avatars.discourse-cdn.com/v4/letter/a/58956e/32.png) [@akatsov](https://psychtoolbox.discourse.group/u/akatsov)\
**Post date:** [July 10, 2003, 11:02pm UTC](https://psychtoolbox.discourse.group/t/mac-screen-39-waitblanking-39-problem/1007/1 "2003-07-10T23:02:40Z")

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Hi,  
  
I have a problem synching with my monitors. I have ATI Radeon 8500 Pro   
driving 2 CRTs; I am running MATLAB 5.2.1 from OSX. When I query the   
refresh rate with screen('resolution'), the value in res.hz is same as the value   
set in system preferences. When I query the rate with screen('framerate'), the   
value is always 60 Hz. WaitBlanking appears to operate based on 60 Hz   
regardless of what the actual refresh rate is.  
  
What should I do about this?  
  
I'd be happy to provide more information if necessary.  
  
Thanks very much,  
  
Alex