Vision Egg Development List

Qian Xie | 18 Jun 2010 21:01

vertical sync?

Hi all,

VisionEgg reports the message below when I try to run my program:
"WARNING: Unable to detect or automatically synchronize buffer swapping with vertical retrace. May be
possible by manually adjusting video drivers. (Look for 'Enable Vertical Sync' or similar.) If buffer
swapping is not synchronized, frame by frame control will not be possible. Because of this, you will
probably get a warning about calculated frames per second different than specified."

Here is the info on my video card:
INFO: OpenGL 3.2.9551 Compatibility Profile Context, ATI Radeon HD 3400 Series, ATI Technologies Inc.
(PyOpenGL 3.0.1)

I'm running this on a Windows XP machine with a LCD monitor 1909Wf as the primary monitor (I'm running it with
dual screen)

We are running a program that displays stimulus on the screen for certain amount of time and then gets the
reaction time from the participant. Will the error above influence the accuracy of the results? Does this
matter on a LCD screen? Is this a hardware issue? How can I fix the error?

Thank you!
Xie
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Gary Lupyan | 29 Aug 2010 06:13

Re: vertical sync?

Hi, were you able to solve this problem?  I am getting the same warning...

Qian Xie <qian.xie <at> ...> writes:

> 
> Hi all,
> 
> VisionEgg reports the message below when I try to run my program:
> "WARNING: Unable to detect or automatically synchronize buffer swapping with
vertical retrace. May be
> possible by manually adjusting video drivers. (Look for 'Enable Vertical Sync'
or similar.) If buffer
> swapping is not synchronized, frame by frame control will not be possible.
Because of this, you will
> probably get a warning about calculated frames per second different than
specified."
> 
> Here is the info on my video card:
> INFO: OpenGL 3.2.9551 Compatibility Profile Context, ATI Radeon HD 3400
Series, ATI Technologies Inc.
> (PyOpenGL 3.0.1)
> 
> I'm running this on a Windows XP machine with a LCD monitor 1909Wf as the
primary monitor (I'm running it with
> dual screen)
> 
> We are running a program that displays stimulus on the screen for certain
amount of time and then gets the
> reaction time from the participant. Will the error above influence the
accuracy of the results? Does this

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