Hi
here's the output of DescribeComputer and then of DescribeComputer.
output of DescribeComputer.m
****** KAREEV-LAB-2 running Windows XP Service Pack 1 ******
Single Intel Pentium Pro|Pentium II with 255MB RAM, 84MB free and
66% load.
DirectX 4.8 release 1.810
Psychtoolbox 0, .6 26 October 2005, Matlab 6.5.1.199709 (R13)
Service Pack 1
Output of DotDemo.m
doublebuffer =
1
PTB-WARNING: Your graphics driver doesn't allow me to control
syncing wrt. vertical retrace!
PTB-WARNING: Please update your display graphics driver as soon as
possible to fix this.
PTB-WARNING: Until then, you can manually enable syncing to VBL
somewhere in the display settings
PTB-WARNING: tab of your machine.
PTB-INFO: This is the Screen-Prototype for PTB 1.0.7, intended as
update for Psychtoolbox 1.0.6
PTB-INFO: Implementation details may change in the final release for
Psychtoolbox 1.0.7 - Use at your own Risk!
OpenGL-Extensions are: GL_WIN_swap_hint GL_EXT_bgra
GL_EXT_paletted_texture
PTB-WARNING: Couldn't even collect one single valid flip interval
sample! Sanity range checks failed!
PTB-WARNING: Couldn't even collect one single valid flip interval
sample! Sanity range checks failed!
PTB-WARNING: Couldn't even collect one single valid flip interval
sample! Sanity range checks failed!
PTB-INFO: OpenGL-Renderer is Microsoft Corporation :: GDI Generic ::
1.1.0
PTB-Info: VBL startline = 768 , VBL Endline = -1
PTB-Info: Measured monitor refresh interval from VBLsync = 0.000000
ms [1.#INF00 Hz]. (0 valid samples taken, stddev=10000000.000000 ms.)
PTB-Info: Reported monitor refresh interval from operating system =
13.333333 ms [75.000000 Hz].
PTB-Info: Small deviations between reported values are normal and no
reason to worry.
PTB-WARNING: Your graphics hardware & driver doesn't support OpenGL
rectangle textures.
PTB-WARNING: This won't affect the correctness or visual accuracy of
image drawing, but it can significantly
PTB-WARNING: degrade performance/speed and increase memory
consumption of images by up to a factor of 4!
PTB-WARNING: If you use a lot of image stimuli (DrawTexture,
Offscreen windows, Stereo display, Quicktime movies)
PTB-WARNING: and you are unhappy with the performance, then please
upgrade your graphics driver and possibly
PTB-WARNING: your gfx hardware if you need higher performance...
WARNING: Couldn't compute a reliable estimate of monitor refresh
interval! Trouble with VBL syncing?!?
WARNING: Mismatch between measured monitor refresh interval and
interval reported by operating system.
This indicates massive problems with VBL sync.
WARNING: Measured monitor refresh interval indicates a display
refresh of less than 25 Hz or more than 250 Hz?!?
This indicates massive problems with VBL sync.
----- ! PTB - ERROR: SYNCHRONIZATION FAILURE ! ----
One or more internal checks (see Warnings above) indicate that
synchronization
of Psychtoolbox to the vertical retrace (VBL) is screwed up for your
setup.
This would have the following bad effects:
- Screen('Flip') not synchronizing to the VBL -> Flicker & tearing
artifacts, messed up stimulus onset and offset timing.
- Wrong stimulus presentation timing and/or wrong synchronization of
Matlab to the VBL.
- Inaccurate or completely wrong timestamps (VBLTimestamp,
StimulusOnsetTime, FlipTimestamp) for stimulus timing reported by
Flip
- Inaccurate or completely wrong rasterbeam positions and monitor
refresh intervals reported by Screen('Flip') and Screen('Framerate')
Please try the following measures in the given order to solve or
work-around the problem:
1. Make sure that your machine is not running other demanding
software in parallel and then retry.
2. If you use a dual/multi-display setup, please put all displays in
mirror-mode with same resolution and color depth,
but different monitor refresh interval (set stimulus display to
higher refresh rate).
3. If it doesn't help or is not possible, try to change assignment
of the primary- and secondary display in the Display
Preference settings of MacOS-X.
4. On desktops or tower machines with two external display
connectors, *PHYSICALLY* swap the connections, aka
which display is plugged into which video-out socket at the back-
side of your computer.
5. If that fails or is not possible on dual- or multi-display
setups, disconnect or disable all displays except
the one for stimulus presentation to the subject.
If everything else fails, please report your problem including all
these messages and information on your specific
setup (Type of graphics card and connected displays, output
of 'DescribeComputer') to the Psychtoolbox forum.
-> You may have found a bug in Psychtoolbox, MacOS-X or your
graphics-hardware.
ans =
0
Thanks, Oren
here's the output of DescribeComputer and then of DescribeComputer.
output of DescribeComputer.m
****** KAREEV-LAB-2 running Windows XP Service Pack 1 ******
Single Intel Pentium Pro|Pentium II with 255MB RAM, 84MB free and
66% load.
DirectX 4.8 release 1.810
Psychtoolbox 0, .6 26 October 2005, Matlab 6.5.1.199709 (R13)
Service Pack 1
Output of DotDemo.m
doublebuffer =
1
PTB-WARNING: Your graphics driver doesn't allow me to control
syncing wrt. vertical retrace!
PTB-WARNING: Please update your display graphics driver as soon as
possible to fix this.
PTB-WARNING: Until then, you can manually enable syncing to VBL
somewhere in the display settings
PTB-WARNING: tab of your machine.
PTB-INFO: This is the Screen-Prototype for PTB 1.0.7, intended as
update for Psychtoolbox 1.0.6
PTB-INFO: Implementation details may change in the final release for
Psychtoolbox 1.0.7 - Use at your own Risk!
OpenGL-Extensions are: GL_WIN_swap_hint GL_EXT_bgra
GL_EXT_paletted_texture
PTB-WARNING: Couldn't even collect one single valid flip interval
sample! Sanity range checks failed!
PTB-WARNING: Couldn't even collect one single valid flip interval
sample! Sanity range checks failed!
PTB-WARNING: Couldn't even collect one single valid flip interval
sample! Sanity range checks failed!
PTB-INFO: OpenGL-Renderer is Microsoft Corporation :: GDI Generic ::
1.1.0
PTB-Info: VBL startline = 768 , VBL Endline = -1
PTB-Info: Measured monitor refresh interval from VBLsync = 0.000000
ms [1.#INF00 Hz]. (0 valid samples taken, stddev=10000000.000000 ms.)
PTB-Info: Reported monitor refresh interval from operating system =
13.333333 ms [75.000000 Hz].
PTB-Info: Small deviations between reported values are normal and no
reason to worry.
PTB-WARNING: Your graphics hardware & driver doesn't support OpenGL
rectangle textures.
PTB-WARNING: This won't affect the correctness or visual accuracy of
image drawing, but it can significantly
PTB-WARNING: degrade performance/speed and increase memory
consumption of images by up to a factor of 4!
PTB-WARNING: If you use a lot of image stimuli (DrawTexture,
Offscreen windows, Stereo display, Quicktime movies)
PTB-WARNING: and you are unhappy with the performance, then please
upgrade your graphics driver and possibly
PTB-WARNING: your gfx hardware if you need higher performance...
WARNING: Couldn't compute a reliable estimate of monitor refresh
interval! Trouble with VBL syncing?!?
WARNING: Mismatch between measured monitor refresh interval and
interval reported by operating system.
This indicates massive problems with VBL sync.
WARNING: Measured monitor refresh interval indicates a display
refresh of less than 25 Hz or more than 250 Hz?!?
This indicates massive problems with VBL sync.
----- ! PTB - ERROR: SYNCHRONIZATION FAILURE ! ----
One or more internal checks (see Warnings above) indicate that
synchronization
of Psychtoolbox to the vertical retrace (VBL) is screwed up for your
setup.
This would have the following bad effects:
- Screen('Flip') not synchronizing to the VBL -> Flicker & tearing
artifacts, messed up stimulus onset and offset timing.
- Wrong stimulus presentation timing and/or wrong synchronization of
Matlab to the VBL.
- Inaccurate or completely wrong timestamps (VBLTimestamp,
StimulusOnsetTime, FlipTimestamp) for stimulus timing reported by
Flip
- Inaccurate or completely wrong rasterbeam positions and monitor
refresh intervals reported by Screen('Flip') and Screen('Framerate')
Please try the following measures in the given order to solve or
work-around the problem:
1. Make sure that your machine is not running other demanding
software in parallel and then retry.
2. If you use a dual/multi-display setup, please put all displays in
mirror-mode with same resolution and color depth,
but different monitor refresh interval (set stimulus display to
higher refresh rate).
3. If it doesn't help or is not possible, try to change assignment
of the primary- and secondary display in the Display
Preference settings of MacOS-X.
4. On desktops or tower machines with two external display
connectors, *PHYSICALLY* swap the connections, aka
which display is plugged into which video-out socket at the back-
side of your computer.
5. If that fails or is not possible on dual- or multi-display
setups, disconnect or disable all displays except
the one for stimulus presentation to the subject.
If everything else fails, please report your problem including all
these messages and information on your specific
setup (Type of graphics card and connected displays, output
of 'DescribeComputer') to the Psychtoolbox forum.
-> You may have found a bug in Psychtoolbox, MacOS-X or your
graphics-hardware.
ans =
0
Thanks, Oren