Trouble with VBL syncing - PTB - ERROR: SYNCHRONIZATION FAILURE !

I am using psychtoolbox with Matlab 2017a.

I get error at the beginning when initiating the screen.

OS is windows 10, graphic card is Intel® HD Graphics 520 :: 4.4.0 - Build 21.20.16.4627.

From the log file :

PTB-INFO: OpenGL-Renderer is Intel :: Intel(R) HD Graphics 520 :: 4.4.0 - Build 21.20.16.4627
PTB-INFO: VBL startline = 900 , VBL Endline = 1080
PTB-INFO: Measured monitor refresh interval from beamposition = 16.671140 ms [59.983902 Hz].
PTB-INFO: Will use beamposition query for accurate Flip time stamping.
PTB-INFO: Measured monitor refresh interval from VBLsync = 16.624838 ms [60.150963 Hz]. (50 valid samples taken, stddev=0.557785 ms.)
PTB-INFO: Reported monitor refresh interval from operating system = 16.666667 ms [60.000000 Hz].
PTB-INFO: Small deviations between reported values are normal and no reason to worry.
PTB-INFO: ==============================================================================================================================
PTB-INFO: WINDOWS DWM DESKTOP COMPOSITOR IS ACTIVE. On this Windows-10 or later system, Psychtoolbox can no longer reliably detect if
PTB-INFO: this will cause trouble for timing and integrity of visual stimuli or not. You might be just fine, or you could be in trouble.
PTB-INFO: Use external measurement equipment and independent procedures to verify reliability of timing if you care about proper timing.
PTB-INFO: ==============================================================================================================================

WARNING: Couldn't compute a reliable estimate of monitor refresh interval! Trouble with VBL syncing?!?

----- ! PTB - ERROR: SYNCHRONIZATION FAILURE ! ----

One or more internal checks (see Warnings above) indicate that synchronization
of Psychtoolbox to the vertical retrace (VBL) is not working on your setup.

[Walter Roberson]

http://docs.psychtoolbox.org/SyncTrouble

[Sijamini Baskaralingam]

Hey could you find a solution? I have the same problem with Matlab 2020a, Windows 10, Intel UHD graphics 620. And the Synctrouble help was not much of a help

[Walter Roberson]

If I recall correctly, the fix is to change graphics cards so that you are not using an Intel 5xx or Intel 6xx Integrated Graphics card. I do not recall whether the Intel 1000 graphics card was acceptable. My understanding is that the Intel 2000 graphics is advanced enough to work for this purpose.

[Muqing Fan]

I have the similar issues with my Matlab 2020a, Windows 10, Intel ® UHD Graphics 360 and NVIDIA GeForce GTX 1060 with Max-Design. What do you mean by chaning the graphics card...? Do you need to do that in Matlab?

[Walter Roberson]

I referred to a hardware change.

I do not recall whether UHD 360 was a problem; the Intel naming conventions are not obvious to me.

It might be possible to change your bios setting to disable your uhd card.

[Miguel Ángel]

Hi!

I have the same problem but it is even more weird. I run correctly one instance of my code. Then maybe I get an error in the middle of the run and it stops. I clear all varaibles and start the same code again and I get this error first time I call PsychImaging (first time I didn't get error there). I restart Matlab and it works fine (just for the first run).

Any help on this?

Thanks!

[Walter Roberson]

Miguel Ángel : does your code just happen to use GPU ?