# Unable to display image on external monitor AMD laptop

**URL:** <https://psychtoolbox.discourse.group/t/unable-to-display-image-on-external-monitor-amd-laptop/5486>\
**Category:** Programming Help\
**Tags:** linux\
**Created:** [September 13, 2024, 10:49pm UTC](https://psychtoolbox.discourse.group/t/unable-to-display-image-on-external-monitor-amd-laptop/5486 "2024-09-13T22:49:35Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![adeeti](https://avatars.discourse-cdn.com/v4/letter/a/48db29/32.png) [@adeeti](https://psychtoolbox.discourse.group/u/adeeti)\
**Post date:** [September 17, 2024, 11:23pm UTC](https://psychtoolbox.discourse.group/t/unable-to-display-image-on-external-monitor-amd-laptop/5486/5 "2024-09-17T23:23:03Z")

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Thanks so much for your help and pointing me to this article!

I have kept the 3rd party drivers as you noted that they are unlikely to be worse.

I did add PsychTweak(‘GetSecsClock’, 1); to the beginning of my script and now I am getting the following warning that the flip command seems to be missing:

INFO: PTB’s Screen(‘Flip’, 10) command seems to have missed the requested stimulus presentation deadline  
INFO: a total of 19 times out of a total of 209 flips during this session.

INFO: This number is fairly accurate (and indicative of real timing problems in your own code or your system)  
INFO: if you provided requested stimulus onset times with the ‘when’ argument of Screen(‘Flip’, window [, when]);  
INFO: If you called Screen(‘Flip’, window); without the ‘when’ argument, this count is more of a ‘‘mild’’ indicator  
INFO: of timing behaviour than a hard reliable measurement. Large numbers may indicate problems and should at least  
INFO: deserve your closer attention. Cfe. ‘help SyncTrouble’, the FAQ section at [www.psychtoolbox.org](http://www.psychtoolbox.org) and the  
INFO: examples in the PDF presentation in PsychDocumentation/Psychtoolbox3-Slides.pdf for more info and timing tips.

INFO: This number is fairly accurate (and indicative of real timing problems in your own code or your system)  
INFO: if you provided requested stimulus onset times with the ‘when’ argument of Screen(‘Flip’, window [, when]);  
INFO: If you called Screen(‘Flip’, window); without the ‘when’ argument, this count is more of a ‘‘mild’’ indicator  
INFO: of timing behaviour than a hard reliable measurement. Large numbers may indicate problems and should at least  
INFO: deserve your closer attention. Cfe. ‘help SyncTrouble’, the FAQ section at [www.psychtoolbox.org](http://www.psychtoolbox.org) and the  
INFO: examples in the PDF presentation in PsychDocumentation/Psychtoolbox3-Slides.pdf for more info and timing tips.

However, when I comment out the PsychTweak function after closing and opening a new PTB - matlab session (I presume now using the default real clock), I do not get the same error when I close the screen after running 100 test trials. And the flip time before current time does not seem to come consistently.

I do always input a tWhen in my screen flip command and the duration is short - usually less than 1s.

I did try to look into my clock sync status:  
visstim@VisStim01:~$ timedatectl timesync-status  
Server: 185.125.190.57 ([ntp.ubuntu.com](http://ntp.ubuntu.com))  
Poll interval: 34min 8s (min: 32s; max 34min 8s)  
Leap: normal  
Version: 4  
Stratum: 2  
Reference: B7A08584  
Precision: 1us (-25)  
Root distance: 800us (max: 5s)  
Offset: +431us  
Delay: 235.180ms  
Jitter: 134.048ms  
Packet count: 119  
Frequency: -14.143ppm

I am not sure if one of the other clocks would work better?

Thanks for your help, I really appreciate it!

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