# \#linux **URL:** https://psychtoolbox.discourse.group/tag/linux/8.md [Latest](https://psychtoolbox.discourse.group/latest.md) · [Categories](https://psychtoolbox.discourse.group/categories.md) · [Tags](https://psychtoolbox.discourse.group/tags.md) --- ## [Recommended install on Linux? Neurodebian cannot handle licenses, libLexActivator missing](https://psychtoolbox.discourse.group/t/recommended-install-on-linux-neurodebian-cannot-handle-licenses-liblexactivator-missing/5815)
**Author:** [@uliwannek](https://psychtoolbox.discourse.group/u/uliwannek)\ **Replies:** 2\ **Last updated:** [October 1, 2026, 5:12pm UTC](https://psychtoolbox.discourse.group/t/recommended-install-on-linux-neurodebian-cannot-handle-licenses-liblexactivator-missing/5815 "2026-10-01T17:12:48Z")
Background: Debian Trixie (13.7), PsychToolbox (3.0.22.3 from neurodebian), license available. install: apt-get install matlab-psychtoolbox-3 fetches matlab-psychtoolbox-3 matlab-psychtoolbox-3-nonfree starting ptb3… --- ## [Compatibility of PsychToolbox DAQ functions with USB-200 series on Linux System](https://psychtoolbox.discourse.group/t/compatibility-of-psychtoolbox-daq-functions-with-usb-200-series-on-linux-system/5818)
**Author:** [@kchetnik](https://psychtoolbox.discourse.group/u/kchetnik)\ **Replies:** 0\ **Last updated:** [September 29, 2026, 9:30pm UTC](https://psychtoolbox.discourse.group/t/compatibility-of-psychtoolbox-daq-functions-with-usb-200-series-on-linux-system/5818 "2026-09-29T21:30:51Z")
I am trying to determine if a Measurement Computing Corporation (MCC) USB-200 series DAQ is compatible with Psychtoolbox out-of-the-box on Linux Ubuntu 22.04. Our lab is essentially trying to integrate another lab’s syst… --- ## [Visual synchronization error with Nvidia GeForce GTX 1070 and Ubuntu 24.04-LTS](https://psychtoolbox.discourse.group/t/visual-synchronization-error-with-nvidia-geforce-gtx-1070-and-ubuntu-24-04-lts/5817)
**Author:** [@till\_schneider](https://psychtoolbox.discourse.group/u/till_schneider)\ **Replies:** 1\ **Last updated:** [September 29, 2026, 4:44pm UTC](https://psychtoolbox.discourse.group/t/visual-synchronization-error-with-nvidia-geforce-gtx-1070-and-ubuntu-24-04-lts/5817 "2026-09-29T16:44:04Z")
Dear Mario, when running VBLSyncTest, I receive synchronization errors with a GeForce GTX 1070 under Ubuntu 24.04-LTS with the latest PTB Version 3.0.22.3 installed. I used the XOrgConfCreator to setup two displays. How… --- ## [Visual synchronization error using an AMD Radeon RX 9070 XT card with Ubuntu 24.04 LTS](https://psychtoolbox.discourse.group/t/visual-synchronization-error-using-an-amd-radeon-rx-9070-xt-card-with-ubuntu-24-04-lts/5812)
**Author:** [@till\_schneider](https://psychtoolbox.discourse.group/u/till_schneider)\ **Replies:** 3\ **Last updated:** [September 19, 2026, 3:02am UTC](https://psychtoolbox.discourse.group/t/visual-synchronization-error-using-an-amd-radeon-rx-9070-xt-card-with-ubuntu-24-04-lts/5812 "2026-09-19T03:02:09Z")
Dear PTB Team, We have the latest licensed PTB Version (3.0.22.3) installed on Ubuntu 24.04.4 LTS with Matlab 2025b. The CPU is a AMD Ryzen 9 9950X x 32 and the graphics card is a AMD Radeon RX 9070 XT. Nevertheless, … --- ## [Not using pageflips on recent AMD RDNA 4 gpu's on Ubuntu 24.04, Debian 13](https://psychtoolbox.discourse.group/t/not-using-pageflips-on-recent-amd-rdna-4-gpus-on-ubuntu-24-04-debian-13/5806)
**Author:** [@uwtuebingen](https://psychtoolbox.discourse.group/u/uwtuebingen)\ **Replies:** 6\ **Last updated:** [June 11, 2026, 6:16pm UTC](https://psychtoolbox.discourse.group/t/not-using-pageflips-on-recent-amd-rdna-4-gpus-on-ubuntu-24-04-debian-13/5806 "2026-06-11T18:16:34Z")
Disclaimer Yes, I am willing to contribute by testing with the new hardware. Yes, I am willing to use the payed support if needed. We do have payed licenses. Describe the bug New computer with new GPU “Navi RX 9060 … --- ## [Windows 11 Compatibility - requesting a statement to show IT](https://psychtoolbox.discourse.group/t/windows-11-compatibility-requesting-a-statement-to-show-it/5794)
**Author:** [@Dagmar](https://psychtoolbox.discourse.group/u/Dagmar)\ **Replies:** 3\ **Last updated:** [March 4, 2026, 4:29am UTC](https://psychtoolbox.discourse.group/t/windows-11-compatibility-requesting-a-statement-to-show-it/5794 "2026-03-04T04:29:51Z")
Hey Mario! We have been trying to request Windows 10 LTSC Edition from our Central IT as a back up for our upcoming fleet of Ubuntu machines - this will enable legacy paradigm to run without tweaking - and sidesteps the… --- ## [Compatibility Issues Between PTB and MATLAB Versions](https://psychtoolbox.discourse.group/t/compatibility-issues-between-ptb-and-matlab-versions/5775)
**Author:** [@ziyuan](https://psychtoolbox.discourse.group/u/ziyuan)\ **Replies:** 1\ **Last updated:** [December 12, 2025, 4:00pm UTC](https://psychtoolbox.discourse.group/t/compatibility-issues-between-ptb-and-matlab-versions/5775 "2025-12-12T16:00:59Z")
Hello everyone in the community! I’m posting this request for help on behalf of a colleague—since he’s new to the community, his account is restricted from posting directly. Recently, they’ve been trying to install PTB… --- ## [Ac\_compute\_device\_uuid's output is based on invalid pci bus info](https://psychtoolbox.discourse.group/t/ac-compute-device-uuids-output-is-based-on-invalid-pci-bus-info/5772)
**Author:** [@widmann](https://psychtoolbox.discourse.group/u/widmann)\ **Replies:** 2\ **Last updated:** [December 11, 2025, 6:40pm UTC](https://psychtoolbox.discourse.group/t/ac-compute-device-uuids-output-is-based-on-invalid-pci-bus-info/5772 "2025-12-11T18:40:13Z")
We have a low priority, mainly cosmetic issue: Screen(‘GetWindowInfo’, window) prints a message ac\_compute\_device\_uuid’s output is based on invalid pci bus info to the Octave console (we do not perceive any other obvi… --- ## [Problems installing PTB on Linux](https://psychtoolbox.discourse.group/t/problems-installing-ptb-on-linux/5759)
**Author:** [@theprof07](https://psychtoolbox.discourse.group/u/theprof07)\ **Replies:** 19\ **Last updated:** [November 13, 2025, 1:35am UTC](https://psychtoolbox.discourse.group/t/problems-installing-ptb-on-linux/5759 "2025-11-13T01:35:15Z")
The NeuroDebian site is not working so I cannot install PsychToolbox. The line “After selecting a release the setup code will be shown here.” is not being replaced with the needed commands after selecting the OS release… --- ## [Joystick driver](https://psychtoolbox.discourse.group/t/joystick-driver/5237)
**Author:** [@gopie](https://psychtoolbox.discourse.group/u/gopie)\ **Replies:** 3\ **Last updated:** [October 27, 2025, 5:30am UTC](https://psychtoolbox.discourse.group/t/joystick-driver/5237 "2025-10-27T05:30:15Z")
Hi All, I’m attempting to install the joystick driver on a 22.04 version of linux that has the hwe installed. However, running the command provided in the instructions (sudo apt install xserver-xorg-input-joystick-hwe-2… --- ## [Visual Stimuli Off by Factor of Refresh Rate](https://psychtoolbox.discourse.group/t/visual-stimuli-off-by-factor-of-refresh-rate/5763)
**Author:** [@123](https://psychtoolbox.discourse.group/u/123)\ **Replies:** 1\ **Last updated:** [October 21, 2025, 5:53pm UTC](https://psychtoolbox.discourse.group/t/visual-stimuli-off-by-factor-of-refresh-rate/5763 "2025-10-21T17:53:22Z")
Linux - Ubuntu 24.04.3 Kernel Version: 6.8.0-85-generic System: OptiPlex 7090 (0A52) Processor: Intel Core i9-10900 GPU: Advanced Micro Devices, Inc. \[AMD/ATI\] Lexa \[Radeon 540X/550X/630 / RX 640 / E9171 MCM\] GNU Oc… --- ## [Specify a movie fps different from what is in .mov file](https://psychtoolbox.discourse.group/t/specify-a-movie-fps-different-from-what-is-in-mov-file/5761)
**Author:** [@saumil](https://psychtoolbox.discourse.group/u/saumil)\ **Replies:** 1\ **Last updated:** [September 29, 2025, 11:45pm UTC](https://psychtoolbox.discourse.group/t/specify-a-movie-fps-different-from-what-is-in-mov-file/5761 "2025-09-29T23:45:16Z")
Hi, We are trying to play a series of movies with different fps (e.g. about 24, 25, 30, 60; fps are not exact and have decimal digits, e.g. 29.037) continuously. We are using Psychtoolbox-3 on Linux machine with a Nvidia… --- ## [License management on air-gapped devices](https://psychtoolbox.discourse.group/t/license-management-on-air-gapped-devices/5750)
**Author:** [@hakam.nkassis](https://psychtoolbox.discourse.group/u/hakam.nkassis)\ **Replies:** 2\ **Last updated:** [August 7, 2025, 7:00am UTC](https://psychtoolbox.discourse.group/t/license-management-on-air-gapped-devices/5750 "2025-08-07T07:00:58Z")
3.0.22 - Flavor: Manual Install ———- Windows 11 Hi all, I have a PTB license for multiple devices, one of which is an air-gapped lab PC. The PC has to stay offline for data security reasons. Is there anyway to activate… --- ## [Trigger generation issue](https://psychtoolbox.discourse.group/t/trigger-generation-issue/5491)
**Author:** [@bono.kat](https://psychtoolbox.discourse.group/u/bono.kat)\ **Replies:** 2\ **Last updated:** [August 6, 2025, 2:04am UTC](https://psychtoolbox.discourse.group/t/trigger-generation-issue/5491 "2025-08-06T02:04:49Z")
Dear Community, Info: Psychtoolbox-3 (3.0.19) MATLAB platform (2021b) ubuntu (22.04) I have a very broad question. I am running my experiment and pass the triggers on EEG. However, sometimes random triggers are miss… --- ## [Serial port interface code -- a performance comparison](https://psychtoolbox.discourse.group/t/serial-port-interface-code-a-performance-comparison/3781)
**Author:** [@Ian-Max-Andolina](https://psychtoolbox.discourse.group/u/Ian-Max-Andolina)\ **Replies:** 20\ **Last updated:** [July 1, 2025, 6:59pm UTC](https://psychtoolbox.discourse.group/t/serial-port-interface-code-a-performance-comparison/3781 "2025-07-01T18:59:43Z")
MATLAB has a fairly new (R2019B+) serial port interface, Serialport. Some of my arduino control code had previously used the serial command that MATLAB has now deprecated. So I was curious to compare the old and new inte… --- ## ["Invalid movie handle provided" error message](https://psychtoolbox.discourse.group/t/invalid-movie-handle-provided-error-message/5719)
**Author:** [@inichoson](https://psychtoolbox.discourse.group/u/inichoson)\ **Replies:** 2\ **Last updated:** [June 12, 2025, 11:55pm UTC](https://psychtoolbox.discourse.group/t/invalid-movie-handle-provided-error-message/5719 "2025-06-12T23:55:05Z")
I have a script that just plays videos back to back based off of the “Play Movies Without Gaps” script in PTB’s Movie Demos. I am having a weird issue though where the script consistently picks one movie iteration to qui… --- ## [How to use OBS to screen record a third monitor in a multi-display setup on Linux/Ubuntu?](https://psychtoolbox.discourse.group/t/how-to-use-obs-to-screen-record-a-third-monitor-in-a-multi-display-setup-on-linux-ubuntu/5721)
**Author:** [@autopoiesis](https://psychtoolbox.discourse.group/u/autopoiesis)\ **Replies:** 2\ **Last updated:** [June 8, 2025, 11:35am UTC](https://psychtoolbox.discourse.group/t/how-to-use-obs-to-screen-record-a-third-monitor-in-a-multi-display-setup-on-linux-ubuntu/5721 "2025-06-08T11:35:29Z")
I need to run OBS to screen record one of three monitors (the primary stimulus presentation monitor). However, after configuring the screens via XOrgConf in Matlab, the two additional monitors are now blacked out (with a… --- ## [Absolute scaling of texture values for HDR (BT2100) videos](https://psychtoolbox.discourse.group/t/absolute-scaling-of-texture-values-for-hdr-bt2100-videos/5722)
**Author:** [@mantiuk](https://psychtoolbox.discourse.group/u/mantiuk)\ **Replies:** 2\ **Last updated:** [June 6, 2025, 2:17pm UTC](https://psychtoolbox.discourse.group/t/absolute-scaling-of-texture-values-for-hdr-bt2100-videos/5722 "2025-06-06T14:17:56Z")
When reading frames from HDR video files (BT2100), the values in the textures seem to be in linear RGB BT.2020 colorspace, but absolute scaling of those values differs depending on how the corresponding Psychtoolbox wind… --- ## [Failed to choose the 12-bit precision window on AMD graphics card](https://psychtoolbox.discourse.group/t/failed-to-choose-the-12-bit-precision-window-on-amd-graphics-card/5699)
**Author:** [@ziyuan](https://psychtoolbox.discourse.group/u/ziyuan)\ **Replies:** 20\ **Last updated:** [May 28, 2025, 3:57pm UTC](https://psychtoolbox.discourse.group/t/failed-to-choose-the-12-bit-precision-window-on-amd-graphics-card/5699 "2025-05-28T15:57:13Z")
hi community and team, I encountered problems while setting up Psychtoolbox to achieve a precision of 12 bits. My configuration is as follows: OS: Ubuntu 22.04.5 LTS; GPU: AMD® Radeon pro w7600; Matlab: R2024b; I in… --- ## [Anyone used RTX 4060 with movie playback?](https://psychtoolbox.discourse.group/t/anyone-used-rtx-4060-with-movie-playback/5709)
**Author:** [@saumil](https://psychtoolbox.discourse.group/u/saumil)\ **Replies:** 1\ **Last updated:** [May 16, 2025, 9:57pm UTC](https://psychtoolbox.discourse.group/t/anyone-used-rtx-4060-with-movie-playback/5709 "2025-05-16T21:57:17Z")
Hi, Was wondering if RTX4060 works well with 4K movie playback using latest version of psychtoolbox ? Thanks, Best, Saumil --- ## [Unable to set multi-screen (2 and more screens)](https://psychtoolbox.discourse.group/t/unable-to-set-multi-screen-2-and-more-screens/5696)
**Author:** [@ziyuan](https://psychtoolbox.discourse.group/u/ziyuan)\ **Replies:** 3\ **Last updated:** [May 9, 2025, 2:42pm UTC](https://psychtoolbox.discourse.group/t/unable-to-set-multi-screen-2-and-more-screens/5696 "2025-05-09T14:42:07Z")
Hi PTB community and team, I am trying to set up psychtoolbox to generate the 12bit precision stimuli for detecting the detection threshold. in order to get the 12bit precision, our lab follow the Document on Psychtoolbo… --- ## [LabJack on linux to read in inputs/triggers for screen flips in matlab](https://psychtoolbox.discourse.group/t/labjack-on-linux-to-read-in-inputs-triggers-for-screen-flips-in-matlab/5650)
**Author:** [@adeeti](https://psychtoolbox.discourse.group/u/adeeti)\ **Replies:** 6\ **Last updated:** [April 7, 2025, 7:42pm UTC](https://psychtoolbox.discourse.group/t/labjack-on-linux-to-read-in-inputs-triggers-for-screen-flips-in-matlab/5650 "2025-04-07T19:42:20Z")
Hi PTB community! I have a PTB3 installed on my ubuntu 22.04 laptop and have been using a labjack U3 for quite reliable TTL outputs for screen flips using the linux exodriver and following function: I would also like… --- ## [Unable to display image on external monitor AMD laptop](https://psychtoolbox.discourse.group/t/unable-to-display-image-on-external-monitor-amd-laptop/5486)
**Author:** [@adeeti](https://psychtoolbox.discourse.group/u/adeeti)\ **Replies:** 8\ **Last updated:** [April 1, 2025, 5:59pm UTC](https://psychtoolbox.discourse.group/t/unable-to-display-image-on-external-monitor-amd-laptop/5486 "2025-04-01T17:59:59Z")
Authentication token: ANY4B-UP-2024827113311:2b28a796aa78935b57eba267c343dc7e405314cf628162f42acbd1aed89a1752 Hi PTB community and team, I am trying to set up psychtoolbox to display visual stimuli to mice for electroph… --- ## [PsychPortAudio freezes after first sound](https://psychtoolbox.discourse.group/t/psychportaudio-freezes-after-first-sound/5639)
**Author:** [@baptiste](https://psychtoolbox.discourse.group/u/baptiste)\ **Replies:** 3\ **Last updated:** [February 11, 2025, 9:36pm UTC](https://psychtoolbox.discourse.group/t/psychportaudio-freezes-after-first-sound/5639 "2025-02-11T21:36:05Z")
Hello. I experience an issue with PsychPortAudio on Ubuntu 22.04.4 LTS. I use the PTB 3.0.19.64715640, and PsychPortAudio 3.0.19.64657228. When running an experiment that used to work fine on another system, PsychPortA… --- ## [Interference when using two mice](https://psychtoolbox.discourse.group/t/interference-when-using-two-mice/5638)
**Author:** [@CSchranz](https://psychtoolbox.discourse.group/u/CSchranz)\ **Replies:** 4\ **Last updated:** [February 7, 2025, 11:07am UTC](https://psychtoolbox.discourse.group/t/interference-when-using-two-mice/5638 "2025-02-07T11:07:17Z")
Hello, I am trying two read the input of two mice from two screen in Ubuntu 20.4 in Matlab 2024a with Psychtoolbox 3.0.19.14. I am using this to let two participants that each have a mouse and a screen to rate and expe… --- ## [Running Tobii Pro Eye Tracker on Linux - possible xorg file conflict?](https://psychtoolbox.discourse.group/t/running-tobii-pro-eye-tracker-on-linux-possible-xorg-file-conflict/5612)
**Author:** [@DeborahA](https://psychtoolbox.discourse.group/u/DeborahA)\ **Replies:** 32\ **Last updated:** [January 17, 2025, 6:26pm UTC](https://psychtoolbox.discourse.group/t/running-tobii-pro-eye-tracker-on-linux-possible-xorg-file-conflict/5612 "2025-01-17T18:26:57Z")
NJU739EE- 2022520114942:01f960c54c9ad357c32d17714aaa8fa8ea0a07f592d5cd5afa54092162e72bb3 Hi all, I have recently purchased a Tobii Pro Spectrum eye tracker and am trying to set it up to run on my Ubuntu 22.04 setup (Ub… --- ## [Inconsistent timing of stimulus event code and photosensor](https://psychtoolbox.discourse.group/t/inconsistent-timing-of-stimulus-event-code-and-photosensor/5593)
**Author:** [@engell](https://psychtoolbox.discourse.group/u/engell)\ **Replies:** 10\ **Last updated:** [December 30, 2024, 11:14pm UTC](https://psychtoolbox.discourse.group/t/inconsistent-timing-of-stimulus-event-code-and-photosensor/5593 "2024-12-30T23:14:46Z")
PTB: 3.0.19 Matlab R2022a Linux Ubuntu 20.04 Stim timing issue: event code sometimes precedes visual stimulus, sometimes follows it. Hello, I was hoping someone might have some helpful insight regarding a timing iss… --- ## [Solved: Invalid MEX file ubuntu 24.04 -\> Run PsychLinuxConfiguration](https://psychtoolbox.discourse.group/t/solved-invalid-mex-file-ubuntu-24-04-run-psychlinuxconfiguration/5601)
**Author:** [@jkawa](https://psychtoolbox.discourse.group/u/jkawa)\ **Replies:** 1\ **Last updated:** [December 21, 2024, 1:53pm UTC](https://psychtoolbox.discourse.group/t/solved-invalid-mex-file-ubuntu-24-04-run-psychlinuxconfiguration/5601 "2024-12-21T13:53:35Z")
Hi, I have the following problem of invalid MEX file ‘/usr/share/psychtoolbox-3/PsychBasic/moglcore.mexa64’: libglut.so.3: cannot open shared object file: No such file or directory, when running VBLSyncTest with pscht… --- ## [Vulkan breaks with \*\*\* stack smashing detected \*\*\*: terminated](https://psychtoolbox.discourse.group/t/vulkan-breaks-with-stack-smashing-detected-terminated/5501)
**Author:** [@HeikoSchutt](https://psychtoolbox.discourse.group/u/HeikoSchutt)\ **Replies:** 14\ **Last updated:** [November 8, 2024, 3:49am UTC](https://psychtoolbox.discourse.group/t/vulkan-breaks-with-stack-smashing-detected-terminated/5501 "2024-11-08T03:49:50Z")
Hi all! We are trying to get Vulkan to run to enable the commercially available HDR10 on our Linux (Ubuntu 24.04 LTS) computer. We got to a point now where Psychtoolbox thinks that our system should enable HDR/vulkan, i… --- ## [Unknown problem playing movies with Gstreamer on Ubuntu Linux](https://psychtoolbox.discourse.group/t/unknown-problem-playing-movies-with-gstreamer-on-ubuntu-linux/4876)
**Author:** [@snoah](https://psychtoolbox.discourse.group/u/snoah)\ **Replies:** 12\ **Last updated:** [November 21, 2024, 7:29pm UTC](https://psychtoolbox.discourse.group/t/unknown-problem-playing-movies-with-gstreamer-on-ubuntu-linux/4876 "2024-11-21T19:29:50Z")
Hello, I’m having problems getting movies to play with Psychtoolbox on my Ubuntu stimulus laptop. The same movie-playing script works fine on a different laptop running a mac operating system. My script is supposed to … [Next page](https://psychtoolbox.discourse.group/tag/linux/8.md?match_all_tags=true&page=1&tags%5B%5D=linux)