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Question Opening UnityHub with prime-run nvidia GPU

Discussion in 'Linux' started by positive-season, Feb 22, 2023.

  1. positive-season


    Oct 17, 2021
    Hey Linux Users!

    Hopefully an easy solution (fingers crossed).

    I've recently installed KDE Neon 5.26 (upgraded to 5.27 though happened before the upgrade too), installed UnityHub via: (Debian / Ubuntu): and then created my own .desktop file which runs Exec=prime-run unityhub
    (prime-run is a way to specifically open a program using the Nvidia GPU, contents of prime-run is:
    export __GLX_VENDOR_LIBRARY_NAME=nvidia
    export __VK_LAYER_NV_optimus=NVIDIA_only
    export VK_ICD_FILENAMES=/usr/share/vulkan/icd.d/nvidia_icd.json
    exec "$@"

    I can see that my Nvidia GPU is being utilised through nvtop which shows a graphical graph of the utilisation going up (plus using nvidia-settings, same thing)

    This all works correctly and opens Unity Hub (3.4.1), then I can use the Unity Editor (2021.3.18f1 : OpenGL). However the bug that I've seen is:
    If I click on items within the Hierarchy view, after 2-3 clicks, the Inspector (right hand side) seems to lag behind one item. So as an example:
    I click item1, it displays item1 in Inspector,
    I click item2, it displays item2 in Inspector,
    I click item3, it still displays item2 in the Inspector,
    I click item4, it displays item3 in the Inspector,
    I click item5, it displays item4 in the Inspector.

    [edit: this isn't just limited to the whole Inspector refresh, I've also noticed with variable changes within a [SerializeField], but because of this, I can't tell you 100% if it's the game tab that doesn't update properly (say if I edited the speed of an object), or if the Inspector didn't update it from a GUI point of view, an example of this if I change the speed from 20 => 200, the speed doesn't seem to update within the Game tab, until I change the variable again 200 => 2000, then it changes the speed to 200, but if I change the speed again 2000 => 20, the Game tab looks like the object is moving at 2000.]

    Once in a while it will catch up with itself, but most of the time, this happens frequently, and I've been unable to figure out why.

    However I have managed to pin point it it's either to do with prime-run or the Nvidia GPU (Driver 525 - has also been tested and same scenario on Nvidia 515) because when I run Unity Hub without prime-run, it's fine.
    However then I won't be utilising the Nvidia GPU if I need it (luckily in this scenario, I'm not that fussed because the game I'm creating is lightweight, but I'm concerned about when I create bigger projects such as an MMORPG (which is on my TODO to carry on :-D )).

    This isn't a high priority, and it may be that I'm doing something wrong and causing this bug myself, if that's the case, please don't hesitate to let me know, it's all a learning experience!

    P.S I'm using X11 X.Org version:

    Thanks for reading!