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Failed to find a suitable OpenCL device, falling back to CPU lightmapper.

Discussion in 'Global Illumination' started by JackReivaj, Jul 11, 2021.

  1. JackReivaj

    JackReivaj

    Joined:
    Feb 7, 2021
    Posts:
    33
    Hi! I'm having this troubles:
    "Opencl device NVIDIA GeForce GTX 1060 3GB from nvidia corporation has less tan 4gb of global memory, ignoring device for lightmapping.
    Failed to find a suitable OpenCL device for the GPU Lightmapper, falling back to CPU lightmapper. Please install the latest graphics driver."
    I don't know what it means. I can't use GPU because the graphic card isn't too good? Is this a problem? How does it affect me?
     
    JackReivaj, Jul 11, 2021
    #1

  2. kristijonas_unity

    kristijonas_unity

    Unity Technologies

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    Feb 8, 2018
    Posts:
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    Hey! At the moment, minimum spec for the GPU lightmapper is 4GB of VRAM. Your GPU has 3GBs, which is below the minimum spec. That's why you are running into issues.
     
    kristijonas_unity, Jul 12, 2021
    #2
    JamesArndt and JackReivaj like this.

  3. UnityLighting

    UnityLighting

    Joined:
    Mar 31, 2015
    Posts:
    3,876
    Has this problem been fixed in newer versions? Can we use graphics with 2 GB of memory?

    • GI: The Unity Editor no longer returns erroneous error messages about GPU driver issues when the user's GPU does not have enough memory to support the GPU Lightmapper. (1289660)
     
    UnityLighting, Jul 17, 2021
    #3

  4. kristijonas_unity

    kristijonas_unity

    Unity Technologies

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    You cannot at the moment. The minimum spec is still 4 GBs of VRAM. We might revisit this in the future, once all lightmap tiling work has been completed.
     
    kristijonas_unity, Jul 20, 2021
    #4
    UnityLighting likes this.

  5. wilkens

    wilkens

    Joined:
    Feb 3, 2014
    Posts:
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    I am using 4GB GTX980 on Arch linux. all nvidia and GPGPU packages are installed, still no luck. Same error here
    "Failed to find a suitable OpenCL device for the GPU Lightmapper, falling back to CPU lightmapper. Please install the latest graphics driver"
     
    wilkens, Jan 25, 2022
    #5
    jiaozi158 likes this.

  6. kristijonas_unity

    kristijonas_unity

    Unity Technologies

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    Which Unity editor version are you on? Try updating to the latest stable release.
     
    kristijonas_unity, Jan 25, 2022
    #6

  7. KEngelstoft

    KEngelstoft

    Unity Technologies

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    Aug 13, 2013
    Posts:
    1,366
    One of the following packages might do the trick. It sounds like you are missing the OpenCL driver.
    sudo apt install clinfo ocl-icd-opencl-dev opencl-headers
     
    KEngelstoft, Jan 26, 2022
    #7
    giorgos_unity likes this.

  8. KingsGames

    KingsGames

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    Feb 16, 2021
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    Try to download latest unity version:)
     
    KingsGames, Mar 8, 2022
    #8

  9. ZeroFlame

    ZeroFlame

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    Feb 23, 2017
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    I hope you guys don't forget about this.
     
    ZeroFlame, May 12, 2022
    #9
    KoenKruk likes this.

  10. KoenKruk

    KoenKruk

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    Apr 23, 2020
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    Me too. I have this issue and I can't really do anything about it, other than buy new stuff. >:|
     
    KoenKruk, Sep 18, 2022
    #10

  11. timmccune

    timmccune

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    Sep 27, 2018
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    I am getting this warning as well but on a laptop with a RTX 2060 GPU which CPU-Z reports having 6GB ram.
     
    timmccune, Oct 10, 2022
    #11

  12. SyahStardust

    SyahStardust

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    Aug 1, 2018
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    I was running the lightmapper just fine on an RTX 2070 max Q for days on Linux, with Unity 2021.3.17.
    This mornning I tried to use the Filtering option - switched from Auto to Advanced. It said the OPTIX option was not available because of the current hardware. I switched it to OpenImageDenoise and generated the lightmaps.

    But now it's always reverting back to CPU, and telling me in the console that it can't find a proper GPU.
    • I have reverted all the settings back in the Lightmapper.
    • I tried restarting and upgraded to 2021.3.21, with no success.
    • I tried deleting the lighting settings and started from scratch. no success.
    What am I missing here?

    UPDATE 03/30/2023:

    It is a bug with Unity.

    Clearing the GI cache, and restarting Linux gets the GPU working with the Lightmapper again. I will look into hanging processes instead of restarting Linux when this happens again and post an update as needed.

    UPDATE 04/01/2023:

    Found it.

    The Lightmapper stops working when I suspend the laptop. I think this has been the case all along, hence why it all works fine after restarting Ubuntu.
     
    Last edited: Apr 1, 2023
    SyahStardust, Mar 29, 2023
    #12

  13. Pema-Malling

    Pema-Malling

    Unity Technologies

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    Hmm. Could be a driver issue or bug with OpenCL. I believe some laptops with dedicated NVidia GPUs, especially on Linux, have behavior that conditionally enables or disables the dedicated GPU in favor of the iGPU. Perhaps suspension is messing with that. The word Optimus and the command `optirun` spring to mind. https://www.nvidia.com/en-us/geforce/technologies/optimus/technology/ perhaps worth looking into?
     
    Pema-Malling, Apr 4, 2023
    #13

  14. Grinchi

    Grinchi

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    Apr 19, 2014
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    130
    Having this kind of problem with Unity 2021 and RX GPUs for a long time. idk why but latest drivers and unity are not friends any more :(
     
    Grinchi, May 1, 2023
    #14