Why does gpuDeviceCount report 0 in the latest release of MATLAB?

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I have just upgraded to the latest release of MATLAB on a machine with GPUs. But gpuDeviceCount is now returning 0. If I run gpuDeviceCount in my older release of MATLAB I get the correct answer. Why is this happening?

Accepted Answer

MathWorks Support Team
MathWorks Support Team on 21 Mar 2023
gpuDeviceCount and gpuDeviceTable are designed to never error and will report 0, or an empty table, when ​​​​either no GPU is detected or MATLAB is unable to use the GPU.
To diagnose the exact cause please execute:
>> gpuDevice()
This will give an error message with details on why MATLAB cannot access the GPU. The most common fix is to update to the latest graphics drivers for your card.

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