It turns out the MOK key installed previously was removed during a BIOS
update. Upon the next kernel update from Ubuntu I was prompted to
install the MOK key, after which OpenCL works even when kernel lockdown
is enabled.
** Changed in: nvidia-graphics-drivers-440 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1887249
Title:
OpenCL doesn't work when kernel lockdown enabled
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