It looks like there may not be an issue with MSI after all.

The nvidia driver is issued an IRQ when first used, not at boot time.
If I run the CUDA "deviceQuery" sample then this appears in dmesg:

[   67.207929] nvidia 0000:00:06.0: irq 29 for MSI/MSI-X
[   67.646207] NVRM: RmInitAdapter failed! (0x24:0x1f:1356)
[ 67.646570] NVRM: rm_init_adapter failed for device bearing minor number 0 [ 67.647214] NVRM: nvidia_frontend_open: minor 0, module->open() failed, error -5

Maybe the IRQ is deallocated immediately so doesn't appear in the output of /proc/interrupts?

I guess I'll need to research the NVRM error above now but at least this thread might be useful regarding the BAR allocation.
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