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    Nothing shows up in slots, even though I have multiple cards plugged in. I do have a power directory in /sys/bus/pci/devices/$NUMBER/. But nothing seems to warrant setting 0 or 1 Commented Apr 27, 2013 at 23:30
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    I came across this thread on U&L, similar issue: there are some answers to that Q that say you can reset with this: echo "1" > /sys/bus/pci/devices/$NUMBER/reset. Read that Q though, there are conditions around doing it that way! Commented Apr 27, 2013 at 23:42
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    Are you unloading the kernel modules for that card prior to the power cycling? I think you have to do that as well. Commented Apr 28, 2013 at 0:33
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    I think I'll check the kernel source code to see if toggling power actually puts it into D3. Commented Aug 7, 2018 at 0:04
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    'power' should put the card in D3cold by removing power to the card, but support for this at the motherboard level is uncommon. 'reset' issues an FLR to one function and will not change the card power state. Commented Apr 12, 2019 at 22:57