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Name: Onboard SAS2308 PCI-Express Fusion-MPT SAS-2
Is this a subsystem?
@AlbertP can you elaborate on the criteria of your question?
The 0x0691 is the id used by Supermicro for their integrated/onboard SAS2308 SAS controllers on some of their motherboards.
PCI devices typically have a vendor & device ID marking the chip and a subvendor & subdevice ID (together called subsystem) marking the board on which that chip is found. As this is a Supermicro ID which is a board manufacturer, I suspect it is a subsystem, not the device ID which ought to be LSI's (1000:xxxx I think).
If indeed a subsystem please look up the relevant LSI device ID, go to that page and add subsystem "15d9 0691" there. If in doubt, you can post a link to the output of lspci -knn (Linux) or to a screenshot of the 'hardware ID' section in the device properties (Windows).
@AlbertP: thanks for the clarification. I'll submit this as sub-system.