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I have a PCIe (ver 2) linux system. I want to find out how many PCIe lanes were negotiated and are being used between my device and the host controller . (I do not know how many lanes my device supports or how many lanes the slot has)

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up vote 10 down vote accepted

lspci -vv should give you this information, look for the "Width" part in the LnkCap section.

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