Home » LPI » 117-201 » What command will make lspci show which IRQ the card is actually using as seen by the PCI bus instead of as seen by the kernel?
While installing a new Ethernet card you notice ifconfig is showing an odd IRQ for the device. What command will make lspci show which IRQ the card is actually using as seen by the PCI bus instead of as seen by the kernel?
A. lspci -v -v
B. lspci -v -M
C. lspci -v -b
D. lspci -vM
E. lspci -m -v
Correct Answer: C
Explanation/Reference:
Explanation: Lspci is a utility for displaying information about all PCI buses in the system and all devices connected to them. The -v option tells lspci to be verbose and display detailed information about all devices. The -b option is for bus-centric view. Show all IRQ numbers and addresses as seen by the cards on the PCI bus instead of as seen by the kernel.
Reference: http://ccrma-www.stanford.edu/planetccrma/man/man8/lspci.8.html
Incorrect Answers
A:You can’t specify the same option twice (-v -v).
B:The -M option invokes bus mapping mode which scans the bus extensively to find all devices including those behind misconfigured bridges etc.
D:The options should be separated by hyphens (-). Furthermore, M is the wrong option.
E:The -m option is used to dump PCI device data in machine readable form for easy parsing by scripts.
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