How to find out PCI version information in linux

Question

How can I find out which PCI version (2.0 , 2.3) are supported by the motherboard - even for slots which do not have any cards connected to them.

lspci -vvv does not seem to show information for PCI slots without cards.

Answer 1

You can try dmidecode. I don't have many servers with standard PCI slots anymore, but the output looks like the following. Information for unpopulated ports is provided:

Handle 0x0901, DMI type 9, 13 bytes
System Slot Information
        Designation: PCI   Slot 1
        Type: 64-bit PCI-X
        Current Usage: Available
        Length: Long
        ID: 1
        Characteristics:
                3.3 V is provided

Handle 0x0902, DMI type 9, 13 bytes
System Slot Information
        Designation: PCI   Slot 2
        Type: 64-bit PCI-X
        Current Usage: In Use
        Length: Long
        ID: 2
        Characteristics:
                3.3 V is provided

Handle 0x0903, DMI type 9, 13 bytes
System Slot Information
        Designation: PCI-E Slot 3
        Type: x4 PCI Express
        Current Usage: Available
        Length: Other
        ID: 3
        Characteristics:
                3.3 V is provided

Handle 0x0904, DMI type 9, 13 bytes
System Slot Information
        Designation: PCI-E Slot 4
        Type: x4 PCI Express
        Current Usage: In Use
        Length: Other
        ID: 4
        Characteristics:
                3.3 V is provided