slot PCIe detectado pelo dmidecode mas não pelo lspci

Question

Estou usando um computador com quatro slots PCI diferentes. Eu estou usando um dispositivo PCIe x4 lanes em um deles (um slot de x4 pistas), e ele funciona corretamente. No entanto, não consegui fazer funcionar nas pistas x16. Primeiro eu pensei que o sistema operacional não reconheceu o dispositivo, mas agora eu acho que é um problema com o slot PCI por si só: quando eu uso sudo dmidecode | grep "PCI" lista todos os slots PCIe, mas quando eu faço sudo lspci | grep "PCI" mostra apenas 3 dos 3 slots, sem o slot x16 (veja abaixo as saídas). Estou usando o CENTOS 7. Existe alguma maneira de ativar o slot PCIe x16, para que eu possa usá-lo com o meu dispositivo como faço com o slot PCIe x4? Quando eu conecto o dispositivo ao slot x16, ele é bem alimentado (o LED pisca como acontece ao conectar a PCIe x4).

Obrigado!

PS. O dispositivo que eu tento usar é um FPGA powerd by PCIe

$sudo dmidecode | grep "PCI"
        PCI is supported
    Designation: Slot1 / X16PCIEXP
    Type: x16 PCI Express 3 x16
    Designation: Slot2 / X1PCIEXP1
    Type: x1 PCI Express 2 x1
    Designation: Slot3 / X1PCIEXP2
    Type: x1 PCI Express 2 x1
    Designation: Slot4 / X4PCIEXP
    Type: x4 PCI Express 2 x4
HP BIOS iSCSI NIC PCI and MAC Information
    NIC 1: PCI device 01:00.3, MAC address 00:02:01:00:00:00
    NIC 2: PCI device 00:00.2, MAC address 00:00:00:BA:00:03
HP BIOS iSCSI NIC PCI and MAC Information
    NIC 1: PCI device 01:00.3, MAC address 00:02:01:00:00:00
    NIC 2: PCI device 00:00.2, MAC address 0B:00:00:05:00:03
HP BIOS iSCSI NIC PCI and MAC Information
    NIC 1: PCI device 01:01.1, MAC address 00:02:01:00:00:00
    NIC 2: PCI device 03:00.2, MAC address FF:FF:FF:FF:FF:04
    NIC 3: PCI device ff:00.0, MAC address FF:FF:31:00:05:00
    NIC 8: PCI device 0a:00.0, MAC address 00:34:00:00:00:00
HP BIOS iSCSI NIC PCI and MAC Information
    NIC 1: PCI device 01:00.7, MAC address 00:02:01:00:00:00
    NIC 2: PCI device 00:00.2, MAC address 02:01:00:00:00:03
    NIC 3: PCI device 02:00.0, MAC address 01:00:00:00:04:05
    NIC 6: PCI device 07:1f.7, MAC address 00:08:00:FF:FF:FF

$ sudo lspci | grep "PCI"
00:1c.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #6 (rev f1)
00:1c.6 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #7 (rev f1)
00:1d.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #9 (rev f1)

EDIT: saídas de mais comandos:

$ lspci -nm
00:00.0 "0600" "8086" "191f" -r07 "103c" "8053"
00:02.0 "0300" "8086" "1912" -r06 "103c" "8053"
00:14.0 "0c03" "8086" "a12f" -r31 -p30 "103c" "8053"
00:14.2 "1180" "8086" "a131" -r31 "103c" "8053"
00:16.0 "0780" "8086" "a13a" -r31 "103c" "8053"
00:16.3 "0700" "8086" "a13d" -r31 -p02 "103c" "8053"
00:17.0 "0106" "8086" "a102" -r31 -p01 "103c" "8053"
00:1c.0 "0604" "8086" "a115" -rf1 "" ""
00:1c.6 "0604" "8086" "a116" -rf1 "" ""
00:1d.0 "0604" "8086" "a118" -rf1 "" ""
00:1f.0 "0601" "8086" "a146" -r31 "103c" "8053"
00:1f.2 "0580" "8086" "a121" -r31 "103c" "8053"
00:1f.3 "0403" "8086" "a170" -r31 "103c" "8053"
00:1f.4 "0c05" "8086" "a123" -r31 "103c" "8053"
00:1f.6 "0200" "8086" "15b7" -r31 "103c" "8053"


$ lspci -t
-[0000:00]-+-00.0
           +-02.0
           +-14.0
           +-14.2
           +-16.0
           +-16.3
           +-17.0
           +-1c.0-[01]--
           +-1c.6-[02]--
           +-1d.0-[03]--
           +-1f.0
           +-1f.2
           +-1f.3
           +-1f.4
           \-1f.6


$ lspci -nn
00:00.0 Host bridge [0600]: Intel Corporation Skylake Host Bridge/DRAM Registers [8086:191f] (rev 07)
00:02.0 VGA compatible controller [0300]: Intel Corporation HD Graphics 530 [8086:1912] (rev 06)
00:14.0 USB controller [0c03]: Intel Corporation Sunrise Point-H USB 3.0 xHCI Controller [8086:a12f] (rev 31)
00:14.2 Signal processing controller [1180]: Intel Corporation Sunrise Point-H Thermal subsystem [8086:a131] (rev 31)
00:16.0 Communication controller [0780]: Intel Corporation Sunrise Point-H CSME HECI #1 [8086:a13a] (rev 31)
00:16.3 Serial controller [0700]: Intel Corporation Sunrise Point-H KT Redirection [8086:a13d] (rev 31)
00:17.0 SATA controller [0106]: Intel Corporation Sunrise Point-H SATA controller [AHCI mode] [8086:a102] (rev 31)
00:1c.0 PCI bridge [0604]: Intel Corporation Sunrise Point-H PCI Express Root Port #6 [8086:a115] (rev f1)
00:1c.6 PCI bridge [0604]: Intel Corporation Sunrise Point-H PCI Express Root Port #7 [8086:a116] (rev f1)
00:1d.0 PCI bridge [0604]: Intel Corporation Sunrise Point-H PCI Express Root Port #9 [8086:a118] (rev f1)
00:1f.0 ISA bridge [0601]: Intel Corporation Sunrise Point-H LPC Controller [8086:a146] (rev 31)
00:1f.2 Memory controller [0580]: Intel Corporation Sunrise Point-H PMC [8086:a121] (rev 31)
00:1f.3 Audio device [0403]: Intel Corporation Sunrise Point-H HD Audio [8086:a170] (rev 31)
00:1f.4 SMBus [0c05]: Intel Corporation Sunrise Point-H SMBus [8086:a123] (rev 31)
00:1f.6 Ethernet controller [0200]: Intel Corporation Ethernet Connection (2) I219-LM [8086:15b7] (rev 31)
03:00.0 Signal processing controller [1180]: Xilinx Corporation Device [10ee:7024]