Ubuntu 18.04 not recognize the second port in the dual port network card

Ubuntu Server 18.04 LTS fresh install on HP Proliant ML150 G6 server. NC107i Integrated PCI Express Gigabit Server Adapter on Broadcom NetXtreme BCM5723 Gigabit Ethernet PCIe chip has Dual Port, but only one port has identified by OS.

:~#ifconfig
enp4s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
        inet 172.x.y.z netmask 255.255.255.0 broadcast 172.x.y.255
        inet6 fe80::1ec1:deff:fexx:fxx prefixlen 64 scopeid 0x20<link>
        ether 1c:c1:de:xx:xx:xx txqueuelen 1000 (Ethernet)
        RX packets 121749 bytes 43086012 (43.0 MB)
        RX errors 0 dropped 20992 overruns 0 frame 0
        TX packets 42662 bytes 10473704 (10.4 MB)
        TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
        device interrupt 17

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
        inet 127.0.0.1 netmask 255.0.0.0
        inet6 ::1 prefixlen 128 scopeid 0x10<host>
        loop txqueuelen 1000 (Local Loopback)
        RX packets 656560 bytes 87772499 (87.7 MB)
        RX errors 0 dropped 0 overruns 0 frame 0
        TX packets 656560 bytes 87772499 (87.7 MB)
        TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

:~# lshw -C Network
  *-network
       description: Ethernet interface
       product: NetXtreme BCM5723 Gigabit Ethernet PCIe
       vendor: Broadcom Inc. and subsidiaries
       physical id: 0
       bus info: pci@0000:04:00.0
       logical name: enp4s0
       version: 10
       serial: 1c:c1:de:xx:xx:xx
       size: 1Gbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm vpd msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.137 duplex=full firmware=5723-v3.35, IPMILITE v8.02 ip=172.x.y.z latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
       resources: irq:41 memory:fbbf0000-fbbfffff

:~# lspci -vvnn
04:00.0 Ethernet controller [0200]: Broadcom Inc. and subsidiaries NetXtreme BCM5723 Gigabit Ethernet PCIe [14e4:165b] (rev 10)
        Subsystem: Hewlett-Packard Company NC107i Integrated PCI Express Gigabit Server Adapter [103c:705d]
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR+ FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 41
        Region 0: Memory at fbbf0000 (64-bit, non-prefetchable) [size=64K]
        Capabilities: [48] Power Management version 3
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot+,D3cold+)
                Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=1 PME-
        Capabilities: [40] Vital Product Data
                Product Name: HP NC107i PCIe Gigabit Server Adapter
                Read-only fields:
                        [PN] Part number: BCM95723
                        [EC] Engineering changes: 106679-15
                        [SN] Serial number: 0123456789
                        [MN] Manufacture ID: 31 34 65 34
                        [RV] Reserved: checksum good, 37 byte(s) reserved
                Read/write fields:
                        [YA] Asset tag: XYZ01234567
                        [RW] Read-write area: 107 byte(s) free
                End
        Capabilities: [60] Vendor Specific Information: Len=6c <?>
        Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
                Address: 00000000fee004d8 Data: 0000
        Capabilities: [cc] Express (v2) Endpoint, MSI 00
                DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <4us, L1 unlimited
                        ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset- SlotPowerLimit 10.000W
                DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
                        RlxdOrd- ExtTag+ PhantFunc- AuxPwr- NoSnoop-
                        MaxPayload 128 bytes, MaxReadReq 512 bytes
                DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
                LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s <1us, L1 <64us
                        ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp-
                LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
                DevCap2: Completion Timeout: Range ABCD, TimeoutDis+, LTR-, OBFF Not Supported
                DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled
                LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-
                         Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
                         Compliance De-emphasis: -6dB
                LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete-, EqualizationPhase1-
                         EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
        Capabilities: [100 v1] Advanced Error Reporting
                UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
                UEMsk: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
                UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
                CESta: RxErr+ BadTLP- BadDLLP+ Rollover- Timeout- NonFatalErr-
                CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
                AERCap: First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn-
        Capabilities: [13c v1] Virtual Channel
                Caps: LPEVC=0 RefClk=100ns PATEntryBits=1
                Arb: Fixed- WRR32- WRR64- WRR128-
                Ctrl: ArbSelect=Fixed
                Status: InProgress-
                VC0: Caps: PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
                        Arb: Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
                        Ctrl: Enable+ ID=0 ArbSelect=Fixed TC/VC=ff
                        Status: NegoPending- InProgress-
        Capabilities: [160 v1] Device Serial Number 1c-c1-de-ff-fe-xx-xx-xx
        Capabilities: [16c v1] Power Budgeting <?>
        Kernel driver in use: tg3
        Kernel modules: tg3