When I upgraded an older Macbook Air (running Ubuntu 18.04.4) from kernel 4.15 to 5.5, the wifi adapter no longer worked. The system was reporting that there were no wifi adapters found.
I did research, tried some of the suggested changes (mostly installing the DEB package with the Broadcom kernel source) and had no luck getting wifi to work.
Installed kernel 5.3.18 and the wifi adapter is found and is working.
cat /proc/version_signature returns 'no such file'
When I upgraded an older Macbook Air (running Ubuntu 18.04.4) from kernel 4.15 to 5.5, the wifi adapter no longer worked. The system was reporting that there were no wifi adapters found.
I did research, tried some of the suggested changes (mostly installing the DEB package with the Broadcom kernel source) and had no luck getting wifi to work.
Installed kernel 5.3.18 and the wifi adapter is found and is working.
cat /proc/version_ signature returns 'no such file'
lscpi -vnvn returns (for the wifi adapter):
03:00.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM4360 802.11ac Wireless Network Adapter [14e4:43a0] (rev 03) ,D1+,D2+ ,D3hot+ ,D3cold+ ) mpliance- ComplianceSOS- plete-, EqualizationPhase1- nPhase2- , EqualizationPha se3-, LinkEqualizatio nRequest- ff-ff-00- 00-01
Subsystem: Apple Inc. BCM4360 802.11ac Wireless Network Adapter [106b:0117]
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: 256 bytes
Interrupt: pin A routed to IRQ 0
Region 0: Memory at b0600000 (64-bit, non-prefetchable) [size=32K]
Region 2: Memory at b0400000 (64-bit, non-prefetchable) [size=2M]
Capabilities: [48] Power Management version 3
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+
Status: D3 NoSoftRst+ PME-Enable- DSel=0 DScale=2 PME-
Capabilities: [58] MSI: Enable- Count=1/1 Maskable- 64bit+
Address: 0000000000000000 Data: 0000
Capabilities: [68] Vendor Specific Information: Len=44 <?>
Capabilities: [ac] 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 1024 bytes
DevSta: CorrErr- UncorrErr+ FatalErr- UnsuppReq- AuxPwr+ TransPend-
LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s <2us, L1 <32us
ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
LnkCtl: ASPM L0s L1 Enabled; 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 Via WAKE#
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR+, OBFF Disabled
LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-
Transmit Margin: Normal Operating Range, EnterModifiedCo
Compliance De-emphasis: -6dB
LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationCom
Equalizatio
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] Device Serial Number 48-d7-00-
Capabilities: [150 v1] Power Budgeting <?>
Capabilities: [160 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: [1b0 v1] Latency Tolerance Reporting
Max snoop latency: 3145728ns
Max no snoop latency: 3145728ns
Capabilities: [220 v1] #15
Kernel modules: bcma
lsb_release returns:
Description: Ubuntu 18.04.4 LTS
Release: 18.04
apt-cache for the driver kernel source returns:
bcmwl-kernel- source: 271+bdcom- 0ubuntu5 271+bdcom- 0ubuntu5 271+bdcom- 0ubuntu5 100 dpkg/status 30.223. 271+bdcom- 0ubuntu5~ 18.04.1 500 us.archive. ubuntu. com/ubuntu bionic- updates/ restricted amd64 Packages 30.223. 271+bdcom- 0ubuntu4 500 us.archive. ubuntu. com/ubuntu bionic/restricted amd64 Packages
Installed: 6.30.223.
Candidate: 6.30.223.
Version table:
*** 6.30.223.
100 /var/lib/
6.
500 http://
6.
500 http://
What I expected to happen: Wifi connection (and icon showing in status bar)
What happened instead: WiFi adapter not found.