Wired connection works on startup, then deactivates

[onepapership]

Hello,

I recently installed Kubuntu 20.04 on my PC in a dual-boot configuration with Windows 10. My wired connection (Broadcom NetXtreme BCM5762) works with no problems under Windows 10. Under Kubuntu, it works on startup, but anywhere from 1-45 minutes in, it deactivates, and there is no visible option to reconnect. I have installed a usb wifi adapter that seems to be stable, but I prefer to use the wired connection on this computer.

I'm including the output of various commands to help diagnose. Please let me know if I should include other information.

lspci:

00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h (Models 10h-1fh) Processor Root Complex
00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Family 15h (Models 10h-1fh) I/O Memory Management Unit
00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Richland [Radeon HD 8470D]
00:01.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Trinity HDMI Audio Controller
00:10.0 USB controller: Advanced Micro Devices, Inc. [AMD] FCH USB XHCI Controller (rev 09)
00:10.1 USB controller: Advanced Micro Devices, Inc. [AMD] FCH USB XHCI Controller (rev 09)
00:11.0 SATA controller: Advanced Micro Devices, Inc. [AMD] FCH SATA Controller [IDE mode] (rev 40)
00:12.0 USB controller: Advanced Micro Devices, Inc. [AMD] FCH USB OHCI Controller (rev 11)
00:12.2 USB controller: Advanced Micro Devices, Inc. [AMD] FCH USB EHCI Controller (rev 11)
00:13.0 USB controller: Advanced Micro Devices, Inc.

[AMD] FCH USB OHCI Controller (rev 11)
00:13.2 USB controller: Advanced Micro Devices, Inc. [AMD] FCH USB EHCI Controller (rev 11)
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 16)
00:14.2 Audio device: Advanced Micro Devices, Inc. [AMD] FCH Azalia Controller (rev 01)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 11)
00:14.4 PCI bridge: Advanced Micro Devices, Inc. [AMD] FCH PCI Bridge (rev 40)
00:14.5 USB controller: Advanced Micro Devices, Inc. [AMD] FCH USB OHCI Controller (rev 11)
00:15.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] Hudson PCI to PCI bridge (PCIE port 0)
00:15.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Hudson PCI to PCI bridge (PCIE port 2)
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h (Models 10h-1fh) Processor Function 0
00:18.1 Host bridge: Advanced Micro Devices, Inc.

[AMD] Family 15h (Models 10h-1fh) Processor Function 1
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h (Models 10h-1fh) Processor Function 2
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h (Models 10h-1fh) Processor Function 3
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h (Models 10h-1fh) Processor Function 4
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 15h (Models 10h-1fh) Processor Function 5
03:00.0 Ethernet controller: Broadcom Inc. and subsidiaries NetXtreme BCM5762 Gigabit Ethernet PCIe (rev 10)

ifconfig:

eno1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
ether 64:51:06:47:89:c1 txqueuelen 1000 (Ethernet)
RX packets 44364 bytes 32757818 (32.7 MB)
RX errors 0 dropped 4 overruns 0 frame 0
TX packets 7225 bytes 863721 (863.7 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 18

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 2575 bytes 259082 (259.0 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 2575 bytes 259082 (259.0 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

wlx244bfe3b68b4: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.0.0.130 netmask 255.255.255.0 broadcast 10.0.0.255
inet6 2601:601:f80:89b0:e1f3:f529:98da:3d6a prefixlen 64 scopeid 0x0<global>
inet6 fe80::3e9:31f9:3a14:e6cf prefixlen 64 scopeid 0x20<link>
inet6 2601:601:f80:89b0:a990:97a0:7dfe:3af3 prefixlen 64 scopeid 0x0<global>
inet6 2601:601:f80:89b0::cf48 prefixlen 128 scopeid 0x0<global>
ether 24:4b:fe:3b:68:b4 txqueuelen 1000 (Ethernet)
RX packets 514733 bytes 703673055 (703.6 MB)
RX errors 0 dropped 9564 overruns 0 frame 0
TX packets 186320 bytes 26218492 (26.2 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lshw -C network:

*-network
description: Ethernet interface
product: NetXtreme BCM5762 Gigabit Ethernet PCIe
vendor: Broadcom Inc. and subsidiaries
physical id: 0
bus info: pci@0000:03:00.0
logical name: eno1
version: 10
serial: 64:51:06:47:89:c1
size: 1Gbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm vpd msi msix 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=5762-v1.29 latency=0 link=yes multicast=yes port=
twisted pair speed=1Gbit/s
resources: irq:18 memory:e0020000-e002ffff memory:e0010000-e001ffff memory:e0000000-e000ffff
*-network
description: Wireless interface
physical id: 2
bus info: usb@2:4
logical name: wlx244bfe3b68b4
serial: 24:4b:fe:3b:68:b4
capabilities: ethernet physical wireless
configuration: broadcast=yes driver=rtl88x2bu ip=10.0.0.130 multicast=yes wireless=IEEE 802.11AC

lscpu:

Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
Address sizes: 48 bits physical, 48 bits virtual
CPU(s): 2
On-line CPU(s) list: 0,1
Thread(s) per core: 2
Core(s) per socket: 1
Socket(s): 1
NUMA node(s): 1
Vendor ID: AuthenticAMD
CPU family: 21
Model: 19
Model name: AMD A4 PRO-7300B APU with Radeon HD Graphics
Stepping: 1
Frequency boost: enabled
CPU MHz: 2739.034
CPU max MHz: 3800.0000
CPU min MHz: 1800.0000
BogoMIPS: 7586.07
L1d cache: 16 KiB
L1i cache: 64 KiB
L2 cache: 1 MiB
NUMA node0 CPU(s): 0,1
Vulnerability Itlb multihit: Not affected
Vulnerability L1tf: Not affected
Vulnerability Mds: Not affected
Vulnerability Meltdown: Not affected
Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl and seccomp
Vulnerability Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization
Vulnerability Spectre v2: Mitigation; Full AMD retpoline, IBPB conditional, STIBP disabled, RSB filling
Vulnerability Srbds: Not affected
Vulnerability Tsx async abort: Not affected
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr
_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf pni pclmulqdq monitor ssse3 fma
cx16 sse4_1 sse4_2 popcnt aes xsave avx f16c lahf_lm cmp_legacy extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw
ibs xop skinit wdt lwp fma4 tce nodeid_msr tbm topoext perfctr_core perfctr_nb cpb hw_pstate ssbd ibpb vmmcall bmi1 arat n
pt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold

Thanks in advance for any help, I'm happy to post more info if needed.

[oshunluvr]

https://askubuntu.com/questions/1285...-after-a-while

[onepapership]

I was confused at first about how I missed this, then realized I had only done general searches, not with my hardware - thanks for digging up the obvious for me, it's been working perfectly for about 90 minutes so far.

[oshunluvr]

Glad it's working - hopefully for good.

I always start with the most specific search possible, when work my way toward generlization as needed. Seems to work well most of the time. IME, network device issues tend to "expire" as newer kernels come out. Likely, you won't need that option within the next few months. Broadcom seems to drag it feet when it comes to kernel compatibility for some reason.