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Over the past few weeks I have noticed this. It works on first boot but after waking from hibernation plugging in an ethernet cable is not recognized.
System info that may be helpful (if any more is needed please ask):
$ uname -r
4.15.10-1-ARCH $ lspci -v
03:00.0 Network controller: Intel Corporation Wireless 8265 / 8275 (rev 78)
Subsystem: Intel Corporation Wireless 8265 / 8275
Flags: bus master, fast devsel, latency 0, IRQ 138
Memory at a4200000 (64-bit, non-prefetchable) [size=8K]
Capabilities: <access denied>
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi
04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 10)
Subsystem: Lenovo RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
Flags: bus master, fast devsel, latency 0, IRQ 137
I/O ports at 3000 [size=256]
Memory at a4104000 (64-bit, non-prefetchable) [size=4K]
Memory at a4100000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: r8169
Kernel modules: r8169Offline
Offline