EDIT: I've found an appropriate driver
https://github.com/ghostrider-reborn/realtek-r8101-linux-driver
I followed instructions here and now both network cards work (I only use one at a time because I'm testing connecting them to the same network.)
Original post
I installed Kubuntu 18.04 on a computer which has previously been running Kubuntu 14.04, and I've not been able to get one of the two network cards working successfully. Unfortunately, I need both of them to be configured for my lab setup.
I've tried plugging either of them with the same ethernet cable, but only the RTL8111 ever works. dmesg doesn't have anything for Ethernet or Network in it, and journalctl -xe only mentions the successful loading of the RTL8111 driver.
Below are some diagnostic outputs that you will hopefully find useful
lshw -C network
*-network UNCLAIMED
description: Ethernet controller
product: RTL810xE PCI Express Fast Ethernet controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:02:00.0
version: 02
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list
configuration: latency=0
resources: ioport:b800(size=256) memory:f7cff000-f7cfffff memory:cfff0000-cfffffff
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:01:00.0
logical name: enp1s0
version: 03
serial: [redacted]
size: 1Gbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list rom ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8168 driverversion=8.046.00-NAPI duplex=full latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
resources: irq:31 ioport:a800(size=256) memory:cfeff000-cfefffff memory:cfef8000-cfefbfff memory:f7be0000-f7bfffff
*-network
description: Ethernet interface
physical id: 1
logical name: enp0s26f7u1
serial: [redacted]
capabilities: ethernet physical
configuration: broadcast=yes driver=rndis_host driverversion=22-Aug-2005 firmware=RNDIS device ip=192.168.42.163 link=yes multicast=yes
Kubuntu can see the network cards (the third device is my phone using USB tethering), however the first one is "UNCLAIMED"
lspci -v | grep -A20 Ethernet
01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 03)
Subsystem: ASRock Incorporation Motherboard (one of many)
Physical Slot: 0-3
Flags: bus master, fast devsel, latency 0, IRQ 31
I/O ports at a800 [size=256]
Memory at cfeff000 (64-bit, prefetchable) [size=4K]
Memory at cfef8000 (64-bit, prefetchable) [size=16K]
Expansion ROM at f7be0000 [disabled] [size=128K]
Capabilities: [40] Power Management version 3
Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [70] Express Endpoint, MSI 01
Capabilities: [ac] MSI-X: Enable- Count=4 Masked-
Capabilities: [cc] Vital Product Data
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Virtual Channel
Capabilities: [160] Device Serial Number [redacted]
Kernel driver in use: r8168
Kernel modules: r8168
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL810xE PCI Express Fast Ethernet controller (rev 02)
Subsystem: Realtek Semiconductor Co., Ltd. RTL810xE PCI Express Fast Ethernet controller
Physical Slot: 0-2
Flags: bus master, fast devsel, latency 0, IRQ 11
I/O ports at b800 [size=256]
Memory at f7cff000 (64-bit, non-prefetchable) [size=4K]
Memory at cfff0000 (64-bit, prefetchable) [size=64K]
Capabilities: [40] Power Management version 3
Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+
Capabilities: [70] Express Endpoint, MSI 01
Capabilities: [ac] MSI-X: Enable- Count=2 Masked-
Capabilities: [cc] Vital Product Data
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Virtual Channel
Capabilities: [160] Device Serial Number [redacted]
It has loaded the kernel module for the first card, however it hasn't done anything for the second card.
lsmod
Module Size Used by
intel_powerclamp 20480 0
snd_hda_codec_realtek 114688 1
coretemp 20480 0
snd_hda_codec_generic 77824 1 snd_hda_codec_realtek
kvm_intel 241664 0
ledtrig_audio 16384 2 snd_hda_codec_generic,snd_hda_codec_realtek
kvm 647168 1 kvm_intel
snd_hda_intel 49152 5
irqbypass 16384 1 kvm
snd_hda_codec 135168 3 snd_hda_codec_generic,snd_hda_intel,snd_hda_codec_realtek
snd_hda_core 86016 4 snd_hda_codec_generic,snd_hda_intel,snd_hda_codec,snd_hda_codec_realtek
rndis_host 20480 0
snd_hwdep 20480 1 snd_hda_codec
ni_pcimio 73728 0
cdc_ether 20480 1 rndis_host
ni_tiocmd 16384 1 ni_pcimio
mite 20480 2 ni_tiocmd,ni_pcimio
snd_pcm 102400 4 snd_hda_intel,snd_hda_codec,snd_hda_core
usbnet 45056 2 rndis_host,cdc_ether
comedi_pci 16384 2 mite,ni_pcimio
intel_cstate 20480 0
mii 16384 1 usbnet
ni_routing 299008 2 ni_tiocmd,ni_pcimio
input_leds 16384 0
ni_tio 20480 2 ni_tiocmd,ni_pcimio
comedi_8255 16384 1 ni_pcimio
snd_seq_midi 20480 0
snd_seq_midi_event 16384 1 snd_seq_midi
comedi 73728 5 mite,comedi_pci,ni_tiocmd,ni_pcimio,comedi_8255
snd_rawmidi 36864 1 snd_seq_midi
snd_seq 69632 2 snd_seq_midi,snd_seq_midi_event
gpio_ich 16384 0
snd_seq_device 16384 3 snd_seq,snd_seq_midi,snd_rawmidi
snd_timer 36864 2 snd_seq,snd_pcm
snd 86016 19 snd_hda_codec_generic,snd_seq,snd_seq_device,snd_hwdep,snd_hda_intel,snd_hda_codec,snd_hda_codec_realtek,snd_timer,snd_pcm,snd_rawmidi
serio_raw 20480 0
soundcore 16384 1 snd
i5500_temp 16384 0
lpc_ich 24576 0
i7core_edac 24576 0
mac_hid 16384 0
sch_fq_codel 20480 3
parport_pc 36864 0
ppdev 24576 0
lp 20480 0
parport 53248 3 parport_pc,lp,ppdev
ip_tables 32768 0
x_tables 40960 1 ip_tables
autofs4 45056 2
nouveau 1871872 20
hid_generic 16384 0
video 49152 1 nouveau
i2c_algo_bit 16384 1 nouveau
ttm 102400 1 nouveau
mxm_wmi 16384 1 nouveau
drm_kms_helper 180224 1 nouveau
syscopyarea 16384 1 drm_kms_helper
sysfillrect 16384 1 drm_kms_helper
psmouse 151552 0
sysimgblt 16384 1 drm_kms_helper
usbhid 53248 0
fb_sys_fops 16384 1 drm_kms_helper
hid 126976 2 usbhid,hid_generic
drm 483328 10 drm_kms_helper,ttm,nouveau
firewire_ohci 40960 0
pata_acpi 16384 0
ahci 40960 0
firewire_core 65536 1 firewire_ohci
r8168 528384 0
pata_via 16384 0
libahci 32768 1 ahci
crc_itu_t 16384 1 firewire_core
wmi 28672 2 mxm_wmi,nouveau
5th line from the end is the driver for the RTL8111 card, and I don't know if this is actually useful for you at all.
lspci -nn
01:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 03)
02:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL810xE PCI Express Fast Ethernet Controller [10ec:8136] (rev 02)
Best Answer
lspci -nn
modinfo r8169 | grep 8136 # the r8169 driver will see the RTL810xE
The system is not seeing the RTL810xE ethernet card. This is because you have the r8168-dkms driver installed, which works fine for the RTL8111/8168/8411 ethernet card, but not the RTL810xE.
Recommend uninstalling the r8101 github driver, and the r8168-dkms driver, and letting the standard r8169 driver find both cards.
This would also make software updates faster if kernel updates are included, as it won't have to additionally rebuild dkms drivers.