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#1 2017-04-22 10:05:50

Klanecek
Member
Registered: 2017-04-22
Posts: 9

[SOLVED] No ethernet adapter/connection

Hello, I've been struggling to get Arch working for a couple of days now, I have finally managed to get a desktop envirovment (xfce4) now I am tackling my network issues. I have an ethernet cable connected to the laptop which worked fine on Linux mint but now the computer doesn't even show me an ethernet adapter as far as I can tell and dhcpcd did nothing.

I installed all the packages via my broken wifi (was broken on LM too) which turns itself off every couple of minutes and even to get that working in terminal I had to do "echo "blacklist hp_wmi" > /etc/modprobe.d/hp.conf" and "rfkill unblock all" (or I would get an error when I did ip link set up) every time to set it up, plus I had to do "ip link set wlp2s0 up" then "ip link set wlp2s0 down" then "wifi-menu" for it to work, which was a pain.

Any idea why my ethernet doesn't seem to work?

ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: wlp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 78:45:61:bd:c2:07 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.141/24 brd 192.168.1.255 scope global wlp2s0
       valid_lft forever preferred_lft forever
    inet6 fd66:9dc:e537:0:fb7d:ee4c:a5f2:7fae/64 scope global mngtmpaddr noprefixroute dynamic
       valid_lft 7174sec preferred_lft 3574sec
    inet6 fe80::7717:7c66:8ab2:6203/64 scope link
       valid_lft forever preferred_lft forever


lspci -k
<tons of irrelevant stuff> (no ethernet controller)
02:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8821AE 802.11ac PCIe Wireless Network Adapter
    Subsystem: Lenovo Device a814
    Kernel driver in use: rtl8821ae
    Kernel modules: rtl8821ae

Last edited by Klanecek (2017-04-22 11:21:17)

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#2 2017-04-22 11:01:43

alex.theoto
Member
From: Athens Greece
Registered: 2014-11-30
Posts: 307

Re: [SOLVED] No ethernet adapter/connection

Give us

lspci
lsusb

Did this happened after kernel upgrade or from the beginning?

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#3 2017-04-22 11:04:42

Alber
Member
From: Spain - España
Registered: 2011-11-11
Posts: 227

Re: [SOLVED] No ethernet adapter/connection

Hello.
Is there a BIOS option to enable or disable ethernet (or something as Onboard LAN)?
It was working with Linux Mint but could it has been disabled????


Because not all of us are native English speakers, try no to use slang or abbreviations, thank you.

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#4 2017-04-22 11:08:46

Klanecek
Member
Registered: 2017-04-22
Posts: 9

Re: [SOLVED] No ethernet adapter/connection

alex.theoto wrote:

Give us

lspci
lsusb

Did this happened after kernel upgrade or from the beginning?

It happened from the start, as soon as I booted it from the USB and it's still happening
lspci
00:00.0 Host bridge: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series SoC Transaction Register (rev 35)
00:02.0 VGA compatible controller: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Integrated Graphics Controller (rev 35)
00:13.0 SATA controller: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series SATA Controller (rev 35)
00:14.0 USB controller: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series USB xHCI Controller (rev 35)
00:1a.0 Encryption controller: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series Trusted Execution Engine (rev 35)
00:1b.0 Audio device: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series High Definition Audio Controller (rev 35)
00:1c.0 PCI bridge: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series PCI Express Port #1 (rev 35)
00:1c.2 PCI bridge: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series PCI Express Port #3 (rev 35)
00:1c.3 PCI bridge: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series PCI Express Port #4 (rev 35)
00:1f.0 ISA bridge: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series PCU (rev 35)
00:1f.3 SMBus: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx SMBus Controller (rev 35)
02:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8821AE 802.11ac PCIe Wireless Network Adapter

lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 005: ID 04f2:b581 Chicony Electronics Co., Ltd
Bus 001 Device 004: ID 0bda:0821 Realtek Semiconductor Corp.
Bus 001 Device 003: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
Bus 001 Device 002: ID 1af3:0001 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

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#5 2017-04-22 11:12:15

Klanecek
Member
Registered: 2017-04-22
Posts: 9

Re: [SOLVED] No ethernet adapter/connection

Alber wrote:

Hello.
Is there a BIOS option to enable or disable ethernet (or something as Onboard LAN)?
It was working with Linux Mint but could it has been disabled????

Checked for that, wireless LAN is enabled and there is nothing else.

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#6 2017-04-22 11:12:51

Lemongrass
Member
From: Central Europe
Registered: 2017-03-03
Posts: 59

Re: [SOLVED] No ethernet adapter/connection

Just an idea: maybe you could try installing linux-lts (the lts kernel). I've met another Arch user (whose main OS is not Arch btw.) on the LM forum (we were both using LM) and he also had a Realtek card but he said that the newest non-lts kernel broke the laptop's wireless connection. There must be a way to download it on another computer and install it. I guess this is worth a try.

My OS runs on the lts kernel. I had a little trouble with the original.

Last edited by Lemongrass (2017-04-22 11:14:34)

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#7 2017-04-22 11:20:43

Klanecek
Member
Registered: 2017-04-22
Posts: 9

Re: [SOLVED] No ethernet adapter/connection

Lemongrass wrote:

Just an idea: maybe you could try installing linux-lts (the lts kernel). I've met another Arch user (whose main OS is not Arch btw.) on the LM forum (we were both using LM) and he also had a Realtek card but he said that the newest non-lts kernel broke the laptop's wireless connection. There must be a way to download it on another computer and install it. I guess this is worth a try.

My OS runs on the lts kernel. I had a little trouble with the original.

That fixed EVERYTHING, thanks a lot big_smile been going crazy all week.

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#8 2017-04-22 11:28:54

Lemongrass
Member
From: Central Europe
Registered: 2017-03-03
Posts: 59

Re: [SOLVED] No ethernet adapter/connection

Klanecek wrote:
Lemongrass wrote:

Just an idea: maybe you could try installing linux-lts (the lts kernel). I've met another Arch user (whose main OS is not Arch btw.) on the LM forum (we were both using LM) and he also had a Realtek card but he said that the newest non-lts kernel broke the laptop's wireless connection. There must be a way to download it on another computer and install it. I guess this is worth a try.

My OS runs on the lts kernel. I had a little trouble with the original.

That fixed EVERYTHING, thanks a lot big_smile been going crazy all week.

Maybe something like this ("in case of strange errors try installing linux-lts") could be inserted into the "Installation guide" on ArchWiki. smile

Last edited by Lemongrass (2017-04-22 11:58:43)

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#9 2017-04-22 11:37:00

loqs
Member
Registered: 2014-03-06
Posts: 17,192

Re: [SOLVED] No ethernet adapter/connection

@Klanecek and @Lemongrass the linux-lts package is rebased every year so if no one fixes the issue upstream after the next linux-lts rebase it will broken in both linux and linux-lts.
Edit: reworked sentence to be clearer.

Last edited by loqs (2017-04-22 11:39:00)

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#10 2017-04-22 11:52:46

Lemongrass
Member
From: Central Europe
Registered: 2017-03-03
Posts: 59

Re: [SOLVED] No ethernet adapter/connection

@loqs: thanks for the info, nice to know. I had only a minor issue. I hope a kernel developer also meets this problem and fixes it.

Last edited by Lemongrass (2017-04-22 11:57:23)

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#11 2017-04-22 16:22:38

ewaller
Administrator
From: Pasadena, CA
Registered: 2009-07-13
Posts: 19,739

Re: [SOLVED] No ethernet adapter/connection

What type of system is this?  It appear to be a SoC based system.
With the lts kernel, check the installed modules using lsmod
Then, with the stock kernel, do the same thing.

Do the module lists match? Or is there something missing in stock kernel that exists in the lts kernel?


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Sometimes it is the people no one can imagine anything of who do the things no one can imagine. -- Alan Turing
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