Odroid C2 Gigabit Ethernet

[robrunner]

Hi,
I just got my Odroid C2 and installed and updated Arch on the 8 GB eMMC module and everything is working just fine, but the ethernet is only in 100 MBit/s mode. Only the green light of the Port is blinking, not the yellow one.
inxi -F tells me:
$this->bbcode_second_pass_code('', 'Network: Card: Failed to Detect Network Card!')
I tried to find any information about the Realtek 8211F network controller, but couldn't.
I couldn't find anything to solve this problem in the Arch Wiki/Forums.
How do I get it to work?
Thanks!

[WarheadsSE]

Considering the network cad is not on the PCI bus, I am not entirely surprised. (Yes, it happens here too)

$this->bbcode_second_pass_code('', '[whse@c2 ~]$ inxi -Fx
System: Host: c2 Kernel: 3.14.79-9-ARCH aarch64 (32 bit gcc: 6.2.1) Console: tty 0
Distro: Arch Linux ARM
Machine: No /sys/class/dmi; using dmidecode: dmidecode is not installed.
CPU: Quad core (-MCP-) (ARM)bmips:
clock speeds: max: 1536 MHz 1: 1536 MHz 2: 1536 MHz 3: 1536 MHz 4: 1536 MHz
Graphics: Card: Failed to Detect Video Card!
Display Server: N/A driver: fbdev tty size: 104x53 Advanced Data: N/A out of X
Audio: Card ODROID-HDMI driver: ODROID-HDMI Sound: ALSA v: k3.14.79-9-ARCH
Network: Card: Failed to Detect Network Card!
Drives: HDD Total Size: NA (-) ID-1: /dev/mmcblk0 model: N/A size: 15.8GB
Partition: ID-1: / size: 15G used: 13G (92%) fs: ext4 dev: /dev/mmcblk0p1
Sensors: None detected - is lm-sensors installed and configured?
Info: Processes: 91 Uptime: 14 min Memory: 78.4/1974.5MB Init: systemd Gcc sys: 6.2.1
Client: Shell (bash 4.3.461) inxi: 2.3.0 ')

Check the output of `dmesg | grep stmmac`

[robrunner]

$this->bbcode_second_pass_code('', '[alarm@alarm ~]$ dmesg | grep stmmac
[ 2.052094] libphy: stmmac: probed
[ 2.052116] eth0: PHY ID 001cc916 at 0 IRQ POLL (stmmac-0:00) active
[ 2.052126] eth0: PHY ID 001cc916 at 7 IRQ POLL (stmmac-0:07)
[ 10.482568] libphy: stmmac-0:00 - Link is Up - 100/Half')

[graysky]

Forgive the naive questions but is your cable up to specs? Is the router or switch as well? For mine:
$this->bbcode_second_pass_code('', '% dmesg | grep stmmac
[ 2.042141] libphy: stmmac: probed
[ 2.042163] eth0: PHY ID 001cc916 at 0 IRQ POLL (stmmac-0:00) active
[ 2.042173] eth0: PHY ID 001cc916 at 7 IRQ POLL (stmmac-0:07)
[ 11.702554] libphy: stmmac-0:00 - Link is Up - 1000/Full')

[robrunner]

Omg you are correct. How do I have an ethernet cable, that doesn't support gigabit ethernet?
It works perfectly fine with another one.
I am so sorry for wasting your time
Thanks a lot!

[WarheadsSE]

It is one of two things:
- The cable is only wired for 100 (2 pairs)
- The cable has damage on one of the secondary pairs for 1000