Eth0 cold plug = ok but eth0 hotplug = no carrier
Hello,
I have a Lenovo ThinkPad Edge 13, i3 380UM.
I have netcfg installed, but I only use it for wifi with wifi-select
in my rc.conf I have:
eth0="dhcp"
INTERFACES=(eth0)
DAEMONS=( @microcode @syslog-ng @network @crond @dbus @slim @alsa @laptop-mode )
When I boot with plugged cable in eth0, the wired network work without any problem.
But, if I boot, THEN plug a cable, restarting /etc/rc.d/network fails, dhcpcd give a "no carrier" error, and manual addressing with route / ifconfig doesn't help either.
Please any idea?
I saw http://ubuntuforums.org/archive/index.php/t-741147.html but in my case, I have alway separate interface for wired (eth0) en wifi (wlan0)
Hello, this may be caused by PCI power management.
What is the output of
ip link show eth0
If the line contains "NO-CARRIER" even though there's a cable connected to your eth0 port, it is possible that the device was auto-suspended and the media sense feature doesn't work. To solve this, first you need to find your ethernet controllers PCI address by
lspci
in my case the output looks like this:
00:19.0 Ethernet controller: Intel Corporation 82577LM Gigabit Network Connection (rev 06)
So the address is 00:19.0.
Now let's check the PM status of the device by issuing
cat "/sys/bus/pci/devices/0000:00:19.0/power/control"
substituting 00:19.0 with the address obtained from lspci.
If the output reads "auto", you can try to bring the device out of suspend by
echo on > "/sys/bus/pci/devices/0000:00:19.0/power/control"
Don't forget to substitute the address again.
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