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Tried ;powering off the modem when switching, no change in behaviour.
#dhcpcd eth0 got
#err, eth0:ioctl SIOCGIFHWADDR: No such device
#dmesg | grep -i eth and get
driver 'st' needs updating - please use bus_type methods
driver 'sd' needs updating - please use bus_type methods
driver 'sr' needs updating - please use bus_type methods
#tail -f /var/log/messages
and got six messages about [fglrx] and then:
Jul 26 08:44:38 host dbus-daemon: Rejected send message, 1 matched rules; type="method_c all", sender=":1.10" (uid=1000 pid-3747 comm="xfce4-power-manager ") interface=org.freedesktop.Hal.Device.SystemPowerManagement" member="JustToCheck" error name ="(unset)" requested_reply=0 destination="org.freedesktop.Hal" (uid=0 pid=3491 comm="/usr/sbin/hald --daemon=yes "))
Jul 26 08:45:32 host dhcpcd: eth0: dhcpcd 3.2.3 starting
Jul 26 08:45:32 host dhcpcd: eth0: exiting
Okay, first off you do have a problem here, but it's going to take some extra steps.
Your network card isn't even detected by lspci which is NOT promising, but it does shed some light into the matter. Now we need to dig more into the schematics of the PC you have the problems with. So lets start from scratch here. The following questions are going to be a bit direct but unless they are answered we won't get anywhere.
1. Did your PC ever come with another OS like Windows, and if so, did you ever have any problems with the Network Card on it?
2. Go into your BIOS/CMOS and check and see if the Ethernet Adapter/Port is enabled. If it's disabled, enable it. Never hurts to check this out.
3. What is the model and make of your PC and how old is it?
Once we have this information we can find out what the problem is and look into resolving it.