Hi Varun and thanks for your patience
Mainboard is ASUS, model P5KPL-AM SE
No IOMMU setting found in BIOS.
I found a setting LAN Option ROM which I enabled and then disabled again because it didn't have any apparent effect.
I also found a setting in the "Tools" section called "AI NET 2" with the option to "Check Realtek LAN Cable". When enabled it would report "LAN cable not ready" and send me back to BIOS setup. If I tried to go into the IA NET 2 menu again BIOS would hang forcing me to hard reset. I had to reinstate BIOS defaults to disable LAN Cable check.
BTW: I did, of course, plug the cable into another computer to make sure it works.
Reinstated BIOS defaults -> nothing changes, i.e. network still down
Reduced speed as per command you proposed -> no go
I looked at /var/log/dmesg which I find kind of cryptic
Searching for lines containing "eth0" I find, for example:
Code:
ADDRCONF(NETDEV_UP): eth0: Link is not ready
r8169 0000:01:00.0: eth0: link down
/var/log/syslog basically says the same but there is additional information that might be relevant:
Code:
Network Manager[762]: Ifupdown: get unmanaged devices count: 0
Network Manager[762]: SCPlugin-Ifupdown: (16300848) ... get_connections.
Network Manager[762]: SCPlugin-Ifupdown: (16300848) ... get_connections (managed=false): return empty list.
Network Manager[762]: keyfile: parsing Wired connection 1 ...
Network Manager[762]: keyfile: read connection 'Wired connection 1'
Network Manager[762]: Ifupdown: get managed devices count: 0
Network Manager[762]: <info> modem manager is now available
Network Manager[762]: <info> monitoring kernel firmware directory 'lib/firmware'.
Network Manager[762]: <info> WiFi enabled by radio killswitch; enabled by statefile
Network Manager[762]: <info> WWAN enabled by radio killswitch; enabled by statefile
Network Manager[762]: <info> WiMAX enabled by radio killswitch; enabled by statefile
Network Manager[762]: <info> networking is enabled by statefile
Network Manager[762]: <warn> failed to allocate link cache: (-10) operation not supported
Network Manager[762]: <info> (eth0): carrier is OFF
Network Manager[762]: <info> (eth0): new Ethernet device (driver 'r8169' ifindex: 2)
Network Manager[762]: <info> (eth0): exported as /org/freedesktop/NetworkManager/Devices/0
Network Manager[762]: <info> (eth0): now managed
Network Manager[762]: <info> (eth0): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
Network Manager[762]: <info> (eth0): bringing up device.
Network Manager[762]: <info> (eth0): preparing device.
Network Manager[762]: <info> (eth0): deactivating device (reasong 'managed') [2]
kernel: [ 10.121108] r8169 0000:01:00.0: eth0: link down
kernel: [ 10.121651] ADDRCONF(NETDEV_UP): eth0: Link is not ready
kernel: [ 10.122120] ADDRCONF(NETDEV_UP): eth0: Link is not ready
I had to copy this by hand (no network and I forgot to bring my pendrive) from the borked compter's screen, so there may be typos.
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