[gentoo-user] netbook connects to Internet automatically, desktop doesn't

[Philip Webb]

By accident during my update of my ASUS EEE (now successfully completed),
I discovered that it connects automatically to the Internet
when the physical connection is plugged in,
while my desktop machine (AMD + Gigabyte mobo) has to be told by 'dhcpcd'.

The netbook's  syslog  reports (my comments marked by '# PP :')
(the 'Dec 31' date is due to failure of the mobo battery,
which forces me to enter the correct date by hand) :

Dec 31 19:00:23 localhost dhcpcd[1323]: version 6.4.7 starting
Dec 31 19:00:23 localhost dhcpcd[1323]: dev: loaded udev
Dec 31 19:00:23 localhost dhcpcd[1323]: no interfaces have a carrier
Dec 31 19:00:23 localhost dhcpcd[1323]: forked to background, child pid 1346
Dec 31 19:00:23 localhost kernel: atl1c 0000:01:00.0: Unable to allocate MSI interrupt Error: -38
Dec 31 19:00:23 localhost kernel: IPv6: ADDRCONF(NETDEV_UP): enp1s0: link is not ready
Dec 31 19:00:23 localhost dhcpcd[1346]: enp1s0: waiting for carrier
Dec 31 19:00:23 localhost dhcpcd[1346]: enp1s0: carrier acquired
Dec 31 19:00:23 localhost dhcpcd[1346]: DUID 00:01:00:01:03:c3:b8:97:00:26:18:79:64:16
Dec 31 19:00:23 localhost dhcpcd[1346]: enp1s0: IAID 18:79:64:16
Dec 31 19:00:23 localhost dhcpcd[1346]: enp1s0: carrier lost
Dec 31 19:00:29 localhost dhcpcd[1346]: enp1s0: using IPv4LL address 169.254.91.169
Dec 31 19:00:29 localhost dhcpcd[1346]: enp1s0: adding route to 169.254.0.0/16
Dec 31 19:00:33 localhost dhcpcd[1346]: enp1s0: soliciting a DHCP lease
...
Feb  8 18:54:59 localhost dhcpcd[1346]: enp1s0: carrier acquired
...
Feb  8 18:54:59 localhost dhcpcd[1346]: enp1s0: IAID 18:79:64:16
Feb  8 18:54:59 localhost dhcpcd[1346]: enp1s0: soliciting a DHCP lease
Feb  8 18:55:07 localhost dhcpcd[1346]: enp1s0: offered 192.168.1.3 from 192.168.1.1
Feb  8 18:55:11 localhost dhcpcd[1346]: enp1s0: leased 192.168.1.3 for 86400 seconds
Feb  8 18:55:11 localhost dhcpcd[1346]: enp1s0: adding route to 192.168.1.0/24
Feb  8 18:55:11 localhost dhcpcd[1346]: enp1s0: adding default route via 192.168.1.1
Feb  8 18:55:11 localhost dhcpcd[1346]: enp1s0: deleting route to 169.254.0.0/16
...
# PP : remove/restore conn'n
Feb  8 19:14:41 localhost dhcpcd[1346]: enp1s0: carrier lost
Feb  8 19:14:41 localhost dhcpcd[1346]: enp1s0: deleting route to 192.168.1.0/24
Feb  8 19:14:41 localhost dhcpcd[1346]: enp1s0: deleting default route via 192.168.1.1
Feb  8 19:15:15 localhost dhcpcd[1346]: enp1s0: carrier acquired
Feb  8 19:15:15 localhost kernel: atl1c 0000:01:00.0: atl1c: enp1s0 NIC Link is Up<100 Mbps Full Duplex>
Feb  8 19:15:15 localhost dhcpcd[1346]: enp1s0: IAID 18:79:64:16
Feb  8 19:15:15 localhost dhcpcd[1346]: enp1s0: rebinding lease of 192.168.1.3
Feb  8 19:15:23 localhost dhcpcd[1346]: enp1s0: leased 192.168.1.3 for 86400 seconds
Feb  8 19:15:23 localhost dhcpcd[1346]: enp1s0: adding route to 192.168.1.0/24
Feb  8 19:15:23 localhost dhcpcd[1346]: enp1s0: adding default route via 192.168.1.1
# PP : Dillo finds site

The desktop machine's  syslog  reports :

Feb  8 09:26:09 localhost dhcpcd[980]: version 6.6.7 starting
Feb  8 09:26:09 localhost dhcpcd[980]: dev: loaded udev
Feb  8 09:26:09 localhost dhcpcd[980]: no interfaces have a carrier
Feb  8 09:26:09 localhost dhcpcd[980]: forked to background, child pid 997
Feb  8 09:26:09 localhost dhcpcd[997]: enp5s0: waiting for carrier
Feb  8 09:26:09 localhost kernel: r8169 0000:05:00.0 enp5s0: link down
Feb  8 09:26:09 localhost kernel: r8169 0000:05:00.0 enp5s0: link down
Feb  8 09:26:09 localhost kernel: IPv6: ADDRCONF(NETDEV_UP): enp5s0: link is not ready
Feb  8 09:26:11 localhost dhcpcd[997]: enp5s0: carrier acquired
Feb  8 09:26:11 localhost kernel: r8169 0000:05:00.0 enp5s0: link up
Feb  8 09:26:11 localhost kernel: IPv6: ADDRCONF(NETDEV_CHANGE): enp5s0: link becomes ready
Feb  8 09:26:11 localhost dhcpcd[997]: DUID 00:01:00:01:1a:1b:b4:7e:50:e5:49:c6:10:3a
Feb  8 09:26:11 localhost dhcpcd[997]: enp5s0: IAID 49:c6:10:3a
Feb  8 09:26:11 localhost dhcpcd[997]: enp5s0: rebinding lease of 192.168.1.2
Feb  8 09:26:14 localhost dhcpcd[997]: enp5s0: NAK: from 192.168.1.1
Feb  8 09:26:14 localhost dhcpcd[997]: enp5s0: soliciting a DHCP lease
Feb  8 09:26:16 localhost dhcpcd[997]: enp5s0: offered 192.168.1.2 from 192.168.1.1
Feb  8 09:26:21 localhost dhcpcd[997]: enp5s0: leased 192.168.1.2 for 86400 seconds
Feb  8 09:26:21 localhost dhcpcd[997]: enp5s0: adding route to 192.168.1.0/24
Feb  8 09:26:21 localhost dhcpcd[997]: enp5s0: adding default route via 192.168.1.1
Feb  8 09:26:22 localhost ntpd[837]: Listen normally on 2 enp5s0 192.168.1.2:123
...
# PP : 'ioff', remove conn'n
Feb  8 18:54:26 localhost dhcpcd[11404]: sending signal ARLM to pid 997
Feb  8 18:54:26 localhost dhcpcd[11404]: waiting for pid 997 to exit
Feb  8 18:54:26 localhost dhcpcd[997]: received signal ALRM from PID 11404, releasing
Feb  8 18:54:26 localhost dhcpcd[997]: enp5s0: removing interface
Feb  8 18:54:26 localhost dhcpcd[997]: enp5s0: releasing lease of 192.168.1.2
Feb  8 18:54:26 localhost dhcpcd[997]: enp5s0: deleting route to 192.168.1.0/24
Feb  8 18:54:26 localhost dhcpcd[997]: enp5s0: deleting default route via 192.168.1.1
Feb  8 18:54:26 localhost dhcpcd[997]: exited
...
Feb  8 18:54:35 localhost kernel: r8169 0000:05:00.0 enp5s0: link down
...
# PP : restore conn'n
Feb  8 19:18:11 localhost kernel: r8169 0000:05:00.0 enp5s0: link up
# PP : Firefox can't find site

I've checked  /etc/runlevels/default  &  /etc/udev  in both machines,
but can't see anything different between the two.
IIRC the netbook didn't show this behaviour before the recent update,
But both machines have similarly updated pkgs.
The kernels are 3.17 & 3.18 ; desktop manager is Fluxbox.

Can anyone explain what I need to do
to get the desktop machine to behave as helpfully as the netbook does ?

-- 
========================,,============================================
SUPPORT     ___________//___,   Philip Webb
ELECTRIC   /] [] [] [] [] []|   Cities Centre, University of Toronto
TRANSIT    `-O----------O---'   purslowatchassdotutorontodotca