L'installation de laptop-mode a eu pour effet de me couper ethernet. C'est d'autant plus bizarre que cela marche bien sur un autre portable. C'est lié à une interaction entre les deux programmes, puisque retirer laptop-mode des daemons résout le problème.
Voilà le log de wicd sans laptop-mode
Le log après avoir désactivé laptop-mode12:49:42 :: wicd is version 1.7.0 552
12:49:42 :: setting backend to external
12:49:42 :: trying to load backend external
12:49:42 :: successfully loaded backend external
12:49:43 :: trying to load backend external
12:49:43 :: successfully loaded backend external
12:49:43 :: Automatically detected wireless interface wlan0
12:49:43 :: setting wireless interface wlan0
12:49:43 :: automatically detected wired interface eth0
12:49:43 :: setting wired interface eth0
12:49:43 :: setting wpa driver wext
12:49:43 :: setting use global dns to False
12:49:43 :: setting global dns
12:49:43 :: global dns servers are None None None
12:49:43 :: domain is None
12:49:43 :: search domain is None
12:49:43 :: setting automatically reconnect when connection drops True
12:49:43 :: Setting dhcp client to 0
12:49:43 :: Wireless configuration file found...
12:49:43 :: Wired configuration file found...
12:49:43 :: chmoding configuration files 0600...
12:49:43 :: chowning configuration files root:root...
12:49:43 :: Using wireless interface...wlan0
12:49:43 :: Using wired interface...eth0
12:49:49 :: Autoconnecting...
12:49:51 :: No wired connection present, attempting to autoconnect to wireless network
12:49:51 :: Unable to autoconnect, you'll have to manually connect
12:49:54 :: Autoconnecting...
12:49:54 :: No wired connection present, attempting to autoconnect to wireless network
12:49:54 :: Unable to autoconnect, you'll have to manually connect
12:49:59 :: Autoconnecting...
12:49:59 :: No wired connection present, attempting to autoconnect to wireless network
12:49:59 :: Unable to autoconnect, you'll have to manually connect
12:50:04 :: Autoconnecting...
12:50:04 :: No wired connection present, attempting to autoconnect to wireless network
12:50:04 :: Unable to autoconnect, you'll have to manually connect
12:52:38 :: Daemon going down, killing wicd-monitor...
12:52:38 :: Removing PID file...
12:52:38 :: Shutting down...
12:52:38 :: Exception KeyError: KeyError(140493814793984,) in <module 'threading' from '/usr/lib/python2.7/threading.pyo'> ignored
J'ai essayé divers trucs: désactiver le module ethernet de laptop-mode (dans etc/laptop-mode/conf.d), inverser l'ordre de démarrage des daemons, attendre que wicd ait démarré pour lancer laptop-mode… Sans effet. Le truc qui aurait pu clocher est que dans le même temps j'ai changé le hostname (dans trois fichiers: rc.conf, host et wicd/wired-management.conf). Peut-être y-a-t-il un fichier qui traîne avec le vieux nom, mais toujours est-il que cela n'empêche pas wicd de détecter le cable sans laptop-mode.12:53:20 :: wicd is version 1.7.0 552
12:53:20 :: setting backend to external
12:53:20 :: trying to load backend external
12:53:20 :: successfully loaded backend external
12:53:20 :: trying to load backend external
12:53:20 :: successfully loaded backend external
12:53:20 :: Automatically detected wireless interface wlan0
12:53:20 :: setting wireless interface wlan0
12:53:20 :: automatically detected wired interface eth0
12:53:20 :: setting wired interface eth0
12:53:20 :: setting wpa driver wext
12:53:20 :: setting use global dns to False
12:53:20 :: setting global dns
12:53:20 :: global dns servers are None None None
12:53:20 :: domain is None
12:53:20 :: search domain is None
12:53:20 :: setting automatically reconnect when connection drops True
12:53:20 :: Setting dhcp client to 0
12:53:20 :: Wireless configuration file found...
12:53:20 :: Wired configuration file found...
12:53:20 :: chmoding configuration files 0600...
12:53:20 :: chowning configuration files root:root...
12:53:20 :: Using wireless interface...wlan0
12:53:20 :: Using wired interface...eth0
12:53:26 :: Autoconnecting...
12:53:28 :: Attempting to autoconnect with wired interface...
12:53:28 :: Putting interface down
12:53:28 :: Releasing DHCP leases...
12:53:28 :: Setting false IP...
12:53:28 :: Flushing the routing table...
12:53:28 :: Putting interface up...
12:53:30 :: Running DHCP with hostname roquefort
12:53:30 :: dhcpcd[1259]: version 5.2.12 starting
12:53:30 ::
12:53:31 :: dhcpcd[1259]: eth0: rebinding lease of 192.168.1.77
12:53:31 ::
12:53:31 :: dhcpcd[1259]: eth0: acknowledged 192.168.1.77 from 192.168.1.254
12:53:31 ::
12:53:31 :: dhcpcd[1259]: eth0: checking for 192.168.1.77
12:53:31 ::
12:53:35 :: dhcpcd[1259]: eth0: leased 192.168.1.77 for 86400 seconds
12:53:35 ::
12:53:35 :: dhcpcd[1259]: forked to background, child pid 1354
12:53:35 ::
12:53:35 ::
12:53:35 :: DHCP connection successful
12:53:35 :: Connecting thread exiting.
12:53:40 :: Sending connection attempt result Success
13:02:44 :: did not find pref_width in configuration, setting default -1
13:02:44 :: did not find pref_height in configuration, setting default -1
13:02:44 :: trying to load backend external
13:02:44 :: trying to load backend ioctl
13:02:44 :: WARNING: python-iwscan not found, falling back to using iwlist scan.
13:02:44 :: WARNING: python-wpactrl not found, falling back to using wpa_cli.
PS: l'option log de laptop-mode est bien activée, mais je ne sais pas où atterrissent les logs.
EDIT: c'était a priori un problème de cable défectueux. Cela n'explique pas tous les problèmes, mais une partie d'entre eux. Je vais changer le cable, réinstaller wicd puis laptop-mode et voir ce que cela donne. Espérons que je passe en résolu pur… Désolé aussi pour la mauvaise catégorie du topic…
EDIT 2: même problème avec un nouveau cable, je laisse tomber et retourne sur cpufreq-utils combiné à powersave
