il serait bon avant de savoir deux ou trois petites choses:
* Sous Mandriva, la mise en veille et le retour de mise en veille fonctionnait-il correctement sur cette machine ?
Oui
* En général, cette machine fait-elle la mise en veille et le retour sans problème ?
Oui
* Qu'est-ce que c'est comme machine ?
Netbook Hercules E-Café EC-900 , connexion en wi-fi sur une Livebox2.
Voici la sortie de la commande
cat /var/log/messages |grep wlan0
Jul 18 11:01:21 localhost ifplugd(wlan0)[10412]: ifplugd 0.28 initializing.
Jul 18 11:01:21 localhost ifplugd(wlan0)[10412]: Using interface wlan0/00:0D:F0:59:66:6C
Jul 18 11:01:21 localhost ifplugd(wlan0)[10412]: Using detection mode: wireless extension
Jul 18 11:01:21 localhost ifplugd(wlan0)[10412]: Initialization complete, link beat detected.
Jul 18 11:01:21 localhost ifplugd(wlan0)[10412]: Executing '/etc/ifplugd/ifplugd.action wlan0 up'.
Jul 18 11:01:22 localhost ifplugd(wlan0)[10412]: client: Wireless device wlan0 is configured with a roaming daemon but isn't associated
Jul 18 11:01:28 localhost ifplugd(wlan0)[10412]: Program executed successfully.
Jul 18 11:02:33 localhost ifplugd(wlan0)[10412]: Executing '/etc/ifplugd/ifplugd.action wlan0 down'.
Jul 18 11:02:34 localhost ifplugd(wlan0)[10412]: Program executed successfully.
Jul 18 11:02:34 localhost ifplugd(wlan0)[10412]: Exiting.
Jul 18 11:02:51 localhost ifplugd(wlan0)[13112]: ifplugd 0.28 initializing.
Jul 18 11:02:51 localhost ifplugd(wlan0)[13112]: Using interface wlan0/00:0D:F0:59:66:6C
Jul 18 11:02:51 localhost ifplugd(wlan0)[13112]: Using detection mode: wireless extension
Jul 18 11:02:51 localhost ifplugd(wlan0)[13112]: Initialization complete, link beat detected.
Jul 18 11:02:51 localhost ifplugd(wlan0)[13112]: Executing '/etc/ifplugd/ifplugd.action wlan0 up'.
Jul 18 11:02:51 localhost ifplugd(wlan0)[13112]: client: Wireless device wlan0 is configured with a roaming daemon but isn't associated
Jul 18 11:02:57 localhost ifplugd(wlan0)[13112]: Program executed successfully.
Jul 18 11:03:50 localhost ifplugd(wlan0)[13112]: Executing '/etc/ifplugd/ifplugd.action wlan0 down'.
Jul 18 11:04:55 localhost ifplugd(wlan0)[2301]: ifplugd 0.28 initializing.
Jul 18 11:04:55 localhost ifplugd(wlan0)[2301]: Using interface wlan0/00:0D:F0:59:66:6C
Jul 18 11:04:55 localhost ifplugd(wlan0)[2301]: Using detection mode: wireless extension
Jul 18 11:04:55 localhost ifplugd(wlan0)[2301]: Initialization complete, link beat not detected.
Jul 18 11:05:01 localhost ifplugd(wlan0)[2301]: Link beat detected.
Jul 18 11:05:05 localhost ifplugd(wlan0)[2301]: Executing '/etc/ifplugd/ifplugd.action wlan0 up'.
Jul 18 11:05:12 localhost ifplugd(wlan0)[2301]: Program executed successfully.
Jul 18 11:05:13 localhost ntpd[3031]: Listening on interface #3 wlan0, fe80::20d:f0ff:fe59:666c#123 Enabled
Jul 18 11:05:13 localhost ntpd[3031]: Listening on interface #5 wlan0, 192.168.1.12#123 Enabled
Jul 18 11:09:10 localhost ifplugd(wlan0)[2301]: Link beat lost.
Jul 18 11:09:15 localhost ifplugd(wlan0)[2301]: Link beat detected.
Jul 18 11:01:21 sortie de veille
pas de connexion internet
Jul 18 11:04:55 redémarrage
Connexion internet fonctionnelle.
Voilà, me dire s'il faut plus de détails, car je ne suis pas spécialiste

Merci pour ta disponibilité
NB Je fais un post séparé pour Update Notifier qui ne fonctionne pas.