Voila le retour demandé :
# grep rtl8192cu /var/log/messages
Jun 11 16:06:15 Salon kernel: [ 82.519708] rtl8192cu: Chip version 0x10
Jun 11 16:06:15 Salon kernel: [ 82.601667] rtl8192cu: MAC address: c4:3d:c7:7f:2e:c3
Jun 11 16:06:15 Salon kernel: [ 82.601676] rtl8192cu: Board Type 0
Jun 11 16:06:15 Salon kernel: [ 82.601963] rtl8192cu: Loading firmware rtlwifi/rtl8192cufw.bin
Jun 11 16:06:15 Salon kernel: [ 82.602105] usbcore: registered new interface driver rtl8192cu
Jun 11 16:06:15 Salon NetworkManager[676]: <info> (wlan0): new 802.11 WiFi device (driver: 'rtl8192cu' ifindex: 4)
Jun 11 16:06:27 Salon kernel: [ 95.200479] rtl8192cu: MAC auto ON okay!
Jun 11 16:06:27 Salon kernel: [ 95.233175] rtl8192cu: Tx queue select: 0x05
Jun 11 16:07:22 Salon kernel: [ 149.728368] rtl8192cu: MAC auto ON okay!
Jun 11 16:07:22 Salon kernel: [ 149.761056] rtl8192cu: Tx queue select: 0x05
Jun 11 16:13:12 Salon kernel: [ 498.943627] rtl8192cu: MAC auto ON okay!
Jun 11 16:13:12 Salon kernel: [ 498.976324] rtl8192cu: Tx queue select: 0x05
Jun 11 16:27:11 Salon kernel: [ 1336.969078] Error: Driver 'rtl8192cu' is already registered, aborting...
Jun 11 16:27:56 Salon kernel: [ 1381.128496] Error: Driver 'rtl8192cu' is already registered, aborting...
Jun 11 16:30:42 Salon kernel: [ 16.075518] rtl8192cu: Chip version 0x10
Jun 11 16:30:42 Salon kernel: [ 16.157852] rtl8192cu: MAC address: c4:3d:c7:7f:2e:c3
Jun 11 16:30:42 Salon kernel: [ 16.157861] rtl8192cu: Board Type 0
Jun 11 16:30:42 Salon kernel: [ 16.158175] rtl8192cu: Loading firmware rtlwifi/rtl8192cufw.bin
Jun 11 16:30:42 Salon kernel: [ 16.158301] usbcore: registered new interface driver rtl8192cu
Jun 11 16:30:42 Salon kernel: [ 17.589808] Error: Driver 'rtl8192cu' is already registered, aborting...
Jun 11 16:30:43 Salon NetworkManager[717]: <info> (wlan0): new 802.11 WiFi device (driver: 'rtl8192cu' ifindex: 3)
Jun 11 16:31:17 Salon kernel: [ 64.921031] rtl8192cu: MAC auto ON okay!
Jun 11 16:31:17 Salon kernel: [ 64.953728] rtl8192cu: Tx queue select: 0x05
Jun 11 16:33:00 Salon kernel: [ 167.951350] rtl8192cu: MAC auto ON okay!
Jun 11 16:33:00 Salon kernel: [ 167.984049] rtl8192cu: Tx queue select: 0x05
Jun 11 16:35:11 Salon kernel: [ 16.741271] rtl8192cu: Chip version 0x10
Jun 11 16:35:11 Salon kernel: [ 16.823337] rtl8192cu: MAC address: c4:3d:c7:7f:2e:c3
Jun 11 16:35:11 Salon kernel: [ 16.823347] rtl8192cu: Board Type 0
Jun 11 16:35:11 Salon kernel: [ 16.823641] rtl8192cu: Loading firmware rtlwifi/rtl8192cufw.bin
Jun 11 16:35:11 Salon kernel: [ 16.823761] usbcore: registered new interface driver rtl8192cu
Jun 11 16:35:11 Salon kernel: [ 18.505198] Error: Driver 'rtl8192cu' is already registered, aborting...
Jun 11 16:35:12 Salon NetworkManager[746]: <info> (wlan0): new 802.11 WiFi device (driver: 'rtl8192cu' ifindex: 3)
Jun 11 16:35:12 Salon kernel: [ 29.793299] rtl8192cu: MAC auto ON okay!
Jun 11 16:35:12 Salon kernel: [ 29.829747] rtl8192cu: Tx queue select: 0x05
Jun 11 16:40:52 Salon kernel: [ 369.576566] Error: Driver 'rtl8192cu' is already registered, aborting...
Jun 11 16:42:02 Salon kernel: [ 439.305684] Error: Driver 'rtl8192cu' is already registered, aborting...
Jun 11 16:42:06 Salon kernel: [ 442.691162] Error: Driver 'rtl8192cu' is already registered, aborting...
Jun 11 16:42:09 Salon kernel: [ 445.743295] Error: Driver 'rtl8192cu' is already registered, aborting...
Jun 11 16:42:12 Salon kernel: [ 449.267438] rtl8192cu: Chip version 0x10
Jun 11 16:42:12 Salon kernel: [ 449.349527] rtl8192cu: MAC address: c4:3d:c7:7f:2e:c3
Jun 11 16:42:12 Salon kernel: [ 449.349537] rtl8192cu: Board Type 0
Jun 11 16:42:12 Salon kernel: [ 449.349853] rtl8192cu: Loading firmware rtlwifi/rtl8192cufw.bin
Jun 11 16:42:12 Salon NetworkManager[746]: <info> (wlan0): new 802.11 WiFi device (driver: 'rtl8192cu' ifindex: 5)
Jun 11 16:42:12 Salon kernel: [ 449.448579] rtl8192cu: MAC auto ON okay!
Jun 11 16:42:12 Salon kernel: [ 449.481401] rtl8192cu: Tx queue select: 0x05
Jun 11 16:42:25 Salon kernel: [ 461.878835] Error: Driver 'rtl8192cu' is already registered, aborting...
Jun 11 16:47:00 Salon kernel: [ 736.038461] Error: Driver 'rtl8192cu' is already registered, aborting...
Jun 11 16:52:54 Salon kernel: [ 1089.548862] rtl8192cu: MAC auto ON okay!
Jun 11 16:52:54 Salon kernel: [ 1089.581683] rtl8192cu: Tx queue select: 0x05
Jun 11 17:40:19 Salon kernel: [ 3929.544436] rtl8192cu: Chip version 0x10
Jun 11 17:40:19 Salon kernel: [ 3929.626273] rtl8192cu: MAC address: c4:3d:c7:7f:2e:c3
Jun 11 17:40:19 Salon kernel: [ 3929.626281] rtl8192cu: Board Type 0
Jun 11 17:40:19 Salon kernel: [ 3929.626640] rtl8192cu: Loading firmware rtlwifi/rtl8192cufw.bin
Jun 11 17:40:19 Salon NetworkManager[746]: <info> (wlan0): new 802.11 WiFi device (driver: 'rtl8192cu' ifindex: 6)
Jun 11 17:40:19 Salon kernel: [ 3929.720011] rtl8192cu: MAC auto ON okay!
Jun 11 17:40:19 Salon kernel: [ 3929.754030] rtl8192cu: Tx queue select: 0x05
Jun 11 17:41:50 Salon kernel: [ 4020.959400] rtl8192cu: Chip version 0x10
Jun 11 17:41:50 Salon kernel: [ 4021.041495] rtl8192cu: MAC address: c4:3d:c7:7f:2e:c3
Jun 11 17:41:50 Salon kernel: [ 4021.041505] rtl8192cu: Board Type 0
Jun 11 17:41:50 Salon kernel: [ 4021.041812] rtl8192cu: Loading firmware rtlwifi/rtl8192cufw.bin
Jun 11 17:41:50 Salon NetworkManager[746]: <info> (wlan0): new 802.11 WiFi device (driver: 'rtl8192cu' ifindex: 7)
Jun 11 17:41:54 Salon kernel: [ 4024.752666] rtl8192cu: MAC auto ON okay!
Jun 11 17:41:54 Salon kernel: [ 4024.785363] rtl8192cu: Tx queue select: 0x05
Jun 11 17:42:47 Salon kernel: [ 4077.557765] rtl8192cu: MAC auto ON okay!
Jun 11 17:42:47 Salon kernel: [ 4077.590587] rtl8192cu: Tx queue select: 0x05
Jun 11 17:43:03 Salon kernel: [ 4093.708933] rtl8192cu: MAC auto ON okay!
Jun 11 17:43:03 Salon kernel: [ 4093.741637] rtl8192cu: Tx queue select: 0x05
Jun 11 17:44:06 Salon kernel: [ 4156.273864] rtl8192cu: MAC auto ON okay!
Jun 11 17:44:06 Salon kernel: [ 4156.306555] rtl8192cu: Tx queue select: 0x05
Jun 11 17:44:07 Salon kernel: [ 4157.513703] rtl8192cu: MAC auto ON okay!
Jun 11 17:44:07 Salon kernel: [ 4157.546403] rtl8192cu: Tx queue select: 0x05
Jun 11 17:44:22 Salon kernel: [ 4172.642351] Error: Driver 'rtl8192cu' is already registered, aborting...
Jun 11 17:51:00 Salon kernel: [ 4569.277547] rtl8192cu: MAC auto ON okay!
Jun 11 17:51:00 Salon kernel: [ 4569.311380] rtl8192cu: Tx queue select: 0x05
Jun 11 18:14:19 Salon kernel: [ 5966.280108] rtl8192cu: Chip version 0x10
Jun 11 18:14:19 Salon kernel: [ 5966.362202] rtl8192cu: MAC address: c4:3d:c7:7f:2e:c3
Jun 11 18:14:19 Salon kernel: [ 5966.362210] rtl8192cu: Board Type 0
Jun 11 18:14:19 Salon kernel: [ 5966.362525] rtl8192cu: Loading firmware rtlwifi/rtl8192cufw.bin
Jun 11 18:14:19 Salon kernel: [ 5966.456140] rtl8192cu: MAC auto ON okay!
Jun 11 18:14:19 Salon NetworkManager[746]: <info> (wlan0): new 802.11 WiFi device (driver: 'rtl8192cu' ifindex: 8)
Jun 11 18:14:19 Salon kernel: [ 5966.489087] rtl8192cu: Tx queue select: 0x05
et rfkill (qui n'était pas installé, c'est un PC fixe)
$ rfkill list
5: phy5: Wireless LAN
Soft blocked: no
Hard blocked: no