I have some more traces with this newer 2.6.27 kernel in the messages log. When RT73 hangs everything seems to work but the connection (network manager indicates an alive connection) is broken. I have to desactivate it and to connect again. Oct 16 07:08:15 Ubuntu-Nicolas kernel: [ 28.720753] firmware: requesting rt73.bin Oct 16 07:08:15 Ubuntu-Nicolas kernel: [ 29.006232] NET: Registered protocol family 17 Oct 16 07:08:20 Ubuntu-Nicolas kernel: [ 33.809669] NET: Registered protocol family 10 Oct 16 07:08:20 Ubuntu-Nicolas kernel: [ 33.810424] lo: Disabled Privacy Extensions Oct 16 07:08:20 Ubuntu-Nicolas kernel: [ 33.811509] ADDRCONF(NETDEV_UP): wlan0: link is not ready Oct 16 07:08:20 Ubuntu-Nicolas pulseaudio[7108]: ltdl-bind-now.c: Failed to find original dlopen loader. Oct 16 07:08:20 Ubuntu-Nicolas pulseaudio[7108]: main.c: setrlimit(RLIMIT_NICE, (31, 31)) failed: Opération non permise Oct 16 07:08:20 Ubuntu-Nicolas pulseaudio[7108]: main.c: setrlimit(RLIMIT_RTPRIO, (9, 9)) failed: Opération non permise Oct 16 07:08:21 Ubuntu-Nicolas pulseaudio[7108]: alsa-util.c: Device hw:1 doesn't support 44100 Hz, changed to 16000 Hz. Oct 16 07:08:21 Ubuntu-Nicolas pulseaudio[7108]: alsa-util.c: Device hw:1 doesn't support 2 channels, changed to 1. Oct 16 07:09:28 Ubuntu-Nicolas kernel: [ 101.547335] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready Oct 16 07:15:34 Ubuntu-Nicolas syslogd 1.5.0#2ubuntu6: restart. Oct 16 07:28:05 Ubuntu-Nicolas -- MARK -- Oct 16 07:48:05 Ubuntu-Nicolas -- MARK -- Oct 16 08:08:05 Ubuntu-Nicolas -- MARK -- Oct 16 08:28:05 Ubuntu-Nicolas -- MARK -- Oct 16 08:31:50 Ubuntu-Nicolas kernel: [ 5043.256845] usb 4-5.2: reset high speed USB device using ehci_hcd and address 6 Oct 16 08:48:05 Ubuntu-Nicolas -- MARK -- Oct 16 09:08:05 Ubuntu-Nicolas -- MARK -- Oct 16 09:12:32 Ubuntu-Nicolas kernel: [ 7485.257260] usb 4-5.2: reset high speed USB device using ehci_hcd and address 6 Oct 16 09:28:05 Ubuntu-Nicolas -- MARK -- Oct 16 09:48:05 Ubuntu-Nicolas -- MARK -- Oct 16 10:08:05 Ubuntu-Nicolas -- MARK -- Oct 16 10:28:05 Ubuntu-Nicolas -- MARK -- Oct 16 10:48:05 Ubuntu-Nicolas -- MARK -- Oct 16 11:08:05 Ubuntu-Nicolas -- MARK -- Oct 16 11:28:05 Ubuntu-Nicolas -- MARK -- Oct 16 11:48:05 Ubuntu-Nicolas -- MARK -- Oct 16 12:08:05 Ubuntu-Nicolas -- MARK -- Oct 16 12:28:05 Ubuntu-Nicolas -- MARK -- Oct 16 12:33:44 Ubuntu-Nicolas kernel: [19557.259031] usb 4-5.2: reset high speed USB device using ehci_hcd and address 6 Oct 16 12:48:05 Ubuntu-Nicolas -- MARK -- Oct 16 13:08:05 Ubuntu-Nicolas -- MARK -- Oct 16 13:28:05 Ubuntu-Nicolas -- MARK -- Oct 16 13:48:05 Ubuntu-Nicolas -- MARK -- Oct 16 14:08:05 Ubuntu-Nicolas -- MARK -- Oct 16 14:28:05 Ubuntu-Nicolas -- MARK -- Oct 16 14:48:05 Ubuntu-Nicolas -- MARK -- Oct 16 15:08:05 Ubuntu-Nicolas -- MARK -- Oct 16 15:28:05 Ubuntu-Nicolas -- MARK -- Oct 16 15:48:05 Ubuntu-Nicolas -- MARK -- Oct 16 16:08:05 Ubuntu-Nicolas -- MARK -- Oct 16 16:28:05 Ubuntu-Nicolas -- MARK -- Oct 16 16:48:05 Ubuntu-Nicolas -- MARK -- Oct 16 17:08:05 Ubuntu-Nicolas -- MARK -- Oct 16 17:28:05 Ubuntu-Nicolas -- MARK -- Oct 16 17:42:40 Ubuntu-Nicolas kernel: [38093.253747] usb 4-5.2: reset high speed USB device using ehci_hcd and address 6 Oct 16 18:08:05 Ubuntu-Nicolas -- MARK -- Oct 16 18:28:05 Ubuntu-Nicolas -- MARK -- Oct 16 18:38:39 Ubuntu-Nicolas kernel: [41452.341682] ADDRCONF(NETDEV_UP): wlan0: link is not ready Oct 16 18:38:55 Ubuntu-Nicolas kernel: [41468.670093] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready Oct 16 18:41:33 Ubuntu-Nicolas kernel: [41627.069759] ADDRCONF(NETDEV_UP): wlan0: link is not ready Oct 16 18:41:40 Ubuntu-Nicolas kernel: [41633.662468] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready