I just got a disconnection, here is what syslog has to say about it:
Apr 30 12:53:06 thibauld-desktop wpa_supplicant[815]: message repeated 47 times: [ wlan0: CTRL-EVENT-SCAN-STARTED ] Apr 30 12:54:54 thibauld-desktop wpa_supplicant[815]: wlan0: CTRL-EVENT-DISCONNECTED bssid=cc:35:40:57:80:e1 reason=4 locally_generated=1 Apr 30 12:54:54 thibauld-desktop NetworkManager[699]: <warn> Connection disconnected (reason -4) Apr 30 12:54:54 thibauld-desktop kernel: [14259.692842] cfg80211: Calling CRDA to update world regulatory domain Apr 30 12:54:54 thibauld-desktop kernel: [14259.695285] cfg80211: World regulatory domain updated: Apr 30 12:54:54 thibauld-desktop kernel: [14259.695288] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp) Apr 30 12:54:54 thibauld-desktop kernel: [14259.695290] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) Apr 30 12:54:54 thibauld-desktop kernel: [14259.695292] cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) Apr 30 12:54:54 thibauld-desktop kernel: [14259.695293] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm) Apr 30 12:54:54 thibauld-desktop kernel: [14259.695294] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) Apr 30 12:54:54 thibauld-desktop kernel: [14259.695295] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) Apr 30 12:54:54 thibauld-desktop NetworkManager[699]: <info> (wlan0): supplicant interface state: completed -> disconnected Apr 30 12:54:54 thibauld-desktop wpa_supplicant[815]: wlan0: CTRL-EVENT-SCAN-STARTED Apr 30 12:54:54 thibauld-desktop NetworkManager[699]: <info> (wlan0): supplicant interface state: disconnected -> scanning Apr 30 12:54:58 thibauld-desktop wpa_supplicant[815]: wlan0: SME: Trying to authenticate with cc:35:40:57:80:e1 (SSID='Math Network' freq=2462 MHz) Apr 30 12:54:58 thibauld-desktop kernel: [14263.454497] wlan0: authenticate with cc:35:40:57:80:e1 Apr 30 12:54:58 thibauld-desktop kernel: [14263.456106] wlan0: send auth to cc:35:40:57:80:e1 (try 1/3) Apr 30 12:54:58 thibauld-desktop NetworkManager[699]: <info> (wlan0): supplicant interface state: scanning -> authenticating Apr 30 12:54:58 thibauld-desktop wpa_supplicant[815]: wlan0: Trying to associate with cc:35:40:57:80:e1 (SSID='Math Network' freq=2462 MHz) Apr 30 12:54:58 thibauld-desktop kernel: [14263.460143] wlan0: authenticated Apr 30 12:54:58 thibauld-desktop kernel: [14263.463419] wlan0: associate with cc:35:40:57:80:e1 (try 1/3) Apr 30 12:54:58 thibauld-desktop kernel: [14263.466334] wlan0: RX AssocResp from cc:35:40:57:80:e1 (capab=0x411 status=0 aid=5) Apr 30 12:54:58 thibauld-desktop kernel: [14263.467056] wlan0: associated Apr 30 12:54:58 thibauld-desktop NetworkManager[699]: <info> (wlan0): supplicant interface state: authenticating -> associating Apr 30 12:54:58 thibauld-desktop wpa_supplicant[815]: wlan0: Associated with cc:35:40:57:80:e1 Apr 30 12:54:58 thibauld-desktop NetworkManager[699]: <info> (wlan0): supplicant interface state: associating -> associated Apr 30 12:54:58 thibauld-desktop NetworkManager[699]: <info> (wlan0): supplicant interface state: associated -> 4-way handshake Apr 30 12:54:59 thibauld-desktop wpa_supplicant[815]: wlan0: WPA: Key negotiation completed with cc:35:40:57:80:e1 [PTK=CCMP GTK=TKIP] Apr 30 12:54:59 thibauld-desktop wpa_supplicant[815]: wlan0: CTRL-EVENT-CONNECTED - Connection to cc:35:40:57:80:e1 completed [id=0 id_str=] Apr 30 12:54:59 thibauld-desktop NetworkManager[699]: <info> (wlan0): supplicant interface state: 4-way handshake -> completed Apr 30 12:55:06 thibauld-desktop wpa_supplicant[815]: wlan0: CTRL-EVENT-SCAN-STARTED Apr 30 12:57:40 thibauld-desktop dbus[616]: [system] Activating service name='org.debian.apt' (using servicehelper) Apr 30 12:57:40 thibauld-desktop AptDaemon: INFO: Initializing daemon Apr 30 12:57:40 thibauld-desktop dbus[616]: [system] Successfully activated service 'org.debian.apt' Apr 30 12:57:40 thibauld-desktop AptDaemon.PackageKit: INFO: Initializing PackageKit compat layer Apr 30 12:58:48 thibauld-desktop dbus[616]: [system] Activating service name='org.debian.AptXapianIndex' (using servicehelper) Apr 30 12:58:48 thibauld-desktop dbus[616]: [system] Successfully activated service 'org.debian.AptXapianIndex'
Hope this helps! PS: I forgot to say in my previous comment that my Ubuntu 14.04 runs on a 4th Gen NUC Core i5-4250U D54250WYK
I just got a disconnection, here is what syslog has to say about it:
Apr 30 12:53:06 thibauld-desktop wpa_supplicant[ 815]: message repeated 47 times: [ wlan0: CTRL-EVENT- SCAN-STARTED ] 815]: wlan0: CTRL-EVENT- DISCONNECTED bssid=cc: 35:40:57: 80:e1 reason=4 locally_generated=1 699]: <warn> Connection disconnected (reason -4) 699]: <info> (wlan0): supplicant interface state: completed -> disconnected 815]: wlan0: CTRL-EVENT- SCAN-STARTED 699]: <info> (wlan0): supplicant interface state: disconnected -> scanning 815]: wlan0: SME: Trying to authenticate with cc:35:40:57:80:e1 (SSID='Math Network' freq=2462 MHz) 699]: <info> (wlan0): supplicant interface state: scanning -> authenticating 815]: wlan0: Trying to associate with cc:35:40:57:80:e1 (SSID='Math Network' freq=2462 MHz) 699]: <info> (wlan0): supplicant interface state: authenticating -> associating 815]: wlan0: Associated with cc:35:40:57:80:e1 699]: <info> (wlan0): supplicant interface state: associating -> associated 699]: <info> (wlan0): supplicant interface state: associated -> 4-way handshake 815]: wlan0: WPA: Key negotiation completed with cc:35:40:57:80:e1 [PTK=CCMP GTK=TKIP] 815]: wlan0: CTRL-EVENT- CONNECTED - Connection to cc:35:40:57:80:e1 completed [id=0 id_str=] 699]: <info> (wlan0): supplicant interface state: 4-way handshake -> completed 815]: wlan0: CTRL-EVENT- SCAN-STARTED debian. apt' (using servicehelper) PackageKit: INFO: Initializing PackageKit compat layer debian. AptXapianIndex' (using servicehelper) AptXapianIndex'
Apr 30 12:54:54 thibauld-desktop wpa_supplicant[
Apr 30 12:54:54 thibauld-desktop NetworkManager[
Apr 30 12:54:54 thibauld-desktop kernel: [14259.692842] cfg80211: Calling CRDA to update world regulatory domain
Apr 30 12:54:54 thibauld-desktop kernel: [14259.695285] cfg80211: World regulatory domain updated:
Apr 30 12:54:54 thibauld-desktop kernel: [14259.695288] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
Apr 30 12:54:54 thibauld-desktop kernel: [14259.695290] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
Apr 30 12:54:54 thibauld-desktop kernel: [14259.695292] cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
Apr 30 12:54:54 thibauld-desktop kernel: [14259.695293] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
Apr 30 12:54:54 thibauld-desktop kernel: [14259.695294] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
Apr 30 12:54:54 thibauld-desktop kernel: [14259.695295] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
Apr 30 12:54:54 thibauld-desktop NetworkManager[
Apr 30 12:54:54 thibauld-desktop wpa_supplicant[
Apr 30 12:54:54 thibauld-desktop NetworkManager[
Apr 30 12:54:58 thibauld-desktop wpa_supplicant[
Apr 30 12:54:58 thibauld-desktop kernel: [14263.454497] wlan0: authenticate with cc:35:40:57:80:e1
Apr 30 12:54:58 thibauld-desktop kernel: [14263.456106] wlan0: send auth to cc:35:40:57:80:e1 (try 1/3)
Apr 30 12:54:58 thibauld-desktop NetworkManager[
Apr 30 12:54:58 thibauld-desktop wpa_supplicant[
Apr 30 12:54:58 thibauld-desktop kernel: [14263.460143] wlan0: authenticated
Apr 30 12:54:58 thibauld-desktop kernel: [14263.463419] wlan0: associate with cc:35:40:57:80:e1 (try 1/3)
Apr 30 12:54:58 thibauld-desktop kernel: [14263.466334] wlan0: RX AssocResp from cc:35:40:57:80:e1 (capab=0x411 status=0 aid=5)
Apr 30 12:54:58 thibauld-desktop kernel: [14263.467056] wlan0: associated
Apr 30 12:54:58 thibauld-desktop NetworkManager[
Apr 30 12:54:58 thibauld-desktop wpa_supplicant[
Apr 30 12:54:58 thibauld-desktop NetworkManager[
Apr 30 12:54:58 thibauld-desktop NetworkManager[
Apr 30 12:54:59 thibauld-desktop wpa_supplicant[
Apr 30 12:54:59 thibauld-desktop wpa_supplicant[
Apr 30 12:54:59 thibauld-desktop NetworkManager[
Apr 30 12:55:06 thibauld-desktop wpa_supplicant[
Apr 30 12:57:40 thibauld-desktop dbus[616]: [system] Activating service name='org.
Apr 30 12:57:40 thibauld-desktop AptDaemon: INFO: Initializing daemon
Apr 30 12:57:40 thibauld-desktop dbus[616]: [system] Successfully activated service 'org.debian.apt'
Apr 30 12:57:40 thibauld-desktop AptDaemon.
Apr 30 12:58:48 thibauld-desktop dbus[616]: [system] Activating service name='org.
Apr 30 12:58:48 thibauld-desktop dbus[616]: [system] Successfully activated service 'org.debian.
Hope this helps!
PS: I forgot to say in my previous comment that my Ubuntu 14.04 runs on a 4th Gen NUC Core i5-4250U D54250WYK