linux - deauthenticated from ... (Reason: 7)

On a ThinkPad X230 with this wifi card:

03:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8188CE 802.11b/g/n WiFi Adapter (rev 01) Subsystem: Realtek Semiconductor Co., Ltd. Device 8195 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 64 bytes Interrupt: pin A routed to IRQ 17 Region 0: I/O ports at 4000 [size=256] Region 2: Memory at f1c00000 (64-bit, non-prefetchable) [size=16K] Capabilities: <access denied> Kernel driver in use: rtl8192ce

running Ubuntu 14.04, network access is frequently interrupted and sometimes apparently lost for good until a system reboot. At around the time of the interruption, this appears in the system log:

[458.384] cfg80211: Calling CRDA to update world regulatory domain [458.384] wlan0: authenticate with 00:13:10:ee:af:97 [458.385] wlan0: send auth to 00:13:10:ee:af:97 (try 1/3) [458.389] cfg80211: World regulatory domain updated: [458.389] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp) [458.389] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) [458.389] cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) [458.389] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm) [458.389] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) [458.389] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) [458.390] wlan0: authenticated [458.390] rtl8192ce 0000:03:00.0 wlan0: disabling HT as WMM/QoS is not supported by the AP [458.390] rtl8192ce 0000:03:00.0 wlan0: disabling VHT as WMM/QoS is not supported by the AP [458.391] wlan0: associate with 00:13:10:ee:af:97 (try 1/3) [458.393] wlan0: RX AssocResp from 00:13:10:ee:af:97 (capab=0x401 status=0 aid=3) [458.394] wlan0: associated [984.594] wlan0: deauthenticated from 00:13:10:ee:af:97 (Reason: 7)

The access point is a WRT54GS running Tomato 1.19. I have several other wireless devices around - another laptop, an iPad, an Android phone. There are no other wireless devices in range (no neighbors, no other access points, etc).

The laptop is new (to me), from the first time I opened the lid this was the behavior (iow it didn't start out working properly and then get broken by a system update or something).

I've read that "Reason: 7" is "Class 3 frame received from nonassociated STA". I guess "STA" is short for "station" which maybe is the same kind of thing as an access point. It doesn't seem like this should happen since there are no other access points in range (it is literally (literal sense of "literally") miles to the next access point).

What's up? Can I fix this somehow or is this hardware simply not well supported on Ubuntu 14.04?

STA is short for "station", and technically an AP is a form of STA, but in common usage, STA usually means "non-AP STA", which is to say, "wireless client".

Your "wlan0: deauthenticated from 00:13:10:ee:af:97 (Reason: 7)" log message probably came as a result of your client receiving a DeAuthenticate (or DisAssociate) management frame from the AP. It seems as if the AP is allowing your client to Authenticate and Associate, and then a moment later, when the client starts sending real data traffic ("Class 3 frames"), the AP acts as if the client wasn't associated, and kicks it off the network (deauthenticates it).

An 802.11 monitor-mode, promiscuous-mode packet capture from an independent device could clear this up pretty quickly.

Another thing to try, if it's not to much hassle, would be to put your AP back on the latest vendor firmware and see if the problem happens there, to rule out a bug in Tomato.