even with the backport kernel, connecttion will lost periodically
[16546.340324] iwlagn 0000:03:00.0: Error sending REPLY_SCAN_CMD: time out after 500ms.
[16548.841932] No probe response from AP 00:21:29:8d:8b:aa after 500ms, disconnecting.
[16549.470067] iwlagn 0000:03:00.0: Error sending REPLY_RXON: time out after 500ms.
[16549.470078] iwlagn 0000:03:00.0: Error setting new RXON (-110)
[16549.970078] iwlagn 0000:03:00.0: Error sending REPLY_SCAN_CMD: time out after 500ms.
[16549.970729] wlan0: direct probe to AP 00:21:29:8d:8b:aa (try 1)
[16550.171187] wlan0: direct probe to AP 00:21:29:8d:8b:aa (try 2)
[16550.370070] wlan0: direct probe to AP 00:21:29:8d:8b:aa (try 3)
[16550.470062] iwlagn 0000:03:00.0: Error sending REPLY_RXON: time out after 500ms.
[16550.470074] iwlagn 0000:03:00.0: Error setting new RXON (-110)
[16550.570068] wlan0: direct probe to AP 00:21:29:8d:8b:aa timed out
[16551.070061] iwlagn 0000:03:00.0: Error sending REPLY_RXON: time out after 500ms.
[16551.070072] iwlagn 0000:03:00.0: Error setting new RXON (-110)
[16560.480072] iwlagn 0000:03:00.0: Error sending REPLY_RXON: time out after 500ms.
[16560.480083] iwlagn 0000:03:00.0: Error setting new RXON (-110)
[16560.981672] iwlagn 0000:03:00.0: Error sending REPLY_SCAN_CMD: time out after 500ms.
[16561.480084] iwlagn 0000:03:00.0: Error sending REPLY_RXON: time out after 500ms.
[16561.480095] iwlagn 0000:03:00.0: Error setting new RXON (-110)
[16561.980072] iwlagn 0000:03:00.0: Error sending REPLY_RXON: time out after 500ms.
[16561.980083] iwlagn 0000:03:00.0: Error setting new RXON (-110)
[16566.480182] iwlagn 0000:03:00.0: Error sending REPLY_RXON: time out after 500ms.
[16566.480194] iwlagn 0000:03:00.0: Error setting new RXON (-110)
[16566.981368] iwlagn 0000:03:00.0: Error sending REPLY_SCAN_CMD: time out after 500ms.
[16567.480065] iwlagn 0000:03:00.0: Error sending REPLY_RXON: time out after 500ms.
[16567.480076] iwlagn 0000:03:00.0: Error setting new RXON (-110)
[16567.980075] iwlagn 0000:03:00.0: Error sending REPLY_RXON: time out after 500ms.
[16567.980086] iwlagn 0000:03:00.0: Error setting new RXON (-110)
[16572.480078] iwlagn 0000:03:00.0: Error sending REPLY_RXON: time out after 500ms.
[16572.480089] iwlagn 0000:03:00.0: Error setting new RXON (-110)
[16572.984945] iwlagn 0000:03:00.0: Error sending REPLY_SCAN_CMD: time out after 500ms.
[16573.480071] iwlagn 0000:03:00.0: Error sending REPLY_RXON: time out after 500ms.
[16573.480083] iwlagn 0000:03:00.0: Error setting new RXON (-110)
[16573.980074] iwlagn 0000:03:00.0: Error sending REPLY_RXON: time out after 500ms.
[16573.980086] iwlagn 0000:03:00.0: Error setting new RXON (-110)
[16578.490087] iwlagn 0000:03:00.0: Error sending REPLY_RXON: time out after 500ms.
[16578.490098] iwlagn 0000:03:00.0: Error setting new RXON (-110)
[16578.990052] iwlagn 0000:03:00.0: Error sending REPLY_SCAN_CMD: time out after 500ms.
[16578.990078] iwlagn 0000:03:00.0: No space for Tx
[16578.990084] iwlagn 0000:03:00.0: Error sending REPLY_RXON: enqueue_hcmd failed: -28
[16578.990090] iwlagn 0000:03:00.0: Error setting new RXON (-28)
[16578.990097] iwlagn 0000:03:00.0: No space for Tx
[16578.990103] iwlagn 0000:03:00.0: Error sending REPLY_RXON: enqueue_hcmd failed: -28
[16578.990108] iwlagn 0000:03:00.0: Error setting new RXON (-28)
[16578.990122] iwlagn 0000:03:00.0: No space for Tx
[16578.990127] iwlagn 0000:03:00.0: Error sending REPLY_TX_POWER_DBM_CMD: enqueue_hcmd failed: -28
[16582.064988] iwlagn 0000:03:00.0: PCI INT A disabled