Hi Brad,

I don't know what happened exactly but there's something that break wifi
connectivity with newest kernel versions.

For example with other hardware:

 *-network
       description: Wireless interface
       product: WiFi Link 5100
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: wlan0
       version: 00
       serial: 00:21:5d:ec:ac:14
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical 
wireless
       configuration: broadcast=yes driver=iwlwifi 
driverversion=3.5.0-25-generic firmware=8.83.5.1 build 33692 ip=192.168.90.101 
latency=0 link=yes multicast=yes wireless=IEEE 802.11abgn
       resources: irq:45 memory:febfe000-febfffff

Distributor ID: Ubuntu
Description:    Ubuntu 12.10
Release:        12.10
Codename:       quantal


It's impossible to use the wifi under kernel: 3.5.0-27.46, 3.5.0-28.48. As you 
can see on the logs:

May  9 12:40:53 luna wpa_supplicant[1409]: wlan0: SME: Trying to authenticate 
with XX:XX:XX:XX:XX:XX (SSID='Octi' freq=2472 MHz)
May  9 12:40:53 luna kernel: [   35.781358] wlan0: authenticate with 
XX:XX:XX:XX:XX:XX
May  9 12:40:53 luna kernel: [   35.784947] iwlwifi 0000:03:00.0: Microcode SW 
error detected.  Restarting 0x2000000.
May  9 12:40:53 luna kernel: [   35.784954] iwlwifi 0000:03:00.0: CSR values:
May  9 12:40:53 luna kernel: [   35.784958] iwlwifi 0000:03:00.0: (2nd byte of 
CSR_INT_COALESCING is CSR_INT_PERIODIC_REG)
May  9 12:40:53 luna kernel: [   35.784965] iwlwifi 0000:03:00.0:        
CSR_HW_IF_CONFIG_REG: 0X00488704
May  9 12:40:53 luna kernel: [   35.784972] iwlwifi 0000:03:00.0:          
CSR_INT_COALESCING: 0X0000ff40
May  9 12:40:53 luna kernel: [   35.784978] iwlwifi 0000:03:00.0:               
      CSR_INT: 0X00000000
May  9 12:40:53 luna kernel: [   35.784985] iwlwifi 0000:03:00.0:               
 CSR_INT_MASK: 0X00000000
May  9 12:40:53 luna kernel: [   35.784992] iwlwifi 0000:03:00.0:           
CSR_FH_INT_STATUS: 0X00000000
May  9 12:40:53 luna kernel: [   35.784998] iwlwifi 0000:03:00.0:               
  CSR_GPIO_IN: 0X00000000
May  9 12:40:53 luna kernel: [   35.785005] iwlwifi 0000:03:00.0:               
    CSR_RESET: 0X00000000
May  9 12:40:53 luna kernel: [   35.785011] iwlwifi 0000:03:00.0:               
 CSR_GP_CNTRL: 0X080403c5
May  9 12:40:53 luna kernel: [   35.785018] iwlwifi 0000:03:00.0:               
   CSR_HW_REV: 0X00000054
May  9 12:40:53 luna kernel: [   35.785025] iwlwifi 0000:03:00.0:              
CSR_EEPROM_REG: 0X00000000
May  9 12:40:53 luna kernel: [   35.785031] iwlwifi 0000:03:00.0:               
CSR_EEPROM_GP: 0X90000004
May  9 12:40:53 luna kernel: [   35.785038] iwlwifi 0000:03:00.0:              
CSR_OTP_GP_REG: 0X00060000
May  9 12:40:53 luna kernel: [   35.785044] iwlwifi 0000:03:00.0:               
  CSR_GIO_REG: 0X00080044
May  9 12:40:53 luna kernel: [   35.785051] iwlwifi 0000:03:00.0:            
CSR_GP_UCODE_REG: 0X000007b8
May  9 12:40:53 luna kernel: [   35.785058] iwlwifi 0000:03:00.0:           
CSR_GP_DRIVER_REG: 0X00000000
May  9 12:40:53 luna kernel: [   35.785064] iwlwifi 0000:03:00.0:           
CSR_UCODE_DRV_GP1: 0X00000000
May  9 12:40:53 luna kernel: [   35.785071] iwlwifi 0000:03:00.0:           
CSR_UCODE_DRV_GP2: 0X00000000
May  9 12:40:53 luna kernel: [   35.785077] iwlwifi 0000:03:00.0:               
  CSR_LED_REG: 0X00000058
May  9 12:40:53 luna kernel: [   35.785084] iwlwifi 0000:03:00.0:        
CSR_DRAM_INT_TBL_REG: 0X8806ff2b
May  9 12:40:53 luna kernel: [   35.785091] iwlwifi 0000:03:00.0:        
CSR_GIO_CHICKEN_BITS: 0X27800200
May  9 12:40:53 luna kernel: [   35.785097] iwlwifi 0000:03:00.0:             
CSR_ANA_PLL_CFG: 0X00880300
May  9 12:40:53 luna kernel: [   35.785104] iwlwifi 0000:03:00.0:           
CSR_HW_REV_WA_REG: 0X0001001a
May  9 12:40:53 luna kernel: [   35.785111] iwlwifi 0000:03:00.0:        
CSR_DBG_HPET_MEM_REG: 0Xffff0000
May  9 12:40:53 luna kernel: [   35.785114] iwlwifi 0000:03:00.0: FH register 
values:
May  9 12:40:53 luna kernel: [   35.785131] iwlwifi 0000:03:00.0:         
FH_RSCSR_CHNL0_STTS_WPTR_REG: 0X07307000
May  9 12:40:53 luna kernel: [   35.785146] iwlwifi 0000:03:00.0:        
FH_RSCSR_CHNL0_RBDCB_BASE_REG: 0X0072b7d0
May  9 12:40:53 luna kernel: [   35.785161] iwlwifi 0000:03:00.0:               
   FH_RSCSR_CHNL0_WPTR: 0X00000058
May  9 12:40:53 luna kernel: [   35.785176] iwlwifi 0000:03:00.0:         
FH_MEM_RCSR_CHNL0_CONFIG_REG: 0X80811104
May  9 12:40:53 luna kernel: [   35.785191] iwlwifi 0000:03:00.0:          
FH_MEM_RSSR_SHARED_CTRL_REG: 0X000000fc
May  9 12:40:53 luna kernel: [   35.785206] iwlwifi 0000:03:00.0:            
FH_MEM_RSSR_RX_STATUS_REG: 0X07030000
May  9 12:40:53 luna kernel: [   35.785221] iwlwifi 0000:03:00.0:    
FH_MEM_RSSR_RX_ENABLE_ERR_IRQ2DRV: 0X00000000
May  9 12:40:53 luna kernel: [   35.785237] iwlwifi 0000:03:00.0:               
 FH_TSSR_TX_STATUS_REG: 0X07ff0001
May  9 12:40:53 luna kernel: [   35.785252] iwlwifi 0000:03:00.0:               
  FH_TSSR_TX_ERROR_REG: 0X00000000
May  9 12:40:53 luna kernel: [   35.785256] iwlwifi 0000:03:00.0: Loaded 
firmware version: 8.83.5.1 build 33692
May  9 12:40:53 luna kernel: [   35.785371] iwlwifi 0000:03:00.0: Start IWL 
Error Log Dump:
May  9 12:40:53 luna kernel: [   35.785375] iwlwifi 0000:03:00.0: Status: 
0x0000004C, count: 5
May  9 12:40:53 luna kernel: [   35.785379] iwlwifi 0000:03:00.0: 0x00000005 | 
SYSASSERT
May  9 12:40:53 luna kernel: [   35.785383] iwlwifi 0000:03:00.0: 0x0001DFB0 | 
uPc
May  9 12:40:53 luna kernel: [   35.785386] iwlwifi 0000:03:00.0: 0x0001DF94 | 
branchlink1
May  9 12:40:53 luna kernel: [   35.785390] iwlwifi 0000:03:00.0: 0x0001DF94 | 
branchlink2
May  9 12:40:53 luna kernel: [   35.785393] iwlwifi 0000:03:00.0: 0x00000916 | 
interruptlink1
May  9 12:40:53 luna kernel: [   35.785397] iwlwifi 0000:03:00.0: 0x00000000 | 
interruptlink2
May  9 12:40:53 luna kernel: [   35.785400] iwlwifi 0000:03:00.0: 0x000001FB | 
data1
May  9 12:40:53 luna kernel: [   35.785403] iwlwifi 0000:03:00.0: 0x00000009 | 
data2
May  9 12:40:53 luna kernel: [   35.785407] iwlwifi 0000:03:00.0: 0x000001FB | 
line
May  9 12:40:53 luna kernel: [   35.785410] iwlwifi 0000:03:00.0: 0x00018265 | 
beacon time
May  9 12:40:53 luna kernel: [   35.785414] iwlwifi 0000:03:00.0: 0x00000D9B | 
tsf low
May  9 12:40:53 luna kernel: [   35.785417] iwlwifi 0000:03:00.0: 0x00000000 | 
tsf hi
May  9 12:40:53 luna kernel: [   35.785421] iwlwifi 0000:03:00.0: 0x00000000 | 
time gp1
May  9 12:40:53 luna kernel: [   35.785424] iwlwifi 0000:03:00.0: 0x006326D9 | 
time gp2
May  9 12:40:53 luna kernel: [   35.785428] iwlwifi 0000:03:00.0: 0x00000000 | 
time gp3
May  9 12:40:53 luna kernel: [   35.785431] iwlwifi 0000:03:00.0: 0x00010853 | 
uCode version
May  9 12:40:53 luna kernel: [   35.785435] iwlwifi 0000:03:00.0: 0x00000054 | 
hw version
May  9 12:40:53 luna kernel: [   35.785438] iwlwifi 0000:03:00.0: 0x00488704 | 
board version
May  9 12:40:53 luna kernel: [   35.785442] iwlwifi 0000:03:00.0: 0x04280010 | 
hcmd
May  9 12:40:53 luna kernel: [   35.785445] iwlwifi 0000:03:00.0: 0x00022080 | 
isr0
May  9 12:40:53 luna kernel: [   35.785448] iwlwifi 0000:03:00.0: 0x0103E000 | 
isr1
May  9 12:40:53 luna kernel: [   35.785452] iwlwifi 0000:03:00.0: 0x00000002 | 
isr2
May  9 12:40:53 luna kernel: [   35.785455] iwlwifi 0000:03:00.0: 0x0041FCC0 | 
isr3
May  9 12:40:53 luna kernel: [   35.785459] iwlwifi 0000:03:00.0: 0x01000112 | 
isr4
May  9 12:40:53 luna kernel: [   35.785462] iwlwifi 0000:03:00.0: 0x00017D3C | 
isr_pref
May  9 12:40:53 luna kernel: [   35.785466] iwlwifi 0000:03:00.0: 0x00000050 | 
wait_event
May  9 12:40:53 luna kernel: [   35.785469] iwlwifi 0000:03:00.0: 0x0000003C | 
l2p_control
May  9 12:40:53 luna kernel: [   35.785473] iwlwifi 0000:03:00.0: 0x0000003F | 
l2p_duration
May  9 12:40:53 luna kernel: [   35.785477] iwlwifi 0000:03:00.0: 0x00101040 | 
l2p_mhvalid
May  9 12:40:53 luna kernel: [   35.785480] iwlwifi 0000:03:00.0: 0x00000005 | 
l2p_addr_match
May  9 12:40:53 luna kernel: [   35.785483] iwlwifi 0000:03:00.0: 0x02121704 | 
lmpm_pmg_sel
May  9 12:40:53 luna kernel: [   35.785487] iwlwifi 0000:03:00.0: 0x00005868 | 
timestamp
May  9 12:40:53 luna kernel: [   35.785491] iwlwifi 0000:03:00.0: 0x00000100 | 
flow_handler
May  9 12:40:53 luna kernel: [   35.785545] iwlwifi 0000:03:00.0: Start IWL 
Event Log Dump: display last 20 entries
May  9 12:40:53 luna kernel: [   35.785565] iwlwifi 0000:03:00.0: 
EVT_LOGT:0006494688:0x00000005:0484
May  9 12:40:53 luna kernel: [   35.785578] iwlwifi 0000:03:00.0: 
EVT_LOGT:0006494692:0x00000006:0484
May  9 12:40:53 luna kernel: [   35.785590] iwlwifi 0000:03:00.0: 
EVT_LOGT:0006494697:0x00000007:0484
May  9 12:40:53 luna kernel: [   35.785603] iwlwifi 0000:03:00.0: 
EVT_LOGT:0006494701:0x00000008:0484
May  9 12:40:53 luna kernel: [   35.785615] iwlwifi 0000:03:00.0: 
EVT_LOGT:0006494706:0x0000000d:0484
May  9 12:40:53 luna kernel: [   35.785627] iwlwifi 0000:03:00.0: 
EVT_LOGT:0006494711:0x0000000e:0484
May  9 12:40:53 luna kernel: [   35.785640] iwlwifi 0000:03:00.0: 
EVT_LOGT:0006494715:0x0000000f:0484
May  9 12:40:53 luna kernel: [   35.785652] iwlwifi 0000:03:00.0: 
EVT_LOGT:0006494719:0x00000010:0484
May  9 12:40:53 luna kernel: [   35.785665] iwlwifi 0000:03:00.0: 
EVT_LOGT:0006494725:0x00000015:0484
May  9 12:40:53 luna kernel: [   35.785677] iwlwifi 0000:03:00.0: 
EVT_LOGT:0006494729:0x00000016:0484
May  9 12:40:53 luna kernel: [   35.785690] iwlwifi 0000:03:00.0: 
EVT_LOGT:0006494733:0x00000017:0484
May  9 12:40:53 luna kernel: [   35.785702] iwlwifi 0000:03:00.0: 
EVT_LOGT:0006494738:0x00000018:0484
May  9 12:40:53 luna kernel: [   35.785714] iwlwifi 0000:03:00.0: 
EVT_LOGT:0006494742:0x00000019:0484
May  9 12:40:53 luna kernel: [   35.785727] iwlwifi 0000:03:00.0: 
EVT_LOGT:0006494749:0x00000000:0651
May  9 12:40:53 luna kernel: [   35.785739] iwlwifi 0000:03:00.0: 
EVT_LOGT:0006497656:0x04250018:0401
May  9 12:40:53 luna kernel: [   35.785752] iwlwifi 0000:03:00.0: 
EVT_LOGT:0006497728:0x0426004e:0401
May  9 12:40:53 luna kernel: [   35.785764] iwlwifi 0000:03:00.0: 
EVT_LOGT:0006497993:0x04270048:0401
May  9 12:40:53 luna kernel: [   35.785777] iwlwifi 0000:03:00.0: 
EVT_LOGT:0006498003:0x04280010:0401
May  9 12:40:53 luna kernel: [   35.785789] iwlwifi 0000:03:00.0: 
EVT_LOGT:0006498005:0x0000000d:0451
May  9 12:40:53 luna kernel: [   35.785802] iwlwifi 0000:03:00.0: 
EVT_LOGT:0006498014:0x00000000:0125
May  9 12:40:55 luna kernel: [   37.784053] iwlwifi 0000:03:00.0: Error sending 
REPLY_RXON: time out after 2000ms.
May  9 12:40:55 luna kernel: [   37.784061] iwlwifi 0000:03:00.0: Current CMD 
queue read_ptr 40 write_ptr 41
May  9 12:40:55 luna kernel: [   37.784066] iwlwifi 0000:03:00.0: Error 
clearing ASSOC_MSK on BSS (-110)
May  9 12:40:57 luna wpa_supplicant[1409]: wlan0: SME: Authentication request 
to the driver failed
May  9 12:40:57 luna kernel: [   39.784053] iwlwifi 0000:03:00.0: Error sending 
REPLY_ADD_STA: time out after 2000ms.
May  9 12:40:57 luna kernel: [   39.784060] iwlwifi 0000:03:00.0: Current CMD 
queue read_ptr 40 write_ptr 42
May  9 12:40:57 luna kernel: [   39.784065] iwlwifi 0000:03:00.0: Adding 
station XX:XX:XX:XX:XX:XX failed.
May  9 12:40:57 luna kernel: [   39.784070] iwlwifi 0000:03:00.0: Unable to add 
station XX:XX:XX:XX:XX:XX (-110)
May  9 12:40:57 luna kernel: [   39.784078] wlan0: failed to insert STA entry 
for the AP (error -110)
May  9 12:40:57 luna kernel: [   39.785397] ieee80211 phy0: Hardware restart 
was requested
May  9 12:40:57 luna kernel: [   39.785455] iwlwifi 0000:03:00.0: L1 Disabled; 
Enabling L0S
May  9 12:40:57 luna NetworkManager[1337]: <info> (wlan0): supplicant interface 
state: scanning -> disconnected


This issue is not present on kernel: 3.5.0-25.39

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https://bugs.launchpad.net/bugs/1176812

Title:
  Regression caused by commit df88129

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