Open bug in launchpad.net : https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1495124 dmesg: [ 1739.516411] iwlwifi 0000:01:00.0: Microcode SW error detected. Restarting 0x2000000. [ 1739.516426] iwlwifi 0000:01:00.0: CSR values: [ 1739.516435] iwlwifi 0000:01:00.0: (2nd byte of CSR_INT_COALESCING is CSR_INT_PERIODIC_REG) [ 1739.516447] iwlwifi 0000:01:00.0: CSR_HW_IF_CONFIG_REG: 0X00484b00 [ 1739.516458] iwlwifi 0000:01:00.0: CSR_INT_COALESCING: 0X0000ff40 [ 1739.516469] iwlwifi 0000:01:00.0: CSR_INT: 0X00000000 [ 1739.516479] iwlwifi 0000:01:00.0: CSR_INT_MASK: 0X00000000 [ 1739.516491] iwlwifi 0000:01:00.0: CSR_FH_INT_STATUS: 0X00000000 [ 1739.516502] iwlwifi 0000:01:00.0: CSR_GPIO_IN: 0X00000038 [ 1739.516513] iwlwifi 0000:01:00.0: CSR_RESET: 0X00000000 [ 1739.516525] iwlwifi 0000:01:00.0: CSR_GP_CNTRL: 0X080403c5 [ 1739.516537] iwlwifi 0000:01:00.0: CSR_HW_REV: 0X000000b0 [ 1739.516549] iwlwifi 0000:01:00.0: CSR_EEPROM_REG: 0Xc4540ffd [ 1739.516561] iwlwifi 0000:01:00.0: CSR_EEPROM_GP: 0X90000801 [ 1739.516572] iwlwifi 0000:01:00.0: CSR_OTP_GP_REG: 0X00030001 [ 1739.516583] iwlwifi 0000:01:00.0: CSR_GIO_REG: 0X00080044 [ 1739.516594] iwlwifi 0000:01:00.0: CSR_GP_UCODE_REG: 0X0000f3ad [ 1739.516605] iwlwifi 0000:01:00.0: CSR_GP_DRIVER_REG: 0X00000000 [ 1739.516617] iwlwifi 0000:01:00.0: CSR_UCODE_DRV_GP1: 0X00000000 [ 1739.516628] iwlwifi 0000:01:00.0: CSR_UCODE_DRV_GP2: 0X00000000 [ 1739.516639] iwlwifi 0000:01:00.0: CSR_LED_REG: 0X00000040 [ 1739.516651] iwlwifi 0000:01:00.0: CSR_DRAM_INT_TBL_REG: 0X880c9dea [ 1739.516662] iwlwifi 0000:01:00.0: CSR_GIO_CHICKEN_BITS: 0X27800200 [ 1739.516674] iwlwifi 0000:01:00.0: CSR_ANA_PLL_CFG: 0X00000000 [ 1739.516685] iwlwifi 0000:01:00.0: CSR_MONITOR_STATUS_REG: 0X43f7ff57 [ 1739.516697] iwlwifi 0000:01:00.0: CSR_HW_REV_WA_REG: 0X0001001a [ 1739.516708] iwlwifi 0000:01:00.0: CSR_DBG_HPET_MEM_REG: 0Xffff0000 [ 1739.516716] iwlwifi 0000:01:00.0: FH register values: [ 1739.516739] iwlwifi 0000:01:00.0: FH_RSCSR_CHNL0_STTS_WPTR_REG: 0X0c9e4600 [ 1739.516760] iwlwifi 0000:01:00.0: FH_RSCSR_CHNL0_RBDCB_BASE_REG: 0X00c9e440 [ 1739.516781] iwlwifi 0000:01:00.0: FH_RSCSR_CHNL0_WPTR: 0X000000e0 [ 1739.516802] iwlwifi 0000:01:00.0: FH_MEM_RCSR_CHNL0_CONFIG_REG: 0X80801114 [ 1739.516822] iwlwifi 0000:01:00.0: FH_MEM_RSSR_SHARED_CTRL_REG: 0X000000fc [ 1739.516843] iwlwifi 0000:01:00.0: FH_MEM_RSSR_RX_STATUS_REG: 0X07030000 [ 1739.516864] iwlwifi 0000:01:00.0: FH_MEM_RSSR_RX_ENABLE_ERR_IRQ2DRV: 0X00000000 [ 1739.516885] iwlwifi 0000:01:00.0: FH_TSSR_TX_STATUS_REG: 0X07ff0001 [ 1739.516906] iwlwifi 0000:01:00.0: FH_TSSR_TX_ERROR_REG: 0X00000000 [ 1739.516916] iwlwifi 0000:01:00.0: Loaded firmware version: 18.168.6.1 [ 1739.517047] iwlwifi 0000:01:00.0: Start IWL Error Log Dump: [ 1739.517055] iwlwifi 0000:01:00.0: Status: 0x000002CC, count: 6 [ 1739.517063] iwlwifi 0000:01:00.0: 0x0000198A | ADVANCED_SYSASSERT [ 1739.517070] iwlwifi 0000:01:00.0: 0x00015920 | uPc [ 1739.517076] iwlwifi 0000:01:00.0: 0x00015910 | branchlink1 [ 1739.517082] iwlwifi 0000:01:00.0: 0x00015910 | branchlink2 [ 1739.517088] iwlwifi 0000:01:00.0: 0x0000DBEA | interruptlink1 [ 1739.517094] iwlwifi 0000:01:00.0: 0x00000000 | interruptlink2 [ 1739.517100] iwlwifi 0000:01:00.0: 0x00000457 | data1 [ 1739.517107] iwlwifi 0000:01:00.0: 0x00000001 | data2 [ 1739.517114] iwlwifi 0000:01:00.0: 0x000001DC | line [ 1739.517121] iwlwifi 0000:01:00.0: 0x8080E6B3 | beacon time [ 1739.517127] iwlwifi 0000:01:00.0: 0x6723C94D | tsf low [ 1739.517134] iwlwifi 0000:01:00.0: 0x00000000 | tsf hi [ 1739.517141] iwlwifi 0000:01:00.0: 0x00000000 | time gp1 [ 1739.517147] iwlwifi 0000:01:00.0: 0x672BAF8D | time gp2 [ 1739.517154] iwlwifi 0000:01:00.0: 0x00000000 | time gp3 [ 1739.517161] iwlwifi 0000:01:00.0: 0x754312A8 | uCode version [ 1739.517168] iwlwifi 0000:01:00.0: 0x000000B0 | hw version [ 1739.517176] iwlwifi 0000:01:00.0: 0x00484B00 | board version [ 1739.517183] iwlwifi 0000:01:00.0: 0x0000001C | hcmd [ 1739.517190] iwlwifi 0000:01:00.0: 0x2F863000 | isr0 [ 1739.517198] iwlwifi 0000:01:00.0: 0x1189F800 | isr1 [ 1739.517205] iwlwifi 0000:01:00.0: 0x00000E02 | isr2 [ 1739.517212] iwlwifi 0000:01:00.0: 0x0543FCC2 | isr3 [ 1739.517220] iwlwifi 0000:01:00.0: 0x00000000 | isr4 [ 1739.517228] iwlwifi 0000:01:00.0: 0x00800110 | isr_pref [ 1739.517235] iwlwifi 0000:01:00.0: 0x000260A4 | wait_event [ 1739.517243] iwlwifi 0000:01:00.0: 0x000000B4 | l2p_control [ 1739.517250] iwlwifi 0000:01:00.0: 0x00001A98 | l2p_duration [ 1739.517258] iwlwifi 0000:01:00.0: 0x0000000F | l2p_mhvalid [ 1739.517266] iwlwifi 0000:01:00.0: 0x00000000 | l2p_addr_match [ 1739.517273] iwlwifi 0000:01:00.0: 0x00000005 | lmpm_pmg_sel [ 1739.517280] iwlwifi 0000:01:00.0: 0x13011136 | timestamp [ 1739.517288] iwlwifi 0000:01:00.0: 0x0000E0F0 | flow_handler [ 1739.517352] iwlwifi 0000:01:00.0: Start IWL Event Log Dump: nothing in log
No.... not again...