Hello, I have an Intel 8265 card in my XPS 13 and I experience a lot of dropped packets when I'm connected to a wide Wifi (width is 80). The following debug info were captured on Kernel 4.11.8 patched with Zen. But I have the same problem on latest 4.11.9. This does not happend if I change the width of the wifi down to 40 from 80. relevant lspci -vvv: 3a:00.0 Network controller: Intel Corporation Wireless 8265 / 8275 (rev 78) Subsystem: Intel Corporation Dual Band Wireless-AC 8265 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 Interrupt: pin A routed to IRQ 291 Region 0: Memory at dc200000 (64-bit, non-prefetchable) [size=8K] Capabilities: <access denied> Kernel driver in use: iwlwifi Kernel modules: iwlwifi $ modinfo iwlwifi | grep -e 8265 -e version firmware: iwlwifi-8265-28.ucode vermagic: 4.11.8-1-zen SMP preempt mod_unload modversions When I journalctl -fk, I see the following error message repeat at a ~2s frequency. Jul 19 23:03:58 cratos kernel: ieee80211 phy0: Hardware restart was requested Jul 19 23:03:59 cratos kernel: iwlwifi 0000:3a:00.0: L1 Enabled - LTR Enabled Jul 19 23:03:59 cratos kernel: iwlwifi 0000:3a:00.0: L1 Enabled - LTR Enabled Jul 19 23:03:59 cratos kernel: iwlwifi 0000:3a:00.0: L1 Enabled - LTR Enabled Jul 19 23:03:59 cratos kernel: iwlwifi 0000:3a:00.0: L1 Enabled - LTR Enabled Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: Microcode SW error detected. Restarting 0x82000000. Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: CSR values: Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: (2nd byte of CSR_INT_COALESCING is CSR_INT_PERIODIC_REG) Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: CSR_HW_IF_CONFIG_REG: 0X00489000 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: CSR_INT_COALESCING: 0X00000040 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: CSR_INT: 0X00000000 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: CSR_INT_MASK: 0X00000000 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: CSR_FH_INT_STATUS: 0X00000000 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: CSR_GPIO_IN: 0X00000010 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: CSR_RESET: 0X00000000 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: CSR_GP_CNTRL: 0X08040005 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: CSR_HW_REV: 0X00000230 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: CSR_EEPROM_REG: 0Xd55555d5 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: CSR_EEPROM_GP: 0Xd55555d5 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: CSR_OTP_GP_REG: 0Xd55555d5 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: CSR_GIO_REG: 0X001f0042 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: CSR_GP_UCODE_REG: 0X00000000 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: CSR_GP_DRIVER_REG: 0X00000000 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: CSR_UCODE_DRV_GP1: 0X00000000 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: CSR_UCODE_DRV_GP2: 0X00000000 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: CSR_LED_REG: 0X00000060 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: CSR_DRAM_INT_TBL_REG: 0X88458227 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: CSR_GIO_CHICKEN_BITS: 0X07800200 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: CSR_ANA_PLL_CFG: 0Xd55555d5 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: CSR_MONITOR_STATUS_REG: 0Xc03803c0 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: CSR_HW_REV_WA_REG: 0X0001001a Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: CSR_DBG_HPET_MEM_REG: 0Xffff0000 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: FH register values: Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: FH_RSCSR_CHNL0_STTS_WPTR_REG: 0X45718c00 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: FH_RSCSR_CHNL0_RBDCB_BASE_REG: 0X045718b0 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: FH_RSCSR_CHNL0_WPTR: 0X00000060 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: FH_MEM_RCSR_CHNL0_CONFIG_REG: 0X80801054 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: FH_MEM_RSSR_SHARED_CTRL_REG: 0X000000fc Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: FH_MEM_RSSR_RX_STATUS_REG: 0X07830000 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: FH_MEM_RSSR_RX_ENABLE_ERR_IRQ2DRV: 0X00000000 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: FH_TSSR_TX_STATUS_REG: 0X07ff0003 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: FH_TSSR_TX_ERROR_REG: 0X00000000 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: Start IWL Error Log Dump: Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: Status: 0x00000000, count: 6 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: Loaded firmware version: 27.455470.0 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x00001007 | ADVANCED_SYSASSERT Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x00800634 | trm_hw_status0 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x00000000 | trm_hw_status1 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x00024358 | branchlink2 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x00039176 | interruptlink1 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x00000000 | interruptlink2 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x00030400 | data1 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x0000040B | data2 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0xDEADBEEF | data3 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x0C0158BD | beacon time Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0xD374F5C4 | tsf low Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x00000001 | tsf hi Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x00000000 | time gp1 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x00B89AB8 | time gp2 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x00000001 | uCode revision type Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x0000001B | uCode version major Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x0006F32E | uCode version minor Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x00000230 | hw version Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x00489000 | board version Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x0AA1001C | hcmd Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0xA4022002 | isr0 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x01000000 | isr1 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x0800180A | isr2 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x004178C5 | isr3 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x00000000 | isr4 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x0064019C | last cmd Id Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x00000000 | wait_event Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x00000080 | l2p_control Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x00012030 | l2p_duration Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x0000003F | l2p_mhvalid Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x000000CE | l2p_addr_match Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x0000000F | lmpm_pmg_sel Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x04012314 | timestamp Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x00006070 | flow_handler Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: Start IWL Error Log Dump: Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: Status: 0x00000000, count: 7 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x00000070 | ADVANCED_SYSASSERT Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x00000000 | umac branchlink1 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0xC0085C58 | umac branchlink2 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0xC0083438 | umac interruptlink1 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0xC0083438 | umac interruptlink2 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x00000800 | umac data1 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0xC0083438 | umac data2 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0xDEADBEEF | umac data3 Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x0000001B | umac major Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x0006F32E | umac minor Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0xC088627C | frame pointer Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0xC088627C | stack pointer Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x0064019C | last host cmd Jul 19 23:04:11 cratos kernel: iwlwifi 0000:3a:00.0: 0x00000000 | isr status reg
*** This bug has been marked as a duplicate of bug 172431 ***