Wifi randomly dies; iwlwifi Microcode SW error detected

English Network/Internet
1

Hello,

I’m using a Lenovo Ideapad 320 laptop, and have a problem with Opensuse Tumbleweed (fully updated) where the Wifi randomly stops working. journalctl shows the following:

Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: Microcode SW error detected.  Restarting 0x2000000.
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: Start IWL Error Log Dump:
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: Status: 0x00000080, count: 6
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: Loaded firmware version: 29.1044073957.0
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00000EDC | ADVANCED_SYSASSERT          
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00000220 | trm_hw_status0
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00000000 | trm_hw_status1
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00043D54 | branchlink2
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x0004AFDA | interruptlink1
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00000000 | interruptlink2
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x0AE7001C | data1
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x20000067 | data2
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x0000180C | data3
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x9140AE9C | beacon time
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0xE023D168 | tsf low
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x0000011F | tsf hi
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00000000 | time gp1
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x1D2FEEF1 | time gp2
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00000001 | uCode revision type
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x0000001D | uCode version major
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x3E3B4DE5 | uCode version minor
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00000210 | hw version
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00C89200 | board version
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x20000067 | hcmd
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x24022002 | isr0
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00800000 | isr1
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00000002 | isr2
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x0041FCC1 | isr3
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00000000 | isr4
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x0AE5001C | last cmd Id
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00000000 | wait_event
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00000094 | l2p_control
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00018030 | l2p_duration
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x0000000F | l2p_mhvalid
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00000085 | l2p_addr_match
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00000005 | lmpm_pmg_sel
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x14031202 | timestamp
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00007888 | flow_handler
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: Fseq Registers:
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00000000 | FSEQ_ERROR_CODE
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00000000 | FSEQ_TOP_INIT_VERSION
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00000000 | FSEQ_CNVIO_INIT_VERSION
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00000000 | FSEQ_OTP_VERSION
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00000000 | FSEQ_TOP_CONTENT_VERSION
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00000000 | FSEQ_ALIVE_TOKEN
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00000000 | FSEQ_CNVI_ID
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00000000 | FSEQ_CNVR_ID
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00000000 | CNVI_AUX_MISC_CHIP
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00000000 | CNVR_AUX_MISC_CHIP
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00000000 | CNVR_SCU_SD_REGS_SD_REG_DIG_DCDC_VTRIM
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: 0x00000000 | CNVR_SCU_SD_REGS_SD_REG_ACTIVE_VDIG_MIRROR
Aug 14 20:04:23 ideapad kernel: iwlwifi 0000:03:00.0: Collecting data: trigger 2 fired.
Aug 14 20:04:23 ideapad kernel: ieee80211 phy0: Hardware restart was requested

Info about iwlwifi:

Aug 14 19:56:11 ideapad kernel: iwlwifi 0000:03:00.0: loaded firmware version 29.1044073957.0 op_mode iwlmvm
Aug 14 19:56:11 ideapad kernel: iwlwifi 0000:03:00.0: Detected Intel(R) Dual Band Wireless AC 3165, REV=0x210
Aug 14 19:56:11 ideapad kernel: iwlwifi 0000:03:00.0: base HW address: f8:63:3f:9e:45:b2
Aug 14 19:56:11 ideapad kernel: iwlwifi 0000:03:00.0 wlp3s0: renamed from wlan0
Aug 14 19:56:12 ideapad NetworkManager[1111]: <info>  [1565805372.8451] rfkill2: found Wi-Fi radio killswitch (at /sys/devices/pci0000:00/0000:00:14.1/0000:03:00.0/ieee80211/phy0/rfkill2) (driver iwlwifi)

I can get it working again by restarting NetworkManager, but I would like it to get working properly. I see many people have had this problem, and Ubuntu reportedly fixed it in their kernel.

I have tried the following things:

Disabling power saving for Wifi in TLP

Adding “options cfg80211 cfg80211_disable_40mhz_24ghz=Y” in /etc/modprobe.d/cfg80211.conf

Adding “wifi.scan-rand-mac-address=no” in /etc/NetworkManager/NetworkManager.conf

I didn’t have this problem with Linux Mint 19.1, where I was using kernel 4.19, so perhaps it’s an issue introduced in kernel 5.x.

2

I had a similar issue that the wireless connection died sometimes when heavy load occured via wifi (OS: Tumbleweed). Closing and reconnecting to the wifi connection via NetworkManager (Plasma 5) did the job until the next issue.
With Leap and Fedore the wifi was stable. After searching the web several parameters for iwlwifi where suggested and the following works for me: iwlwifi swcrypto=1
I put it in /etc/modprobe.d/99-local.conf:

#
# please add local extensions to this file
#
options iwlwifi swcrypto=1
3

Sorry for the delay, for some reason I hadn’t been alerted of a reply.

Yes, I solved it in that way too, by creating /etc/modprobe.d/iwlwifi.conf where I put

options iwlwifi swcrypto=0 bt_coex_active=0 power_save=0
4

Nope, it still does it, both with swcrypto=1 and with 0.
Giving up, trying another distro for now…

5

I better mention (sorry if bumping) that after my last post I found out the issue was fixed in kernel 5.3, and sure enough after updating to that I haven’t had any problems since.
So now Tumbleweed is pretty much working perfectly. Hoping to stay on it for a long time now.