No wi-fi adapter found in Ubuntu 18.04 Intel Dual band wireless 8260.

[cristianoarbex]

I've had this PC for 3 years (Asus Zenbook). It is a dual boot, it used to be Windows 10 and Ubuntu 16.04, 3 months ago I upgraded to Ubuntu 18.04. Everything was working fine. Wifi in Windows 10 is working fine.

My laptop is an Asus Zenbook UX330UA, bios version 315. In Ubuntu I am getting the message "No wi-fi adapter found" in the settings. Secure boot was enabled (I had disabled it when I first installed dual boot, not sure why and when it was back to enabled). Even though in Asus Zenbook the option to disable secure boot is grayed out, I could disable it by disabling Fast Boot.

The problem began yesterday, (apparently) out of nowhere. I also tried rebooting with a USB live stick containing Ubuntu 20.04 - and wifi was not detected. But in Windows it always work.

Most of the times the network adapter is not found by Ubuntu. For instance, lshw shows no wireless card:

sudo lshw -C network: 

 *-network:0               
       description: Ethernet interface
       physical id: 1
       ...
  *-network:1
       description: Ethernet interface
       ...
  *-network:2
       description: Ethernet interface
       ...

Both

lspci -nnk | grep 0280 -A3

and

sudo modprobe iwlwifi && dmesg | grep iwl

return nothing. Also, rfkill shows only bluetooth:

sudo rfkill list all 
0: hci0: Bluetooth 
    Soft blocked: no 
    Hard blocked: no

The firmware seems to be there:

ls /lib/firmware | grep 8000

iwlwifi-8000C-13.ucode
iwlwifi-8000C-16.ucode
iwlwifi-8000C-21.ucode
iwlwifi-8000C-22.ucode
iwlwifi-8000C-27.ucode
iwlwifi-8000C-31.ucode
iwlwifi-8000C-34.ucode
iwlwifi-8000C-36.ucode

Very rarely, when I reboot my computer, Ubuntu finds the wireless card, but wifi still does not work. When this is the case, I get this:

sudo lshw -C network
  *-network                 
       description: Network controller
       product: Wireless 8260
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:02:00.0
       version: 3a
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list
       configuration: driver=iwlwifi latency=0
       resources: irq:127 memory:ef000000-ef001fff

lspci -nnk | grep 0280 -A3
02:00.0 Network controller [0280]: Intel Corporation Wireless 8260 [8086:24f3] (rev 3a)
    Subsystem: Intel Corporation Wireless 8260 [8086:0110]
    Kernel driver in use: iwlwifi
    Kernel modules: iwlwifi

sudo modprobe iwlwifi && dmesg | grep iwl
[    3.141197] iwlwifi 0000:02:00.0: enabling device (0000 -> 0002)
[    3.159278] iwlwifi 0000:02:00.0: iwlwifi transaction failed, dumping registers
[    3.159282] iwlwifi 0000:02:00.0: iwlwifi device config registers:
[    3.159326] iwlwifi 0000:02:00.0: 00000000: 24f38086 00100006 0280003a 00000000 00000004 00000000 00000000 00000000
[    3.159327] iwlwifi 0000:02:00.0: 00000020: 00000000 00000000 00000000 01108086 00000000 000000c8 00000000 00000100
[    3.159329] iwlwifi 0000:02:00.0: iwlwifi device memory mapped registers:
[    3.159362] iwlwifi 0000:02:00.0: 00000000: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
[    3.159364] iwlwifi 0000:02:00.0: 00000020: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff
[    3.159368] iwlwifi 0000:02:00.0: iwlwifi device AER capability structure:
[    3.159392] iwlwifi 0000:02:00.0: 00000000: 14010001 00100000 00000000 00462031 00002000 00000000 00000014 40000001
[    3.159393] iwlwifi 0000:02:00.0: 00000020: 0000000f ef00000c 00000000
[    3.159394] iwlwifi 0000:02:00.0: iwlwifi parent port (0000:00:1c.6) config registers:
[    3.159408] iwlwifi 0000:00:1c.6: 00000000: 9d168086 00100407 060400f1 00810010 00000000 00000000 00020200 200000f0
[    3.159409] iwlwifi 0000:00:1c.6: 00000020: ef00ef00 0001fff1 00000000 00000000 00000000 00000040 00000000 001003ff
[    3.159411] iwlwifi 0000:02:00.0: iwlwifi root port (0000:00:1c.6) AER cap structure:
[    3.159420] iwlwifi 0000:00:1c.6: 00000000: 14010001 00000000 00010000 00060011 00000000 00000000 0000000e 34000000
[    3.159422] iwlwifi 0000:00:1c.6: 00000020: 02001f10 00000000 00000000 00000007 00000000 000000e6
[    3.159461] WARNING: CPU: 3 PID: 347 at /build/linux-PK0ghA/linux-4.15.0/drivers/net/wireless/intel/iwlwifi/pcie/trans.c:1985 iwl_trans_pcie_grab_nic_access+0xea/0xf0 [iwlwifi]
[    3.159462] Modules linked in: iwlwifi(+) videobuf2_v4l2 videobuf2_core bluetooth i2c_algo_bit input_leds sr9700 fb_sys_fops serio_raw idma64 soundcore fjes(-) cfg80211 virt_dma videodev syscopyarea ecdh_generic sysfillrect joydev dm9601 media sysimgblt intel_lpss_pci(+) mei_me usbnet mii intel_lpss shpchp mei processor_thermal_device intel_pch_thermal intel_soc_dts_iosf wmi int3403_thermal int340x_thermal_zone acpi_als kfifo_buf video industrialio int3400_thermal acpi_thermal_rel asus_wireless mac_hid acpi_pad sch_fq_codel parport_pc ppdev lp parport ip_tables x_tables autofs4 hid_generic usbhid i2c_hid ahci libahci hid
[    3.159491] RIP: 0010:iwl_trans_pcie_grab_nic_access+0xea/0xf0 [iwlwifi]
[    3.159508]  iwl_trans_pcie_alloc+0x98b/0xcb0 [iwlwifi]
[    3.159516]  iwl_pci_probe+0x1d/0x1d0 [iwlwifi]
[    3.159540]  iwl_pci_register_driver+0x24/0x40 [iwlwifi]
[    3.159549]  iwl_drv_init+0x89/0x8b [iwlwifi]
[    3.195121] iwlwifi 0000:02:00.0: loaded firmware version 34.0.1 op_mode iwlmvm
[    3.269650] iwlwifi 0000:02:00.0: Detected Intel(R) Dual Band Wireless AC 8260, REV=0xFFFC
[    3.269665] iwlwifi 0000:02:00.0: Error, can not clear persistence bit

Thanks in advance for any possible help in dealing with this matter. I run the diagnostics script and the file wireless-info.tar.gz is attached.

[cristianoarbex]

There has been new developments in my problem. When I initially installed dual boot, I had initially disabled secure boot, but as mentioned before for some reason it was enabled again. In the Asus Zenbook BIOS, however, there was another option called Secure Boot Control, which was enabled. I don't know what it means, but I disabled it.

This changed the behaviour a bit. The erratic behaviour is gone, now everytime I restart the laptop in Ubuntu I see the following message:

  *-network UNCLAIMED       
       description: Network controller
       product: Wireless 8260
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:02:00.0
       version: 3a
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress cap_list
       configuration: latency=0
       resources: memory:ef000000-ef001fff

I the Update manager, I saw this:





The commands below show the following output:

lspci -nnk | grep 0280 -A3
02:00.0 Network controller [0280]: Intel Corporation Wireless 8260 [8086:24f3] (rev 3a)
    Subsystem: Intel Corporation Wireless 8260 [8086:0110]
    Kernel modules: iwlwifi

sudo modprobe iwlwifi && dmesg | grep iwl
[    3.626468] iwlwifi 0000:02:00.0: Refused to change power state, currently in D3
[    3.626772] iwlwifi 0000:02:00.0: HW_REV=0xFFFFFFFF, PCI issues?
[    3.651088] iwlwifi: probe of 0000:02:00.0 failed with error -5

I tried installing:

 
 sudo apt install backport-iwlwifi-dkms

After rebooting, nothing changed, only the image below:




Since then I purged the installation of backport-iwlwifi-dkms. Any help is greatly appreciated.

Edit: attached is the latest diagnostics file:
wireless-info.tar.gz