Qualcomm Atheros QCA9377 802.11ac Wireless Network Adapter [168c:0042] Subsystem [1028:1810] not detected on Ubuntu 20.04

[Prakash Advani]

I am using Ubuntu 20.04 on Dell 5575 with AMD Ryzen 5. WiFi was working during installation and after the I updated recent, it stopped working.

lspci | grep Atheros
03:00.0 Network controller: Qualcomm Atheros QCA9377 802.11ac Wireless Network Adapter (rev 31)

dmesg errors

[ 5.627332] ath10k_core_register_work+0x26/0x120 [ath10k_core]
[ 5.627355] ath10k_pci 0000:03:00.0: unable to get target info from device
[ 5.627358] ath10k_pci 0000:03:00.0: could not get target info (-5)
[ 5.627373] ath10k_pci 0000:03:00.0: could not probe fw (-5)

have tried using older kernel 5.4.0-26 but that didn't help.

I had to add this to grub, "nomodeset iommu=off" as it wasn't booting.

sudo lspci -vnvn > lspci-vnvn.log
pcilib: sysfs_read_vpd: read failed: Input/output error

lsb_release -rd
Description: Ubuntu 20.04 LTS
Release: 20.04
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27.3
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: poonam 1564 F.... pulseaudio
 /dev/snd/controlC0: poonam 1564 F.... pulseaudio
CasperMD5CheckResult: skip
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2020-07-13 (1 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
IwConfig:
 lo no wireless extensions.

 enp2s0 no wireless extensions.
MachineType: Dell Inc. Inspiron 5575
Package: linux (not installed)
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-40-generic root=UUID=72998a7f-f0f6-4782-b447-785cc101a1ac ro quiet splash nomodeset iommu=off vt.handoff=7
ProcVersionSignature: Ubuntu 5.4.0-40.44-generic 5.4.44
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-40-generic N/A
 linux-backports-modules-5.4.0-40-generic N/A
 linux-firmware 1.187.1
RfKill:
 0: hci0: Bluetooth
  Soft blocked: no
  Hard blocked: no
Tags: focal
Uname: Linux 5.4.0-40-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 10/31/2019
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.3.3
dmi.board.asset.tag: not specified
dmi.board.name: 0M0Y6P
dmi.board.vendor: Dell Inc.
dmi.board.version: X01
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: 1.3.3
dmi.modalias: dmi:bvnDellInc.:bvr1.3.3:bd10/31/2019:svnDellInc.:pnInspiron5575:pvr1.3.3:rvnDellInc.:rn0M0Y6P:rvrX01:cvnDellInc.:ct10:cvr1.3.3:
dmi.product.family: Inspiron
dmi.product.name: Inspiron 5575
dmi.product.sku: 0812
dmi.product.version: 1.3.3
dmi.sys.vendor: Dell Inc.

[Prakash Advani (padvani)]

cat version.log
Ubuntu 5.4.0-40.44-generic 5.4.44

dpkg -l | grep linux-firmware
ii linux-firmware 1.187.1 all Firmware for Linux kernel drivers

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1887623

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Prakash Advani (padvani)]

apport information

[Prakash Advani (padvani)]

apport information

[Prakash Advani (padvani)]

apport information

[Prakash Advani (padvani)]

apport information

[Prakash Advani (padvani)]

apport information

[Prakash Advani (padvani)]

apport information

[Prakash Advani (padvani)]

apport information

[Prakash Advani (padvani)]

apport information

[Prakash Advani (padvani)]

apport information

[Prakash Advani (padvani)]

apport information

[Prakash Advani (padvani)]

apport information

[Prakash Advani (padvani)]

apport information

[Prakash Advani (padvani)]

apport information

[Prakash Advani (padvani)]

apport information

[Prakash Advani (padvani)]

apport information

[Prakash Advani (padvani)]

apport information

[Kai-Heng Feng (kaihengfeng)]

Please remove "iommu=off" and see if it helps...

[Prakash Advani (padvani)]

Thanks, that solved the problem.

I removed "iommu=off"