Ubuntu(kernel 5.x) presents the fallowing error using dmesg -w:
[103916.261609] ath10k_pci 0000:02:00.0: firmware crashed! (guid bf84d993-9ec2-4eb5-82db-2055687625cc)
[103916.261619] ath10k_pci 0000:02:00.0: qca6174 hw3.2 target 0x05030000 chip_id 0x00340aff sub 1028:0310
[103916.261623] ath10k_pci 0000:02:00.0: kconfig debug 0 debugfs 1 tracing 1 dfs 0 testmode 0
[103916.262515] ath10k_pci 0000:02:00.0: firmware ver WLAN.RM.4.4.1-00079-QCARMSWPZ-1 api 6 features wowlan,ignore-otp crc32 fd869beb
[103916.263208] ath10k_pci 0000:02:00.0: board_file api 2 bmi_id N/A crc32 4ac0889b
[103916.263212] ath10k_pci 0000:02:00.0: htt-ver 3.47 wmi-op 4 htt-op 3 cal otp max-sta 32 raw 0 hwcrypto 1
[103916.275666] ath10k_pci 0000:02:00.0: failed to get memcpy hi address for firmware address 4: -16
[103916.275669] ath10k_pci 0000:02:00.0: failed to read firmware dump area: -16
[103916.275672] ath10k_pci 0000:02:00.0: Copy Engine register dump:
[103916.275691] ath10k_pci 0000:02:00.0: [00]: 0x00034400 11 11 3 3
[103916.275711] ath10k_pci 0000:02:00.0: [01]: 0x00034800 14 15 156 157
[103916.275724] ath10k_pci 0000:02:00.0: [02]: 0x00034c00 56 56 55 56
[103916.275738] ath10k_pci 0000:02:00.0: [03]: 0x00035000 12 12 14 12
[103916.275751] ath10k_pci 0000:02:00.0: [04]: 0x00035400 4619 3915 231 167
[103916.275765] ath10k_pci 0000:02:00.0: [05]: 0x00035800 0 0 64 0
[103916.275779] ath10k_pci 0000:02:00.0: [06]: 0x00035c00 15 16 7 8
[103916.275799] ath10k_pci 0000:02:00.0: [07]: 0x00036000 0 1 0 1
[103916.296131] ath10k_pci 0000:02:00.0: failed to read hi_board_data address: -28
[103916.663747] ath10k_pci 0000:02:00.0: unsupported HTC service id: 1536
[103916.779673] ath10k_pci 0000:02:00.0: device successfully recovered
[103928.445281] ath10k_pci 0000:02:00.0: unsupported HTC service id: 1536
The driver for QCA6174 802.11ac Wireless Network Adapter doesn't work very well on kernel 5.x. The solution was downgrade Ubuntu kernel to 4.15 that will receive security upgrades util 2023.
$ sudo apt-get linux-firmware linux-image-4.15.0-112-generic linux-headers-4.15.0-112-generic linux-modules-extra-4.15.0-112-generic
After downgrade the kernel is needed update the driver for Ath10k/QCA6174 [1].
$ cd /lib/firmware/ath10k/QCA6174/hw3.0
$ sudo mv firmware-6.bin firmware-6.bin.old
$ sudo wget https://github.com/kvalo/ath10k-firmware/raw/master/QCA6174/hw3.0/4.4.1/firmware-6.bin_WLAN.RM.4.4.1-00110-QCARMSWP-1 -O firmware-6.bin
After this steps is necessary reboot.