OK. I followed the above instructions and eventually managed to install
the recommended firmware and kernel. Upon rebooting there were several
console errors:

[    1.096562] Couldn't get size: 0x800000000000000e
[    1.700597] psmouse serio1: elantech: elantech_send_cmd query 0x02 failed.
[    1.700620] psmouse serio1: elantech: failed to query capabilities.

Eventually the system booted. The USB mouse didn't work but the laptop's
touch pad still functioned. Wireless network support appeared to be
fine. I did not experience the problems that triggered this bug report.

Output of "modinfo ath10k_core" before the upgrade:

filename:       
/lib/modules/4.15.0-50-generic/kernel/drivers/net/wireless/ath/ath10k/ath10k_core.ko
license:        Dual BSD/GPL
description:    Core module for Qualcomm Atheros 802.11ac wireless LAN cards.
author:         Qualcomm Atheros
srcversion:     165FDC1E16C9659545F5EBF
depends:        mac80211,cfg80211,ath
retpoline:      Y
intree:         Y
name:           ath10k_core
vermagic:       4.15.0-50-generic SMP mod_unload
signat:         PKCS#7
signer:
sig_key:
sig_hashalgo:   md4
parm:           debug_mask:Debugging mask (uint)
parm:           uart_print:Uart target debugging (bool)
parm:           skip_otp:Skip otp failure for calibration in testmode (bool)
parm:           cryptmode:Crypto mode: 0-hardware, 1-software (uint)
parm:           rawmode:Use raw 802.11 frame datapath (bool)


Output of 'modinfo ath10k_core" after the upgrade:

filename:       
/lib/modules/5.2.0-050200rc2-generic/kernel/drivers/net/wireless/ath/ath10k/ath10k_core.ko
license:        Dual BSD/GPL
description:    Core module for Qualcomm Atheros 802.11ac wireless LAN cards.
author:         Qualcomm Atheros
srcversion:     8629BA1FF61C3F4A154EFE0
depends:        mac80211,cfg80211,ath
retpoline:      Y
intree:         Y
name:           ath10k_core
vermagic:       5.2.0-050200rc2-generic SMP mod_unload
signat:         PKCS#7
signer:
sig_key:
sig_hashalgo:   md4
parm:           debug_mask:Debugging mask (uint)
parm:           uart_print:Uart target debugging (bool)
parm:           skip_otp:Skip otp failure for calibration in testmode (bool)
parm:           cryptmode:Crypto mode: 0-hardware, 1-software (uint)
parm:           rawmode:Use raw 802.11 frame datapath (bool)
parm:           coredump_mask:Bitfield of what to include in firmware crash 
file (ulong)


Output of 'modinfo ath10k_pci" before:

filename:       
/lib/modules/4.15.0-50-generic/kernel/drivers/net/wireless/ath/ath10k/ath10k_pci.ko
firmware:       ath10k/QCA9377/hw1.0/board.bin
firmware:       ath10k/QCA9377/hw1.0/firmware-5.bin
firmware:       ath10k/QCA6174/hw3.0/board-2.bin
firmware:       ath10k/QCA6174/hw3.0/board.bin
firmware:       ath10k/QCA6174/hw3.0/firmware-6.bin
firmware:       ath10k/QCA6174/hw3.0/firmware-5.bin
firmware:       ath10k/QCA6174/hw3.0/firmware-4.bin
firmware:       ath10k/QCA6174/hw2.1/board-2.bin
firmware:       ath10k/QCA6174/hw2.1/board.bin
firmware:       ath10k/QCA6174/hw2.1/firmware-5.bin
firmware:       ath10k/QCA6174/hw2.1/firmware-4.bin
firmware:       ath10k/QCA9887/hw1.0/board-2.bin
firmware:       ath10k/QCA9887/hw1.0/board.bin
firmware:       ath10k/QCA9887/hw1.0/firmware-5.bin
firmware:       ath10k/QCA988X/hw2.0/board-2.bin
firmware:       ath10k/QCA988X/hw2.0/board.bin
firmware:       ath10k/QCA988X/hw2.0/firmware-5.bin
firmware:       ath10k/QCA988X/hw2.0/firmware-4.bin
firmware:       ath10k/QCA988X/hw2.0/firmware-3.bin
firmware:       ath10k/QCA988X/hw2.0/firmware-2.bin
license:        Dual BSD/GPL
description:    Driver support for Qualcomm Atheros 802.11ac WLAN PCIe/AHB 
devices
author:         Qualcomm Atheros
srcversion:     63EC35DB9BF9FC4074A002D
alias:          pci:v0000168Cd00000050sv*sd*bc*sc*i*
alias:          pci:v0000168Cd00000042sv*sd*bc*sc*i*
alias:          pci:v0000168Cd00000046sv*sd*bc*sc*i*
alias:          pci:v0000168Cd00000056sv*sd*bc*sc*i*
alias:          pci:v0000168Cd00000040sv*sd*bc*sc*i*
alias:          pci:v0000168Cd0000003Esv*sd*bc*sc*i*
alias:          pci:v0000168Cd00000041sv*sd*bc*sc*i*
alias:          pci:v0000168Cd0000003Csv*sd*bc*sc*i*
depends:        ath10k_core
retpoline:      Y
intree:         Y
name:           ath10k_pci
vermagic:       4.15.0-50-generic SMP mod_unload
signat:         PKCS#7
signer:

Output of "modinfo ath10k_pci" after:

filename:       
/lib/modules/5.2.0-050200rc2-generic/kernel/drivers/net/wireless/ath/ath10k/ath10k_pci.ko
firmware:       ath10k/QCA9377/hw1.0/board.bin
firmware:       ath10k/QCA9377/hw1.0/firmware-5.bin
firmware:       ath10k/QCA9377/hw1.0/firmware-6.bin
firmware:       ath10k/QCA6174/hw3.0/board-2.bin
firmware:       ath10k/QCA6174/hw3.0/board.bin
firmware:       ath10k/QCA6174/hw3.0/firmware-6.bin
firmware:       ath10k/QCA6174/hw3.0/firmware-5.bin
firmware:       ath10k/QCA6174/hw3.0/firmware-4.bin
firmware:       ath10k/QCA6174/hw2.1/board-2.bin
firmware:       ath10k/QCA6174/hw2.1/board.bin
firmware:       ath10k/QCA6174/hw2.1/firmware-5.bin
firmware:       ath10k/QCA6174/hw2.1/firmware-4.bin
firmware:       ath10k/QCA9887/hw1.0/board-2.bin
firmware:       ath10k/QCA9887/hw1.0/board.bin
firmware:       ath10k/QCA9887/hw1.0/firmware-5.bin
firmware:       ath10k/QCA988X/hw2.0/board-2.bin
firmware:       ath10k/QCA988X/hw2.0/board.bin
firmware:       ath10k/QCA988X/hw2.0/firmware-5.bin
firmware:       ath10k/QCA988X/hw2.0/firmware-4.bin
firmware:       ath10k/QCA988X/hw2.0/firmware-3.bin
firmware:       ath10k/QCA988X/hw2.0/firmware-2.bin
license:        Dual BSD/GPL
description:    Driver support for Qualcomm Atheros 802.11ac WLAN PCIe/AHB 
devices
author:         Qualcomm Atheros
srcversion:     5CC3E1846D3C5D0B99778E8
alias:          pci:v0000168Cd00000050sv*sd*bc*sc*i*
alias:          pci:v0000168Cd00000042sv*sd*bc*sc*i*
alias:          pci:v0000168Cd00000046sv*sd*bc*sc*i*
alias:          pci:v0000168Cd00000056sv*sd*bc*sc*i*
alias:          pci:v0000168Cd00000040sv*sd*bc*sc*i*
alias:          pci:v0000168Cd0000003Esv*sd*bc*sc*i*
alias:          pci:v0000168Cd00000041sv*sd*bc*sc*i*
alias:          pci:v0000168Cd0000003Csv*sd*bc*sc*i*
alias:          pci:v00000777d000011ACsv*sd*bc*sc*i*
depends:        ath10k_core
retpoline:      Y
intree:         Y
name:           ath10k_pci
vermagic:       5.2.0-050200rc2-generic SMP mod_unload
signat:         PKCS#7
signer:
sig_key:
sig_hashalgo:   md4
parm:           irq_mode:0: auto, 1: legacy, 2: msi (default: 0) (uint)
parm:           reset_mode:0: auto, 1: warm only (default: 0) (uint)

Output of 'uname -a' before:

inux dellfvw 4.15.0-50-generic #54-Ubuntu SMP Mon May 6 18:46:08 UTC
2019 x86_64 x86_64 x86_64 GNU/Linux

and after:

Linux dellfvw 5.2.0-050200rc2-generic #201905262130 SMP Mon May 27
01:33:02 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

Output of 'dmesg' and the relevant portion of /var/log/syslog attached.

I then reverted to my previous configuration to resolve errors at boot
time and restore USB mouse support. (As I mentioned this is my main
production machine and I need it to make a living with so it has to work
properly.)

Current output of 'uname -a':
Linux dellfvw 4.15.0-50-generic #54-Ubuntu SMP Mon May 6 18:46:08 UTC 2019 
x86_64 x86_64 x86_64 GNU/Linux 

Current output of "dpkg -l | grep linux-firmware"
ii  linux-firmware                                1.173                         
               all          Firmware for Linux kernel drivers

So I am now back to running the same versions as before I attempted the
latest kernel and firmware drivers.

HOWEVER... The issue is now back, with the 1.1.7.3 firmware!!

>From the syslog:

Jun  5 17:20:59 dellfvw kernel: [  849.573785] pcieport 0000:00:1c.5: AER: 
Corrected error received: id=00e5
Jun  5 17:20:59 dellfvw kernel: [  849.573794] pcieport 0000:00:1c.5: PCIe Bus 
Error: severity=Corrected, type=Data Link Layer, id=00e5(Transmitter ID)
Jun  5 17:20:59 dellfvw kernel: [  849.573802] pcieport 0000:00:1c.5:   device 
[8086:9d15] error status/mask=00001000/00002000
Jun  5 17:20:59 dellfvw kernel: [  849.573807] pcieport 0000:00:1c.5:    [12] 
Replay Timer Timeout
Jun  5 17:22:09 dellfvw kernel: [  919.092051] pcieport 0000:00:1c.5: AER: 
Corrected error received: id=00e5
Jun  5 17:22:09 dellfvw kernel: [  919.092068] pcieport 0000:00:1c.5: PCIe Bus 
Error: severity=Corrected, type=Data Link Layer, id=00e5(Transmitter ID)
Jun  5 17:22:09 dellfvw kernel: [  919.092082] pcieport 0000:00:1c.5:   device 
[8086:9d15] error status/mask=00001000/00002000
Jun  5 17:22:09 dellfvw kernel: [  919.092093] pcieport 0000:00:1c.5:    [12] 
Replay Timer Timeout
Jun  5 17:22:09 dellfvw systemd[1]: Starting Cleanup of Temporary Directories...
Jun  5 17:22:09 dellfvw systemd[1]: Started Cleanup of Temporary Directories.
Jun  5 17:22:32 dellfvw wpa_supplicant[1083]: wlp3s0: CTRL-EVENT-SCAN-FAILED 
ret=-110
Jun  5 17:22:32 dellfvw kernel: [  942.728371] ath10k_pci 0000:03:00.0: failed 
to receive scan abortion completion: timed out
Jun  5 17:22:32 dellfvw kernel: [  942.728374] ath10k_pci 0000:03:00.0: failed 
to stop scan: -110
Jun  5 17:22:32 dellfvw kernel: [  942.728376] ath10k_pci 0000:03:00.0: failed 
to start hw scan: -110
Jun  5 17:25:43 dellfvw kernel: [ 1133.299821] pcieport 0000:00:1c.5: AER: 
Corrected error received: id=00e5
Jun  5 17:25:43 dellfvw kernel: [ 1133.299835] pcieport 0000:00:1c.5: PCIe Bus 
Error: severity=Corrected, type=Data Link Layer, id=00e5(Transmitter ID)
Jun  5 17:25:43 dellfvw kernel: [ 1133.299846] pcieport 0000:00:1c.5:   device 
[8086:9d15] error status/mask=00001000/00002000
Jun  5 17:25:43 dellfvw kernel: [ 1133.299854] pcieport 0000:00:1c.5:    [12] 
Replay Timer Timeout
Jun  5 17:27:19 dellfvw kernel: [ 1229.057676] pcieport 0000:00:1c.5: AER: 
Corrected error received: id=00e5
Jun  5 17:27:19 dellfvw kernel: [ 1229.057693] pcieport 0000:00:1c.5: PCIe Bus 
Error: severity=Corrected, type=Data Link Layer, id=00e5(Transmitter ID)
Jun  5 17:27:19 dellfvw kernel: [ 1229.057708] pcieport 0000:00:1c.5:   device 
[8086:9d15] error status/mask=00001000/00002000
Jun  5 17:27:19 dellfvw kernel: [ 1229.057717] pcieport 0000:00:1c.5:    [12] 
Replay Timer Timeout
Jun  5 17:27:32 dellfvw wpa_supplicant[1083]: wlp3s0: CTRL-EVENT-SCAN-FAILED 
ret=-110
Jun  5 17:27:32 dellfvw kernel: [ 1242.756171] ath10k_pci 0000:03:00.0: failed 
to receive scan abortion completion: timed out
Jun  5 17:27:32 dellfvw kernel: [ 1242.756180] ath10k_pci 0000:03:00.0: failed 
to stop scan: -110
Jun  5 17:27:32 dellfvw kernel: [ 1242.756184] ath10k_pci 0000:03:00.0: failed 
to start hw scan: -110
Jun  5 17:32:32 dellfvw kernel: [ 1542.765615] ath10k_pci 0000:03:00.0: failed 
to receive scan abortion completion: timed out
Jun  5 17:32:32 dellfvw kernel: [ 1542.765623] ath10k_pci 0000:03:00.0: failed 
to stop scan: -110
Jun  5 17:32:32 dellfvw kernel: [ 1542.765627] ath10k_pci 0000:03:00.0: failed 
to start hw scan: -110
Jun  5 17:32:32 dellfvw wpa_supplicant[1083]: wlp3s0: CTRL-EVENT-SCAN-FAILED 
ret=-110

So while the 5.2.0 kernel with the latest firmware drivers seemed to
have resolved the issue (but introduces a lot of problems related to a
manual install of same) I now have the problem with the same versions
that previously worked OK.

I'm not sure where to go from here. I came close to wrecking the PC with
which I make a living and I'm not comfortable with the risk of hosing it
in an attempt to try out different development builds. Reverting to the
previous configuration took quite a bit of effort and I'm now worse off
then before this experiment.

Suggestions on how to proceed are welcome!!

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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1830350

Title:
  System freezes repeatedly for several seconds; wifi driver related
  errors

Status in linux package in Ubuntu:
  Confirmed
Status in linux-firmware package in Ubuntu:
  New

Bug description:
  I updated my system about a month ago (Fri 26 April 2019). This was
  the first update in several weeks and installed fresh versions of a
  whole truck load of applications including a kernel update. Since this
  latest bunch of updates the system freezes for a few seconds at
  regular intervals. Not fatal, but very annoying.

  Output from "journalctl -f" shows the following errors occurring at
  the same time as these freezes:

  May 24 10:31:18 dellfvw wpa_supplicant[1078]: wlp3s0: CTRL-EVENT-SCAN-FAILED 
ret=-110
  May 24 10:31:18 dellfvw kernel: ath10k_pci 0000:03:00.0: failed to receive 
scan abortion completion: timed out
  May 24 10:31:18 dellfvw kernel: ath10k_pci 0000:03:00.0: failed to stop scan: 
-110
  May 24 10:31:18 dellfvw kernel: ath10k_pci 0000:03:00.0: failed to start hw 
scan: -110

  Corresponding lines in /var/log/syslog:

  May 24 10:29:16 dellfvw avahi-daemon[1053]: Registering new address record 
for fe80::424:c75b:2a2d:52e2 on wlp3s0.*.
  May 24 10:29:55 dellfvw avahi-daemon[1053]: Withdrawing address record for 
fe80::424:c75b:2a2d:52e2 on wlp3s0.
  May 24 10:31:18 dellfvw wpa_supplicant[1078]: wlp3s0: CTRL-EVENT-SCAN-FAILED 
ret=-110
  May 24 10:31:18 dellfvw kernel: [45569.661175] ath10k_pci 0000:03:00.0: 
failed to receive scan abortion completion: timed out
  May 24 10:31:18 dellfvw kernel: [45569.661183] ath10k_pci 0000:03:00.0: 
failed to stop scan: -110
  May 24 10:31:18 dellfvw kernel: [45569.661187] ath10k_pci 0000:03:00.0: 
failed to start hw scan: -110

  I do note the interval between the avahi-daemon entry and the
  subsequent errors related to the wireless network interface, but the
  former precede the latter consistently in syslog, suggesting they may
  be related, which is why I'm including it in this report.

  The freezes last a few seconds. Keyboard input is preserved at this
  time and typed input appears after the freeze is resolved. Mouse
  cursor continues to move during freezes but mouse clicks are only
  processed after the freeze is resolved, i.e. the result of the mouse
  click is suspended (e.g. buffered) until the system becomes responsive
  again. For example, clicking on a window during the freeze will focus
  that window after the freeze has been resolved.

  The system is a Dell Inspiron 15 3576. Relevant output of lspci -nnk:

  03:00.0 Network controller [0280]: Qualcomm Atheros QCA9377 802.11ac
  Wireless Network Adapter [168c:0042] (rev 31)

  Output of lsb_release -rd:
  Description:  Ubuntu 18.04.2 LTS
  Release:      18.04

  Output of uname -a:
  Linux dellfvw 4.15.0-50-generic #54-Ubuntu SMP Mon May 6 18:46:08 UTC 2019 
x86_64 x86_64 x86_64 GNU/Linux

  As already said, this is a new issue that has began occurring only
  after the recent batch of updates that included a kernel update. I
  reported the bug (maybe in the wrong place) but so far I have received
  no response. I've lived with this for a month or so hoping that
  further updates would fix the problem but it still persists.
  Installing the latest firmware update (14 Mar 2019) has no effect. No
  other changes were made to either hardware or OS configuration.

  Logfile snippets attached.
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  frankvw    1989 F.... pulseaudio
  CurrentDesktop: GNOME
  DistroRelease: Ubuntu 18.04
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=7d4169aa-136e-4eac-bb87-bb1b63b0bb27
  InstallationDate: Installed on 2018-05-10 (379 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  MachineType: Dell Inc. Inspiron 3576
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-50-generic 
root=UUID=0ce4cd7e-e0fd-4fe0-83fc-9f845405ab62 ro quiet splash vt.handoff=1
  ProcVersionSignature: Ubuntu 4.15.0-50.54-generic 4.15.18
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-50-generic N/A
   linux-backports-modules-4.15.0-50-generic  N/A
   linux-firmware                             1.173.6
  Tags:  bionic
  Uname: Linux 4.15.0-50-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip disk lpadmin plugdev sambashare sudo users vboxusers
  _MarkForUpload: True
  dmi.bios.date: 01/16/2019
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.7.0
  dmi.board.name: 0K83NX
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.7.0:bd01/16/2019:svnDellInc.:pnInspiron3576:pvr:rvnDellInc.:rn0K83NX:rvrA00:cvnDellInc.:ct10:cvr:
  dmi.product.family: Inspiron
  dmi.product.name: Inspiron 3576
  dmi.sys.vendor: Dell Inc.

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