@Kai-Heng Feng: Sorry, it took me a while to figure out how to do this. I have downgraded the linux-firmware package to 1.173 which is the only version I could find before 1.173.5. The problem started with the update to linux-firmware_1.173.5 and the regular update to 1.173.6 (which was the one running before the downgrade) did not resolve the issue.
@lotuspshychje: I have not yet downgraded the kernel to a previous version. (Current version: 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 package linux- generic 4.15.0.50.52). With the current kernel and the downgraded linux-firmware package the symptoms seem to have disappeared. This suggests that the issue is related to the linux-firmware package (starting at 1.173.5)rather than the kernel itself. (I expect the bug should be reclassified as applying to this package accordingly.) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1830350 Title: System freezes repeatedly for several seconds; wifi driver related errors Status in linux package in Ubuntu: Confirmed 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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