The workaround from #42 seems to make the hard lockup less frequent for me, but it's not completely gone. I still experience a complete freeze from time to time. It's completely aleatory, and it doesn't seem related to the workload, although I suspect that it's related to powersaving. >From my experience, the probability of being hit by the freeze increases around a standby or resume event, or around plugging / unplugging the laptop.
When the hardlock occurs, the only thing I can do is to turn off the laptop by long-pressing the power button. I can't switch to a virtual tty, I can't reach the machine via SSH, REISUB doesn't work, etc. Upon restarting, there's absolutely nothing in the kernel logs that could be remotely related to the lockup. In fact, many times the last entry in `journalctl -b -1` is from several minutes *before* the lockup. I suspected of a hardware problem for a while, but the fact that every hardware test I've run finds nothing, coupled with the fact that the frequency of the freeze has *definitely* decreased with successive Ubuntu/kernel/mesa versions convinced me otherwise. My specs: - Lenovo ThinkPad T470s - Intel Core i5-7200U (Kaby Lake) - Intel HD Graphics 620 (rev 02) - Currenly on Ubuntu 18.10, kernel 4.18.0-17-generic, although for me this bug has been present ever since Ubuntu 17.10, kernel 4.13 -- 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/1798961 Title: Random unrecoverable freezes on Ubuntu 18.10 Status in Linux: New Status in linux package in Ubuntu: Triaged Status in linux source package in Bionic: Triaged Status in linux source package in Cosmic: Triaged Status in linux source package in Disco: Triaged Bug description: First thing I notice is that the mouse cursor freezes as I'm using it, then I hit the CAPS LOCK key and the LED indicator doesn't respond. Then I try the "REISUB" command, but it doesn't do anything either. Only a hard reset works, pressing down the power button for a few seconds. How to reproduce? I couldn't figure out a consistent method. It is still random to me. Version: Ubuntu 4.18.0-10.11-generic 4.18.12 System information attached. Also happens under Arch Linux and Fedora. I've talked to another user on IRC who seems to be having the same freezes. ProblemType: Bug DistroRelease: Ubuntu 18.10 Package: linux-image-4.18.0-10-generic 4.18.0-10.11 ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12 Uname: Linux 4.18.0-10-generic x86_64 ApportVersion: 2.20.10-0ubuntu13 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: dsilva 1213 F.... pulseaudio /dev/snd/controlC0: dsilva 1213 F.... pulseaudio CurrentDesktop: XFCE Date: Sat Oct 20 09:54:50 2018 InstallationDate: Installed on 2018-10-20 (0 days ago) InstallationMedia: Xubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.2) MachineType: Dell Inc. Inspiron 5458 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.18.0-10-generic root=/dev/mapper/xubuntu--vg-root ro quiet splash vt.handoff=1 RelatedPackageVersions: linux-restricted-modules-4.18.0-10-generic N/A linux-backports-modules-4.18.0-10-generic N/A linux-firmware 1.175 RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 02/02/2018 dmi.bios.vendor: Dell Inc. dmi.bios.version: A15 dmi.board.name: 09WGNT dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA15:bd02/02/2018:svnDellInc.:pnInspiron5458:pvr01:rvnDellInc.:rn09WGNT:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.name: Inspiron 5458 dmi.product.sku: Inspiron 5458 dmi.product.version: 01 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1798961/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
