This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed- bionic' to 'verification-done-bionic'. If the problem still exists, change the tag 'verification-needed-bionic' to 'verification-failed- bionic'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: verification-needed-bionic -- 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/1796443 Title: HP EliteBook 745 G5 (Ryzen 2500U) fails to boot unless `mce=off` is set on command line Status in Linux: Fix Released Status in linux package in Ubuntu: Fix Released Status in linux source package in Bionic: Fix Committed Status in linux source package in Cosmic: Won't Fix Status in linux source package in Disco: Fix Committed Bug description: === SRU Justification === [Impact] System doesn't boot without "mce=off". [Fix] Quote from the commit log: "Clear the "Counter Present" bit in the Instruction Fetch bank's MCA_MISC0 register. This will prevent enabling MCA thresholding on this bank which will prevent the high interrupt rate due to this error." [Test] The affected user reported these commits fix the issue. [Regression Potential] Low. Upstream stable commits. I don't see any regression on my unaffected AMD systems. === Original Bug Report === My new Elitebook, with the latest bios 1.03.01, refuses to boot any kernel later than 4.10 unless mce=off is appended to the kernel command line. As in, there are no kernel messages at all after grub (yes, quiet and splash were removed from the command line). Perhaps it crashes before the efifb kicks in? System operates fine if mce=off is added to the kernel command line (and iommu=soft, but that's a separate issue, and fails with kernel output in that case). I opened upstream bug here : https://bugzilla.kernel.org/show_bug.cgi?id=201291 I bisected the problem down to this commit (and the few before it, which also added extra MCE output, but didn't actually crash): 18807ddb7f88d4ac3797302bafb18143d573e66f is the first bad commit commit 18807ddb7f88d4ac3797302bafb18143d573e66f Author: Yazen Ghannam <yazen.ghan...@amd.com> Date: Tue Nov 15 15:13:53 2016 -0600 x86/mce/AMD: Reset Threshold Limit after logging error The error count field in MCA_MISC does not get reset by hardware when the threshold has been reached. Software is expected to reset it. Currently, the threshold limit only gets reset during init or when a user writes to sysfs. If the user is not monitoring threshold interrupts and resetting the limit then the user will only see 1 interrupt when the limit is first hit. So if, for example, the limit is set to 10 then only 1 interrupt will be recorded after 10 errors even if 100 errors have occurred. The user may then assume that only 10 errors have occurred. There are threads online about this being related to the latest bios. The upstream bug has acpidump attached. ProblemType: Bug DistroRelease: Ubuntu 18.10 Package: linux-image-4.18.0-8-generic 4.18.0-8.9 ProcVersionSignature: Ubuntu 4.18.0-8.9-generic 4.18.7 Uname: Linux 4.18.0-8-generic x86_64 ApportVersion: 2.20.10-0ubuntu11 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: john 2015 F.... pulseaudio /dev/snd/pcmC1D0p: john 2015 F...m pulseaudio /dev/snd/controlC0: john 2015 F.... pulseaudio CurrentDesktop: ubuntu:GNOME Date: Fri Oct 5 23:24:45 2018 InstallationDate: Installed on 2018-09-30 (5 days ago) InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Beta amd64 (20180927) Lsusb: Bus 005 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: HP HP EliteBook 745 G5 ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-8-generic root=UUID=5cf73665-d2a3-4203-80fd-659faf1afea4 ro quiet splash iommu=soft mce=off RelatedPackageVersions: linux-restricted-modules-4.18.0-8-generic N/A linux-backports-modules-4.18.0-8-generic N/A linux-firmware 1.175 RfKill: 1: phy0: Wireless LAN Soft blocked: no Hard blocked: no SourcePackage: linux StagingDrivers: r8822be UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 07/26/2018 dmi.bios.vendor: HP dmi.bios.version: Q81 Ver. 01.03.01 dmi.board.name: 83D5 dmi.board.vendor: HP dmi.board.version: KBC Version 08.47.00 dmi.chassis.asset.tag: 5CG838305Y dmi.chassis.type: 10 dmi.chassis.vendor: HP dmi.modalias: dmi:bvnHP:bvrQ81Ver.01.03.01:bd07/26/2018:svnHP:pnHPEliteBook745G5:pvr:rvnHP:rn83D5:rvrKBCVersion08.47.00:cvnHP:ct10:cvr: dmi.product.family: 103C_5336AN HP EliteBook dmi.product.name: HP EliteBook 745 G5 dmi.product.sku: 2MG23AV dmi.sys.vendor: HP To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1796443/+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
