** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team)
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https://bugs.launchpad.net/bugs/2100778
Title:
Asus Prime B550 plus requires acpi=off which turns off SMP
Status in linux package in Ubuntu:
Confirmed
Bug description:
1) Ubuntu Release
No LSB modules are available.
Description: Ubuntu 24.04.2 LTS
Release: 24.04
2) Package version
6.8.0-54.56
3) What you expected to happen
I expected the system to be able to boot with ACPI.
4) What happened instead
The booting process got stuck halfway through (about when the console adjusts
it's resolution) if the kernel wasn't given the "acpi=off" parameter. However,
with this parameter, SMP doesn't work and my CPU is reduced to a single core
from 16 with HT.
I followed this guide for troubleshooting:
https://wiki.ubuntu.com/DebuggingACPI
The system refused to boot even with "acpi=ht".
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ProblemType: Bug
AlsaVersion: Advanced Linux Sound Architecture Driver Version
k6.8.0-54-generic.
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.28.1-0ubuntu3.3
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/timer',
'/dev/snd/seq', '/dev/snd/pcmC0D3p', '/dev/snd/pcmC0D7p', '/dev/snd/hwC0D0',
'/dev/snd/controlC0', '/dev/snd/by-path', '/dev/snd/pcmC1D0p',
'/dev/snd/pcmC1D0c', '/dev/snd/pcmC1D1p', '/dev/snd/pcmC1D2c',
'/dev/snd/hwC1D0', '/dev/snd/controlC1'] failed with exit code 1:
CRDA: N/A
Card0.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer'
Card0.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer'
Card1.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer'
Card1.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer'
CasperMD5CheckResult: pass
DistroRelease: Ubuntu 24.04
InstallationDate: Installed on 2025-02-27 (5 days ago)
InstallationMedia: Ubuntu-Server 24.04.1 LTS "Noble Numbat" - Release amd64
(20240827)
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
MachineType: ASUS System Product Name
Package: linux (not installed)
ProcFB: 0 simpledrmdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.8.0-54-generic
root=UUID=9259c67a-bfe3-40d8-ba70-ac06402f21b2 ro acpi=off
ProcVersionSignature: Ubuntu 6.8.0-54.56-generic 6.8.12
RelatedPackageVersions:
linux-restricted-modules-6.8.0-54-generic N/A
linux-backports-modules-6.8.0-54-generic N/A
linux-firmware 20240318.git3b128b60-0ubuntu2.9
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
Tags: noble
Uname: Linux 6.8.0-54-generic x86_64
UnreportableReason: This report is about a package that is not installed.
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: N/A
_MarkForUpload: False
acpidump:
dmi.bios.date: 09/29/2024
dmi.bios.release: 5.17
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 3611
dmi.board.asset.tag: Default string
dmi.board.name: PRIME B550-PLUS
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr3611:bd09/29/2024:br5.17:svnASUS:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnPRIMEB550-PLUS:rvrRevX.0x:cvnDefaultstring:ct3:cvrDefaultstring:skuSKU:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: System Product Name
dmi.product.sku: SKU
dmi.product.version: System Version
dmi.sys.vendor: ASUS
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