You have been subscribed to a public bug:
You will see these CPUs in offline state after boot.
ubuntu@baltar:~$ cat /sys/devices/system/cpu/offline
156-159
ubuntu@baltar:~$ echo 1 | sudo tee /sys/devices/system/cpu/cpu156/online
1
tee: /sys/devices/system/cpu/cpu156/online: Invalid argument
ubuntu@baltar:~$ echo 1 | sudo tee /sys/devices/system/cpu157/online
tee: /sys/devices/system/cpu157/online: No such file or directory
1
ubuntu@baltar:~$ echo 1 | sudo tee /sys/devices/system/cpu158/online
tee: /sys/devices/system/cpu158/online: No such file or directory
1
ubuntu@baltar:~$ echo 1 | sudo tee /sys/devices/system/cpu159/online
tee: /sys/devices/system/cpu159/online: No such file or directory
1
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-5.0.0-14-generic 5.0.0-14.15~18.04.1+signed1
ProcVersionSignature: Ubuntu 5.0.0-14.15~18.04.1-generic 5.0.6
Uname: Linux 5.0.0-14-generic ppc64le
ApportVersion: 2.20.9-0ubuntu7.6
Architecture: ppc64el
Date: Thu May 2 06:46:36 2019
ProcLoadAvg: 0.00 0.00 0.00 1/1298 6496
ProcSwaps:
Filename Type Size Used Priority
/swap.img file 8388544 0 -2
ProcVersion: Linux version 5.0.0-14-generic (buildd@bos02-ppc64el-014) (gcc
version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #15~18.04.1-Ubuntu SMP Thu Apr 25
18:55:27 UTC 2019
SourcePackage: linux-signed-hwe-edge
UpgradeStatus: No upgrade log present (probably fresh install)
VarLogDump_list: total 0
cpu_cores: Number of cores present = 40
cpu_coreson: Number of cores online = 39
cpu_dscr: DSCR is 16
cpu_freq:
min: 2.862 GHz (cpu 79)
max: 2.945 GHz (cpu 81)
avg: 2.903 GHz
cpu_runmode:
Could not retrieve current diagnostics mode,
No kernel interface to firmware
cpu_smt: SMT=4
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug bionic package-from-proposed ppc64el uec-images
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Unable to put offline CPU back online on B-hwe-edge P9
https://bugs.launchpad.net/bugs/1827335
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