** Also affects: linux-signed (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux-signed (Ubuntu)
Assignee: (unassigned) => Andy Whitcroft (apw)
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https://bugs.launchpad.net/bugs/2076361
Title:
Lenovo X12 Detachable Gen 2 unresponsive under light load
Status in linux-signed package in Ubuntu:
New
Status in linux-signed-lowlatency package in Ubuntu:
New
Bug description:
I've been using a Lenovo X12 Detachable Gen 2 model from 2024 [1] to
encode some video files with ffmpeg, and the system becomes completely
unresponsive for as long as the process executes. Although small, this
is a pretty good device hardware wise, and while executing the system
has plenty of RAM (32GB total, 10GB+ left), almost all CPUs are idle,
no IO wait.
[1] Intel Core Ultra 164U variant at:
https://psref.lenovo.com/syspool/Sys/PDF/Think_Tablets/ThinkPad_X12_Detachable_Gen_2/ThinkPad_X12_Detachable_Gen_2_Spec.pdf
Things I've tried:
1) Lowering the priority of ffmpeg with renice
2) Lowering the priority of ffmpeg with ionice
3) Switching to the lowlatency kernel, with all recommended fiddling
4) Using a single thread in ffmpeg
Nothing even touches the complete lack of responsiveness. The system
becomes so unresponsive that when typing nothing shows up, and then
characters show repeated as long sequences all at once.
In addition to the attached information, some details about the moment
the problem happens:
top - 16:27:49 up 3:26, 1 user, load average: 1.13, 0.70, 0.68
Tasks: 397 total, 1 running, 396 sleeping, 0 stopped, 0 zombie
%Cpu0 : 2.7 us, 0.0 sy, 0.0 ni, 56.3 id, 41.0 wa, 0.0 hi, 0.0 si, 0.0
st
%Cpu1 : 3.3 us, 0.3 sy, 0.0 ni, 96.4 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0
st
%Cpu2 : 3.0 us, 0.0 sy, 0.0 ni, 97.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0
st
%Cpu3 : 0.7 us, 1.0 sy, 6.3 ni, 2.7 id, 89.3 wa, 0.0 hi, 0.0 si, 0.0
st
%Cpu4 : 3.7 us, 0.0 sy, 0.0 ni, 96.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0
st
%Cpu5 : 4.0 us, 0.3 sy, 0.0 ni, 95.7 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0
st
%Cpu6 : 3.3 us, 0.0 sy, 0.0 ni, 96.3 id, 0.3 wa, 0.0 hi, 0.0 si, 0.0
st
%Cpu7 : 3.7 us, 0.0 sy, 0.0 ni, 96.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0
st
%Cpu8 : 4.3 us, 0.0 sy, 0.0 ni, 95.7 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0
st
%Cpu9 : 3.7 us, 0.0 sy, 0.0 ni, 96.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0
st
%Cpu10 : 4.0 us, 0.0 sy, 0.0 ni, 96.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0
st
%Cpu11 : 3.7 us, 0.0 sy, 0.0 ni, 96.3 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0
st
%Cpu12 : 3.0 us, 0.3 sy, 0.0 ni, 96.7 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0
st
%Cpu13 : 4.0 us, 0.0 sy, 0.0 ni, 96.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0
st
MiB Mem : 31537.6 total, 9596.6 free, 9784.3 used, 15292.1 buff/cache
MiB Swap: 8192.0 total, 8192.0 free, 0.0 used. 21753.3 avail Mem
Linux 6.8.0-39-lowlatency (x12) 08/08/2024 _x86_64_ (14 CPU)
avg-cpu: %user %nice %system %iowait %steal %idle
2.87 0.04 0.26 7.48 0.00 89.35
It may also be worth mentioning, the ffmpeg process is using hardware
encoding/decoding.
Thanks for any help on this.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.8.0-39-lowlatency 6.8.0-39.39.1
ProcVersionSignature: Ubuntu 6.8.0-39.39.1-lowlatency 6.8.8
Uname: Linux 6.8.0-39-lowlatency x86_64
ApportVersion: 2.28.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Thu Aug 8 17:23:32 2024
InstallationDate: Installed on 2024-06-25 (44 days ago)
InstallationMedia: Ubuntu 24.04 LTS "Noble Numbat" - Release amd64 (20240424)
SourcePackage: linux-signed-lowlatency
UpgradeStatus: No upgrade log present (probably fresh install)
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