Thanks for the reply, Aaron. The dmesg.log file is already attached above.
Your ffmpeg example is on the simple side compared to the pipeline that creates the issue for me, where ffmpeg has multiple inputs and a pipeline that touches both the GPU and the CPU. For simple things it works okay here as well. intel_gpu_top spikes to 100% on both Render/3D and Compute with very brief interruptions, probably while it moves the frame for processing by the CPU. Blitter, Video, and VideoEnhance remains at 0%. /proc/cpuinfo shows CPU comfortably alternating between 400MHz and 4GHz, apparently with plenty to spare and confirming the previous output provided by iostat and top in the original report above. sensors output shows the temperature for all CPUs comfortably under 70 degrees at all times, with almost all of them under 60. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-signed in Ubuntu. 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) Using a single thread in ffmpeg 4) Switching to the lowlatency kernel, with all recommended fiddling 5) Switching to the OEM kernel (6.8.0-1010-oem) 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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-signed/+bug/2076361/+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
