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Groups > linux.debian.kernel > #79419 > unrolled thread
| Started by | Soren Stoutner <soren@stoutner.com> |
|---|---|
| First post | 2023-06-24 22:10 +0200 |
| Last post | 2023-06-24 22:10 +0200 |
| Articles | 1 — 1 participant |
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Bug#1039029: linux-signed-amd64: Core frequencies do not float correctly on AMD Ryzen 7 5700U when running on battery Soren Stoutner <soren@stoutner.com> - 2023-06-24 22:10 +0200
| From | Soren Stoutner <soren@stoutner.com> |
|---|---|
| Date | 2023-06-24 22:10 +0200 |
| Subject | Bug#1039029: linux-signed-amd64: Core frequencies do not float correctly on AMD Ryzen 7 5700U when running on battery |
| Message-ID | <GKhK2-DjQ-9@gated-at.bofh.it> |
Source: linux-signed-amd64 Version: 6.3.7+1 Severity: normal On my laptop running an AMD Ryzen 7 5700U CPU, when on battery there are problems with the core frequency logic. When a process consumes 100% CPU usage on a single core, the system forces the core frequencey to the lowest value (399 MHz) instead of letting it float up to the highest frequency (4.3 GHz). At the same time, other cores that have minimal CPU utilization will increate frequency up to the maximum, meaning that the CPU isn't locked to the lower frequency as a whole, but that something about the frequency control logic isn't making the correct decisions. This causes the system to run very slowly when on battery. When the laptop is plugged in the behavior disappears, with cores that are consuming significant CPU able to increase the frequency to the maximum value. It is unclear to me if this problem is with the Linux kernel or some other component. Someone who is more knowledgeable about these things than I am might be able to point me in the right direction. -- System Information: Debian Release: trixie/sid APT prefers testing APT policy: (500, 'testing') Architecture: amd64 (x86_64) Kernel: Linux 6.3.0-1-amd64 (SMP w/16 CPU threads; PREEMPT) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set Shell: /bin/sh linked to /usr/bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled
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