Public bug reported:
## Bug Description
After a system update applied on or around April 1st, 2026, the `performance`
platform profile now keeps both fans running at maximum RPM constantly
(~6500 RPM), regardless of actual system temperature.
## Expected behavior
Before the update, using the `performance` profile worked correctly: fans
would only spin up when the system actually needed cooling, and remained
quiet or at low speed during light usage (browsing, etc.).
## Current behavior
After the update, as soon as the system boots with the `performance` profile
active, both fans run at full speed (~6500 RPM) and never slow down, even
when all temperatures are completely normal.
Confirmed sensor readings during the issue (light load, only browser running):
- CPU Package: ~41°C
- CPU Cores: 33–41°C
- GPU: ~30°C
- HDD/SSD: ~28°C
- CPU Fan: 6493 RPM (reported max: 4600 RPM)
- Video Fan: 6451 RPM (reported max: 4700 RPM)
Switching to `balanced` profile immediately normalizes fan speed:
echo "balanced" | sudo tee /sys/firmware/acpi/platform_profile
The issue is 100% reproducible by switching back to `performance`:
echo "performance" | sudo tee /sys/firmware/acpi/platform_profile
## Kernel comparison
- 6.17.0-1012-oem → performance profile works correctly (fans respond to temp)
- 6.17.0-1017-oem → performance profile keeps fans at max RPM always (BUG)
## System info
- Machine: Alienware 16 Aurora AC16250
- CPU: Intel Core 7 240H
- GPU: NVIDIA (discrete) + Intel Arc (integrated)
- OS: Ubuntu 24.04 LTS (Noble Numbat)
- Kernel: 6.17.0-1017-oem
- Desktop: GNOME (Wayland)
## Workaround
Setting platform_profile to `balanced` at boot via /etc/tmpfiles.d resolves
the symptom, but the `performance` profile should not behave this way.
This is a regression introduced between 1012 and 1017.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.17.0-1017-oem 6.17.0-1017.17
ProcVersionSignature: Ubuntu 6.17.0-1017.17-oem 6.17.13
Uname: Linux 6.17.0-1017-oem x86_64
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: luiz-philip 3231 F.... wireplumber
/dev/snd/controlC1: luiz-philip 3231 F.... wireplumber
/dev/snd/seq: luiz-philip 3227 F.... pipewire
CRDA: N/A
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
CurrentDmesg: Error: command ['pkexec', 'dmesg'] failed with exit code 126:
Error executing command as another user: Request dismissed
Date: Thu Apr 2 16:19:39 2026
InstallationDate: Installed on 2026-03-10 (23 days ago)
InstallationMedia: Ubuntu 24.04.4 LTS "Noble Numbat" - Release amd64 (20260210)
MachineType: Alienware Alienware 16 Aurora AC16250
ProcEnviron:
LANG=pt_BR.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.17.0-1017-oem
root=UUID=995e267f-39c7-4e34-ade9-7dc74371f86c ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-6.17.0-1017-oem N/A
linux-backports-modules-6.17.0-1017-oem N/A
linux-firmware 20240318.git3b128b60-0ubuntu2.25
SourcePackage: linux-oem-6.17
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/24/2025
dmi.bios.release: 1.10
dmi.bios.vendor: Alienware
dmi.bios.version: 1.10.0
dmi.board.name: 02JYNF
dmi.board.vendor: Alienware
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Alienware
dmi.ec.firmware.release: 1.9
dmi.modalias:
dmi:bvnAlienware:bvr1.10.0:bd12/24/2025:br1.10:efr1.9:svnAlienware:pnAlienware16AuroraAC16250:pvr:rvnAlienware:rn02JYNF:rvrA00:cvnAlienware:ct10:cvr:sku0D35:
dmi.product.family: Alienware
dmi.product.name: Alienware 16 Aurora AC16250
dmi.product.sku: 0D35
dmi.sys.vendor: Alienware
** Affects: linux-oem-6.17 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble wayland-session
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https://bugs.launchpad.net/bugs/2147144
Title:
performance platform_profile keeps fans at max RPM on 6.17.0-1017-oem
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