Public bug reported:
On Kubuntu 24.04 (Noble), the Logitech G733 wireless USB dongle is
disconnected by the kernel as soon as the headset is powered on when
running kernel 6.17.0-14-generic (HWE stack). After the disconnect, the
device cannot be recovered via software rescan; only physically
unplugging and replugging the dongle restores functionality.
This is a regression. The exact same hardware and system configuration
work reliably with kernel 6.14.0-37-generic. With 6.14, turning the
headset on or off does not cause any USB disconnects, and the device
remains stable across reboots.
On the affected kernel (6.17), powering on the headset immediately
triggers a kernel log entry similar to:
usb X-Y.Z: USB disconnect, device number N
After that event:
The USB device disappears completely.
KDE/Plasma reports that the corresponding ALSA/PipeWire device no longer
exists.
A USB rescan does not restore the device.
Only a physical unplug/replug resets the port and makes it work again.
System context:
Kubuntu 24.04 with linux-image-generic-hwe-24.04
power-profiles-daemon enabled and active
/sys/module/usbcore/parameters/autosuspend = 2 (default)
Ubuntu Pro enabled (esm-apps/esm-infra), livepatch not active for this
kernel
Given that the issue is strictly reproducible on 6.17 and does not occur
on 6.14, this appears to be a regression in the USB/xHCI or runtime
power management handling introduced between these kernel versions.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.14.0-37-generic 6.14.0-37.37~24.04.1
ProcVersionSignature: Ubuntu 6.14.0-37.37~24.04.1-generic 6.14.11
Uname: Linux 6.14.0-37-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
CRDA: N/A
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Mon Feb 9 18:19:48 2026
InstallationDate: Installed on 2026-02-03 (6 days ago)
InstallationMedia: Kubuntu 24.04.3 LTS "Noble Numbat" - Release amd64
(20250805.1)
IwConfig:
lo no wireless extensions.
enp5s0 no wireless extensions.
wg0-mullvad no wireless extensions.
MachineType: Gigabyte Technology Co., Ltd. X570 AORUS ELITE
ProcFB: 0 nvidia-drmdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.14.0-37-generic
root=UUID=f4529441-9dcc-4f6d-9773-151d699e8ab4 ro quiet splash vt.handoff=7
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-6.14.0-37-generic N/A
linux-backports-modules-6.14.0-37-generic N/A
linux-firmware 20240318.git3b128b60-0ubuntu2.23
RfKill:
SourcePackage: linux-hwe-6.14
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/28/2025
dmi.bios.release: 5.17
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: F40
dmi.board.asset.tag: Default string
dmi.board.name: X570 AORUS ELITE
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: Default string
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias:
dmi:bvnAmericanMegatrendsInternational,LLC.:bvrF40:bd10/28/2025:br5.17:svnGigabyteTechnologyCo.,Ltd.:pnX570AORUSELITE:pvr-CF:rvnGigabyteTechnologyCo.,Ltd.:rnX570AORUSELITE:rvrDefaultstring:cvnDefaultstring:ct3:cvrDefaultstring:skuDefaultstring:
dmi.product.family: X570 MB
dmi.product.name: X570 AORUS ELITE
dmi.product.sku: Default string
dmi.product.version: -CF
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
** Affects: linux-hwe-6.14 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble
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https://bugs.launchpad.net/bugs/2141339
Title:
Regression: Logitech G733 USB dongle disconnects when headset is
powered on (works on 6.14, broken on 6.17 HWE)
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