Monitor idling not working (S1 sleep)

[FM33]

After delay set in preferences, screen will go blank, but monitor will stay on infinitely.

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.8.0-38-generic 6.8.0-38.38
ProcVersionSignature: Ubuntu 6.8.0-38.38-generic 6.8.8
Uname: Linux 6.8.0-38-generic x86_64
ApportVersion: 2.28.1-0ubuntu3
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/seq: fabien 2578 F.... pipewire
 /dev/snd/controlC0: fabien 2582 F.... wireplumber
CRDA: N/A
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Mon Jul 15 11:00:46 2024
InstallationDate: Installed on 2024-05-18 (58 days ago)
InstallationMedia: Ubuntu 24.04 LTS "Noble Numbat" - Release amd64 (20240424)
IwConfig:
 lo no wireless extensions.

 enp2s0 no wireless extensions.
MachineType: Micro-Star International Co., Ltd. MS-7E29
ProcEnviron:
 LANG=fr_FR.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 XDG_RUNTIME_DIR=<set>
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.8.0-38-generic root=UUID=16e9a6ad-4538-4a95-b7a6-4b036fe08aa1 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-6.8.0-38-generic N/A
 linux-backports-modules-6.8.0-38-generic N/A
 linux-firmware 20240318.git3b128b60-0ubuntu2.1
RfKill:

SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/25/2024
dmi.bios.release: 5.27
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: 1.50
dmi.board.asset.tag: Default string
dmi.board.name: PRO B760-P DDR4 II (MS-7E29)
dmi.board.vendor: Micro-Star International Co., Ltd.
dmi.board.version: 1.0
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Micro-Star International Co., Ltd.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInternational,LLC.:bvr1.50:bd03/25/2024:br5.27:svnMicro-StarInternationalCo.,Ltd.:pnMS-7E29:pvr1.0:rvnMicro-StarInternationalCo.,Ltd.:rnPROB760-PDDR4II(MS-7E29):rvr1.0:cvnMicro-StarInternationalCo.,Ltd.:ct3:cvr1.0:skuDefaultstring:
dmi.product.family: Default string
dmi.product.name: MS-7E29
dmi.product.sku: Default string
dmi.product.version: 1.0
dmi.sys.vendor: Micro-Star International Co., Ltd.