I'm running Ubuntu 20.04 and have noticed that after logging back on to a machine either after its been asleep/suspended or logged out due to inactivity the sound is much louder at the same volume. I haven't enabled amplification or any other sound feature.
To duplicate, boot machine with volume at say 50% and listen to some music. Let it either log out or suspend/sleep and then log back in, start music/sound and it will be much louder.
In fact this louder sound at the volume sounds correct, because the windows boot sounds the same at that level. When ubuntu boots the volume is much softer. The sound post logging in after a suspend or lock out is what it should be from the get go.
Soundcard details
00:1f.3 Audio device: Intel Corporation Cannon Lake PCH cAVS (rev 10)
DeviceName: Onboard - Sound
Subsystem: Hewlett-Packard Company Cannon Lake PCH cAVS
Flags: bus master, fast devsel, latency 32, IRQ 143
Memory at a3510000 (64-bit, non-prefetchable) [size=16K]
Memory at a3100000 (64-bit, non-prefetchable) [size=1M]
Capabilities: [50] Power Management version 3
Capabilities: [80] Vendor Specific Information: Len=14 <?>
Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+
Kernel driver in use: snd_hda_intel
Kernel modules: snd_hda_intel, snd_sof_pci
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27.2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: kashif 2925 F.... pulseaudio
/dev/snd/controlC0: kashif 2925 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2019-04-20 (414 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
NonfreeKernelModules: nvidia_modeset nvidia
Package: pulseaudio 1:13.99.1-1ubuntu3.2
PackageArchitecture: amd64
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 5.4.0-33.37-generic 5.4.34
Tags: focal
Uname: Linux 5.4.0-33-generic x86_64
UpgradeStatus: Upgraded to focal on 2020-05-08 (30 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 11/19/2019
dmi.bios.vendor: AMI
dmi.bios.version: F.25
dmi.board.name: 84FD
dmi.board.vendor: HP
dmi.board.version: 00
dmi.chassis.type: 3
dmi.chassis.vendor: HP
dmi.modalias: dmi:bvnAMI:bvrF.25:bd11/19/2019:svnHP:pnOMENbyHPObeliskDesktop875-0xxx:pvr:rvnHP:rn84FD:rvr00:cvnHP:ct3:cvr:
dmi.product.family: 103C_53311M HP Omen
dmi.product.name: OMEN by HP Obelisk Desktop 875-0xxx
dmi.product.sku: 4NM65AA#ABA
dmi.sys.vendor: HP
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