I am running Linux Mint 20.3 Cinnamon on HP Pavilion dv6. Whenever I plug a device into the audio jack, it malfunctions somehow - I tried to use some troubleshooting tips on here, but nothing helped much, and I couldn't find a topic on a similar enough issue, so I thought I'd try and ask if anyone has a solution to my problems myself.
Laptop's in-built speakers work fine, however when I try to use headphones, the speech just doesn't come through. I tried to use headphones on Discord calls but I could not hear anyone (first I thought that maybe that could be because the headphones I was using also had an in-built microphone, however when I tried different headphones without a microphone, the problem persisted). The mixing on music also comes out weird, with the sounds that should be in the front of the track (vocals and/or the main melody) not coming through, or the sounds being much more muted than if I just listen to them on the in-built speakers. That's especially annoying when I'm messing around in LMMS, as that means I can't use headphones because the audio will come out weird through them.
A second issue I am having is that when I plug in speakers and if there is nothing playing, they constantly give out feedback. I read here that installing an equalizer might help here, and it somewhat did, however the issue was not fixed (what I ended up doing when i needed the speakers was that turned them off completely when I didn't need the sound - which came through as intended, and also stopped the ).
Is there a fix for that? (Or alternatively: could the issue be the headphone/speaker jack itself?)
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System: Kernel: 5.4.0-132-generic x86_64 bits: 64 compiler: gcc v: 9.4.0
Desktop: Cinnamon 5.2.7 wm: muffin dm: LightDM Distro: Linux Mint 20.3 Una
base: Ubuntu 20.04 focal
Machine: Type: Laptop System: Hewlett-Packard product: HP Pavilion dv6 Notebook PC
v: 049F100000243010000020000 serial: <filter> Chassis: type: 10 serial: <filter>
Mobo: Hewlett-Packard model: 144A v: 65.2E serial: <filter> BIOS: Hewlett-Packard
v: F.13 date: 09/14/2010
Battery: ID-1: BAT0 charge: 0% condition: 55.0/55.1 Wh (100%) volts: N/A/10.8
model: Hewlett-Packard Primary serial: <filter> status: Unknown
CPU: Topology: Dual Core model: Intel Core i3 M 350 bits: 64 type: MT MCP arch: Nehalem
rev: 2 L2 cache: 3072 KiB
flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 18090
Speed: 1419 MHz min/max: 933/2266 MHz Core speeds (MHz): 1: 2139 2: 2109 3: 2039
4: 2083
Graphics: Device-1: Intel Core Processor Integrated Graphics vendor: Hewlett-Packard driver: i915
v: kernel bus ID: 00:02.0 chip ID: 8086:0046
Device-2: AMD Madison [Mobility Radeon HD 5650/5750 / 6530M/6550M]
vendor: Hewlett-Packard driver: radeon v: kernel bus ID: 01:00.0 chip ID: 1002:68c1
Display: x11 server: X.Org 1.20.13 driver: ati,modesetting,radeon unloaded: fbdev,vesa
resolution: 1366x768~60Hz
OpenGL: renderer: Mesa DRI Intel HD Graphics (ILK) v: 2.1 Mesa 21.2.6
direct render: Yes
Audio: Device-1: Intel 5 Series/3400 Series High Definition Audio vendor: Hewlett-Packard
driver: snd_hda_intel v: kernel bus ID: 00:1b.0 chip ID: 8086:3b56
Device-2: AMD Redwood HDMI Audio [Radeon HD 5000 Series] vendor: Hewlett-Packard
driver: snd_hda_intel v: kernel bus ID: 01:00.1 chip ID: 1002:aa60
Sound Server: ALSA v: k5.4.0-132-generic
Network: Device-1: Qualcomm Atheros AR9285 Wireless Network Adapter
vendor: Hewlett-Packard U98Z062.12 802.11bgn driver: ath9k v: kernel port: 4000
bus ID: 02:00.0 chip ID: 168c:002b
IF: wlo1 state: up mac: <filter>
Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet
vendor: Hewlett-Packard driver: r8169 v: kernel port: 2000 bus ID: 03:00.0
chip ID: 10ec:8168
IF: enp3s0 state: down mac: <filter>
Drives: Local Storage: total: 447.13 GiB used: 47.61 GiB (10.6%)
ID-1: /dev/sda vendor: Crucial model: CT480BX500SSD1 size: 447.13 GiB speed: 3.0 Gb/s
serial: <filter>
Partition: ID-1: / size: 438.55 GiB used: 47.61 GiB (10.9%) fs: ext4 dev: /dev/sda5
Sensors: System Temperatures: cpu: 55.0 C mobo: N/A gpu: radeon temp: 55 C
Fan Speeds (RPM): N/A
Repos: No active apt repos in: /etc/apt/sources.list
Active apt repos in: /etc/apt/sources.list.d/megasync.list
1: deb [signed-by=/usr/share/keyrings/meganz-archive-keyring.gpg] https: //mega.nz/linux/repo/xUbuntu_20.04/ ./
Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list
1: deb http: //mirror.xnet.co.nz/pub/linuxmint/packages una main upstream import backport
2: deb http: //mirror.fsmg.org.nz/ubuntu focal main restricted universe multiverse
3: deb http: //mirror.fsmg.org.nz/ubuntu focal-updates main restricted universe multiverse
4: deb http: //mirror.fsmg.org.nz/ubuntu focal-backports main restricted universe multiverse
5: deb http: //security.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse
6: deb http: //archive.canonical.com/ubuntu/ focal partner
Active apt repos in: /etc/apt/sources.list.d/winehq-focal.sources
1: deb [arch=amd64 i386] https: //dl.winehq.org/wine-builds/ubuntu focal main
Info: Processes: 226 Uptime: 1h 12m Memory: 3.64 GiB used: 2.57 GiB (70.6%) Init: systemd
v: 245 runlevel: 5 Compilers: gcc: 9.4.0 alt: 9 Client: Unknown python3.8 client
inxi: 3.0.38 
