this is my first post here, I apologize if I am doing sth. wrong.
My monitor is connected via a HDMI to my graphic card (GeForce GTX 650Ti) but I can't hear the sound from the monitor loudspeakers if playing e.g. a Youtube video. However, as soon as i plug a 3.5 mm cable into the headphone socket at the front of my PC the sound comes from the monitor. To be precise: the 3.5 mm cable is only plugged into the headphone socket, the other end of this cable is not connected with anything. Nevertheless this is neeeded to get the sound from the monitor speakers. So I don't understand why this is necessary and would like to configure (or what else might be needed) correctly to have sound without a loose cable connected to the headphone socket.
I am a Linux newbie, thus please forgive me if I have overseen a very easy or dumb thing ...
Best regards!
Quick System Info:
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Snapshot created on: 20210115_1141
System: Host: <filter> Kernel: 5.8.0-3-amd64 x86_64 bits: 64 compiler: N/A
parameters: BOOT_IMAGE=/boot/vmlinuz-5.8.0-3-amd64
root=UUID=<filter> ro quiet splash
Desktop: KDE Plasma 5.14.5 wm: kwin_x11 dm: SDDM
Distro: MX-19.4_KDE_x64 patito feo November 11 2020 base: Debian GNU/Linux 10 (buster)
Machine: Type: Desktop Mobo: ASRock model: Z87 Pro3 serial: <filter> BIOS: American Megatrends
v: P2.20 date: 07/03/2013
Battery: Device-1: hidpp_battery_0 model: Logitech M570 serial: <filter> charge: 90%
rechargeable: yes status: Discharging
CPU: Topology: Quad Core model: Intel Core i5-4670K bits: 64 type: MCP arch: Haswell
family: 6 model-id: 3C (60) stepping: 3 microcode: 28 L2 cache: 6144 KiB
flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 27192
Speed: 3106 MHz min/max: 800/3800 MHz Core speeds (MHz): 1: 3106 2: 3259 3: 2773 4: 2862
Vulnerabilities: Type: itlb_multihit status: KVM: VMX disabled
Type: l1tf mitigation: PTE Inversion; VMX: conditional cache flushes, SMT disabled
Type: mds mitigation: Clear CPU buffers; SMT disabled
Type: meltdown mitigation: PTI
Type: spec_store_bypass
mitigation: Speculative Store Bypass disabled via prctl and seccomp
Type: spectre_v1 mitigation: usercopy/swapgs barriers and __user pointer sanitization
Type: spectre_v2 mitigation: Full generic retpoline, IBPB: conditional, IBRS_FW, STIBP:
disabled, RSB filling
Type: srbds mitigation: Microcode
Type: tsx_async_abort status: Not affected
Graphics: Device-1: NVIDIA GK106 [GeForce GTX 650 Ti] vendor: Gigabyte driver: nvidia v: 470.63.01
bus ID: 01:00.0 chip ID: 10de:11c6
Display: x11 server: X.Org 1.20.10 driver: nvidia
unloaded: fbdev,modesetting,nouveau,vesa alternate: nv compositor: kwin_x11
resolution: 2560x1080~60Hz
OpenGL: renderer: NVIDIA GeForce GTX 650 Ti/PCIe/SSE2 v: 4.6.0 NVIDIA 470.63.01
direct render: Yes
Audio: Device-1: Intel 8 Series/C220 Series High Definition Audio vendor: ASRock
driver: snd_hda_intel v: kernel bus ID: 00:1b.0 chip ID: 8086:8c20
Device-2: NVIDIA GK106 HDMI Audio vendor: Gigabyte driver: snd_hda_intel v: kernel
bus ID: 01:00.1 chip ID: 10de:0e0b
Sound Server: ALSA v: k5.8.0-3-amd64
Network: Device-1: Realtek RTL8169 PCI Gigabit Ethernet driver: r8169 v: kernel port: d000
bus ID: 04:00.0 chip ID: 10ec:8169
IF: eth0 state: up speed: 100 Mbps duplex: full mac: <filter>
Drives: Local Storage: total: 1.02 TiB used: 8.72 GiB (0.8%)
ID-1: /dev/sda vendor: Samsung model: SSD 840 EVO 120GB size: 111.79 GiB block size:
physical: 512 B logical: 512 B speed: 6.0 Gb/s serial: <filter> rev: BB0Q scheme: MBR
ID-2: /dev/sdb vendor: Western Digital model: WD10EARS-00Y5B1 size: 931.51 GiB
block size: physical: 512 B logical: 512 B speed: 3.0 Gb/s serial: <filter> rev: 0A80
scheme: MBR
Partition: ID-1: / raw size: 109.76 GiB size: 107.53 GiB (97.97%) used: 8.72 GiB (8.1%) fs: ext4
dev: /dev/sda1
ID-2: swap-1 size: 2.00 GiB used: 0 KiB (0.0%) fs: swap swappiness: 15 (default 60)
cache pressure: 100 (default) dev: /dev/sda2
Sensors: System Temperatures: cpu: 35.0 C mobo: N/A gpu: nvidia temp: 30 C
Fan Speeds (RPM): N/A gpu: nvidia fan: 30%
Repos: No active apt repos in: /etc/apt/sources.list
Active apt repos in: /etc/apt/sources.list.d/debian-stable-updates.list
1: deb http://deb.debian.org/debian buster-updates main contrib non-free
Active apt repos in: /etc/apt/sources.list.d/debian.list
1: deb http://deb.debian.org/debian buster main contrib non-free
2: deb http://deb.debian.org/debian-security buster/updates main contrib non-free
Active apt repos in: /etc/apt/sources.list.d/mx.list
1: deb http://ftp.halifax.rwth-aachen.de/mxlinux/packages/mx/repo/ buster main non-free
2: deb http://ftp.halifax.rwth-aachen.de/mxlinux/packages/mx/repo/ buster ahs
No active apt repos in: /etc/apt/sources.list.d/various.list
Info: Processes: 200 Uptime: 7m Memory: 15.57 GiB used: 1.06 GiB (6.8%) Init: SysVinit v: 2.93
runlevel: 5 default: 5 Compilers: gcc: 8.3.0 alt: 8 Shell: quick-system-in
running in: quick-system-in inxi: 3.0.36
