Arch Linux

devrepublic

Member

Registered: 2013-02-06

Posts: 20

[Solved] Volume automatically lowers randomly

Hi everyone,

I've been having this odd problem for a while now and I can't seem to figure out what's causing it. The problem is: the system volume automatically lowers to the same level at random times. By "random," I mean sometimes it's every 2 minutes or so, but more often, every couple of hours or so but it is really unpredictable.

Things I know/I've tried:
- I'm currently using gnome but this happens even with i3 and xmonad
- I have pulseaudio and alsa installed
- The system volume is changed (not app specific) -- the "master" volume in alsamixer is lowered

fuser -v /dev/snd/*

              USER        PID ACCESS COMMAND
/dev/snd/controlC0:  clarence    927 F.... pulseaudio
/dev/snd/controlC1:  clarence    927 F.... pulseaudio
/dev/snd/pcmC0D0p:   clarence    927 F...m pulseaudio

lspci

00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200/2nd Generation Core Processor Family PCI Express Root Port (rev 09)
00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 05)
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 05)
00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b5)
00:1c.4 PCI bridge: Intel Corporation 82801 PCI Bridge (rev b5)
00:1c.5 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 6 (rev b5)
00:1c.6 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 7 (rev b5)
00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 05)
00:1f.0 ISA bridge: Intel Corporation P67 Express Chipset Family LPC Controller (rev 05)
00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset Family SATA AHCI Controller (rev 05)
00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 05)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Cayman PRO [Radeon HD 6950]
01:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Cayman/Antilles HDMI Audio [Radeon HD 6900 Series]
03:00.0 PCI bridge: ASMedia Technology Inc. ASM1083/1085 PCIe to PCI Bridge (rev 01)
05:00.0 USB controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 04)
06:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06)

lshw -c sound

  *-multimedia            
       description: Audio device
       product: Cayman/Antilles HDMI Audio [Radeon HD 6900 Series]
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       physical id: 0.1
       bus info: pci@0000:01:00.1
       version: 00
       width: 64 bits
       clock: 33MHz
       capabilities: pm pciexpress msi bus_master cap_list
       configuration: driver=snd_hda_intel latency=0
       resources: irq:34 memory:fe640000-fe643fff
  *-multimedia
       description: Audio device
       product: 6 Series/C200 Series Chipset Family High Definition Audio Controller
       vendor: Intel Corporation
       physical id: 1b
       bus info: pci@0000:00:1b.0
       version: 05
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list
       configuration: driver=snd_hda_intel latency=0
       resources: irq:33 memory:fe700000-fe703fff

Is there any way to figure out which process is changing the volume and why?

Last edited by devrepublic (2015-03-21 21:26:10)

Alad

Wiki Admin/IRC Op

From: Bagelstan

Registered: 2014-05-04

Posts: 2,420

Website

Re: [Solved] Volume automatically lowers randomly

https://wiki.archlinux.org/index.php/Pu … ication.29

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Mods are just community members who have the occasionally necessary option to move threads around and edit posts. -- Trilby

devrepublic

Member

Registered: 2013-02-06

Posts: 20

Re: [Solved] Volume automatically lowers randomly

Thanks Alad, I don't understand how I missed this when I was looking at that wiki page ....

Just out of curiosity -- is it possible to know which process is trying to change the volume? The issue doesn't occur when I open an app. It occurs randomly even when I'm just watching something.