Strange question, but this has been bugging me for a long time now. Sometimes when I scroll through my Twitter feed in Firefox, if a gif automatically plays (in a <video> element, so probably .gifv), the output of Quod Libet (or Spotify) seems to get halved. I've noticed this only happens if Quod Libet isn't set to 100% in pavucontrol. When I play a gif, no volume sliders actually move. Both Quod Libet and FireFox show up as "ALSA Plugin", so there is a chance this is a problem with ALSA.

Either way, Google is giving me nothing helpful, other than suggesting I disable flat-volume, but that sounds more about the device output level actually changing - which is not what I'm seeing.


Ok, I set flat-volumes = no (as documented in pulse-daemon.conf) and it seems that might well have been it. What a confusing option!

  • Thanks for posting your solution, but could you please edit and clarify how exactly this setting is changed? What file did you edit? What GUI tool did you use? – terdon Apr 19 '17 at 8:56
  • Worked for me too. I copied /etc/pulse/daemon.conf to $HOME/.pulse/daemon.conf and comment this point out. – user192526 Apr 19 '17 at 11:53

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