Dne 22.9.2015 v 00:00 Owen Taylor napsal(a): > On Thu, 2015-09-17 at 23:26 +0200, Germano Massullo wrote: >> Il 17/09/2015 21:13, Andrew Lutomirski ha scritto: >>> To clarify: did you get blasted by music or by video conference >>> sounds? If the music volume got louder, then it sounds like either >>> a >>> straight-up bug in PulseAudio (and a severe and dangerous one at >>> that) >>> or a serious bug in your video conference volume in which it >>> adjusts >>> the volume of streams other than its own. >>> >>> If you got blasted by video conference sounds, then I'd say it's a >>> serious design flaw in PulseAudio. PulseAudio should offer an >>> easy-to-configure maximum volume (probably A-weighted power, but >>> peak >>> level works, too, if considerably less well) on a per-output basis >>> with which to protect your ears. >>> >>> --Andy >> I got blasted from the music because I was not making a conference, I >> only logged into the software, so the music was the only sound I was >> listening to. PulseAudio pushed the master audio level to 100% >> (therefore all applications audio level changed to 100%, due flat- >> volume setting). > I'm not an expert in the subject, but I'm pretty sure this is not how > flat volumes are supposed to work - it doesn't sound like useful > behavior at all! > > Experimenting with GNOME, the model presented to the user seems to be: > > - Each application's volume control separate goes from 0-100% of the > maximum system volume. > - Adjusting each application is independent > - Modifying the system global volume slider proportionally adjusts the > volume of each application > - The system global volume slider is always maintained to be at least > as much as the maximum of any application If this is true, than it is totally unexpected. I would expect that system volume proportionally limits all volumes, e.g. if my system volume is at 50%, the apps 0-100% is actually just 0-50% of system volume. Vít > > NOTE: The system global volume slider is *not the same as the hardware > volume and does not represent a multiplication factor for > application volumes. It's just something that the user can > drag to change the volume of all applications. > > There is danger to the ears if an application assumes that 100% volume > is a safe volume and blindly sets its volume to 100% without user > input. But that only affects that application - one application's > misbehavior never affects another application. > > It sounds like KDE ends up implementing a different model, either > intentionally or because of bugs. It's also possible that lower level > bugs (sound card driver, for example) might be making things misbehave. > > In general, the fact that pulseaudio is configurable in this area is > going to be the source of almost infinite bug chasing, as applications > and desktop environments are "fixed" for one setting or another. It's > also very easy for people to stop investigating problems and say that > "changing the setting fixed it for me." :-( > > - Owen > -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct
