> > My problem is that when I set channel output to "Analog output surround 5.1" > (or 2.1 or 4.1), I hear no sound in front speakers, but in case of 5.1 or 4.1 > I can hear sound in rear speakers. I use kernel 3.19.5 and it didn't happen in > earlier kernels that is 3.18 and in 3.17 for sure. > > My configuration is: > OS: Fedora 21 64 bit > SoundCard: ALC888 > Model name: acer-aspire-4930g > Laptop: Acer Aspire 5930g > Speakers: external 5.1 with 3 jacks > Sound channel configuration module is standard configuration module from KDE. > > Additional info: > 1) When channel output is 5.1 and I unplug green jack and leave two others > jacks connected then I can hear sound in laptop internal speakers. > 2) Earlier (kernel 3.18 and 3.17) I didn't have possibility to choose 2.1 > configuration and additionally to 4.1 configuration I could also choose 4.0 > configuration. You have to provide pulseaudio verbose log If driver create channel mode which allow you to support surround5.1 with your headphone, line in and mic jack It is possible for pulseaudio mute two of your external 5.1 speaker when headphone jack is plugged <a href="http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/mixer/paths/analog-output-headphones.conf">http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/mixer/paths/analog-output-headphones.conf</a> [Element Rear] switch = off volume = off [Element Surround] switch = off volume = off [Element Center] switch = off volume = off [Element LFE] switch = off volume = off