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My problem is that when I set channel output to "Analog output

surround

...

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5.1" (or 2.1 or 4.1), I hear no sound in front speakers, but in case of

5.1 or

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4.1

You need pulseaudio lfe-filter for 2.1

http://cgit.freedesktop.org/pulseaudio/pulseaudio/log/?qt=grep&q=lfe-fil...

External 5.1 and 4.1 worked fine without lfe-filter. Fedora doesn't

package lfe-

filter and I'm more interested to get my 5.1 configuration back.

...

do you mean surround21 need 6 channel instead of channels with 5.1

internal

...

/external speaker ?

http://git.alsa-project.org/?p=alsa-lib.git;a=commitdiff;h=48f1b308cc66152eb

...

6db66742dd0d08d888cda8d;hp=5c4cd46810cef8850b037fca9e38ffd43b0bff22

No. When in KDE channel output is set to 2.1 it makes no difference what

is set

in alsamixer. When my external speakers are disconnected built-in front

left

and front right works on my laptop, but built-in subwoofer doesn't work

There

is no difference what channel output is set in alsamixer.

My laptop has built-in front left, front right, rear left, rear right and subwoofer and something is strange. When I set channel output to 5.1 or 4.1 and external speakers are disconnected, then front left and front right work as expected but

built-in

subwoofer is heard only if I test rear left channel (wrong channel

mapping?)

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/pc...

Seem only two pairs of stereo speakers and internal subwoofer at left channel before this patch

ALSA: hda - Enable surround speakers (when line out is also present)