> I'm struggling to get pulseaudio working on a machine with Q77 chipset (<a href="http://device.product.name">device.product.name</a> = "7 Series/C210 Series Chipset Family High Definition Audio Controller",alsa.mixer_name = "Realtek ALC887-VD") but so far I had no success in getting pulseaudio working with 5.1 setup. > Basically, my motherboard supports 2/4/6/8 channels configuration but pulseaudio activates only 2ch config. > I'm using KDE and phonon shows only (using default configurations) left/right channels, (internal stereo audio) > If I force pulseaudio to use all 5.1 channles, adding the following lines > > enable-lfe-remixing = yes > default-sample-channels=6 > default-channel-map = front-left,front-right,rear-left,rear-right,front-center,lfe > > in /etc/pulse/daemon.conf > > pulseaudio shows 5.1 channels (even in kde phonon), but front channels (l,r,c) works fine; lfe no sound and rl and rr are not working, anly a very low volume comes out from front speakers. > > I've tried all suggestions from google, mailing lists and forums as well but no joy so far. > > =============== > Linux 3.9.3 > > $ aplay -L > > sysdefault:CARD=PCH > HDA Intel PCH, ALC887-VD Analog > Default Audio Device > front:CARD=PCH,DEV=0 > HDA Intel PCH, ALC887-VD Analog > Front speakers > surround40:CARD=PCH,DEV=0 > HDA Intel PCH, ALC887-VD Analog > 4.0 Surround output to Front and Rear speakers > surround41:CARD=PCH,DEV=0 > HDA Intel PCH, ALC887-VD Analog > 4.1 Surround output to Front, Rear and Subwoofer speakers > surround50:CARD=PCH,DEV=0 > HDA Intel PCH, ALC887-VD Analog > 5.0 Surround output to Front, Center and Rear speakers > surround51:CARD=PCH,DEV=0 > HDA Intel PCH, ALC887-VD Analog > 5.1 Surround output to Front, Center, Rear and Subwoofer speakers > surround71:CARD=PCH,DEV=0 > HDA Intel PCH, ALC887-VD Analog > 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers > > ========== > > pulseaudio -vvvvv tells a different story, here an excerpt from output; I can provide full output, I didn't posted here to avoid unnecessary cluttering > [...] > D: [pulseaudio] alsa-mixer.c: Looking at profile output:analog-surround-51 > D: [pulseaudio] alsa-mixer.c: Checking for playback on Analog Surround 5.1 (analog-surround-51) > D: [pulseaudio] alsa-util.c: Trying surround51:0 with SND_PCM_NO_AUTO_FORMAT ... > D: [pulseaudio] alsa-util.c: Managed to open surround51:0 > D: [pulseaudio] alsa-util.c: snd_pcm_hw_params_set_channels(6) failed: Invalid argument > D: [pulseaudio] alsa-util.c: Trying surround51:0 without SND_PCM_NO_AUTO_FORMAT ... > D: [pulseaudio] alsa-util.c: Managed to open surround51:0 > D: [pulseaudio] alsa-util.c: snd_pcm_hw_params_set_channels(6) failed: Invalid argument > D: [pulseaudio] alsa-util.c: Trying plug:surround51:0 with SND_PCM_NO_AUTO_FORMAT ... > D: [pulseaudio] alsa-util.c: Managed to open plug:surround51:0 > D: [pulseaudio] alsa-util.c: snd_pcm_hw_params_set_channels(6) failed: Invalid argument <a href="http://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/plain/Documentation/sound/alsa/HD-Audio-Controls.txt">http://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/plain/Documentation/sound/alsa/HD-Audio-Controls.txt</a> For those micro ATX motherboard with three jacks at rear panel to support surround 5.1 Channel Mode This is an enum control to change the surround-channel setup, appears only when the surround channels are available. It gives the number of channels to be used, "2ch", "4ch", "6ch", and "8ch". According to the configuration, this also controls the jack-retasking of multi-I/O jacks. hda-Intel.conf need hooks for set channel mode control for front, surround40, surround51 similar to ich4.conf <a href="https://git.alsa-project.org/?p=alsa-lib.git;a=tree;f=src/conf/cards;hb=HEAD">https://git.alsa-project.org/?p=alsa-lib.git;a=tree;f=src/conf/cards;hb=HEAD</a>