On Sun, Jul 1, 2012 at 11:31 AM, Javier Vasquez <j.e.vasquez.v@xxxxxxxxx> wrote: > Hi, > > I'm using a HP EliteBook 8540w laptop. It comes with following audio card: > > 00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset > High Definition Audio (rev 05) > Subsystem: Hewlett-Packard Company Device 1521 > Flags: bus master, fast devsel, latency 0, IRQ 54 > Memory at d7520000 (64-bit, non-prefetchable) [size=16K] > Capabilities: <access denied> > Kernel driver in use: snd_hda_intel > > Udev automatically loads the following modules for this card: > > % lsmod | 'grep' snd > snd_hda_codec_hdmi 23672 4 > snd_hda_codec_idt 55508 1 > snd_hda_intel 24053 7 > snd_hda_codec 94273 3 > snd_hda_codec_hdmi,snd_hda_codec_idt,snd_hda_intel > snd_hwdep 6300 1 snd_hda_codec > snd_pcm 74958 5 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel > snd_page_alloc 7217 2 snd_pcm,snd_hda_intel > snd_timer 18966 3 snd_pcm > snd 58997 17 > snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_hda_codec_idt,snd_pcm,snd_hda_codec,snd_hda_intel > soundcore 5410 1 snd > > I use plain alsa to handle audio. Alsa offers for this card > (alsamixer -V all) the following controls: > > * Master (unmuted - 42) > * Headphone (unmuted - 84) > * Speaker (unmuted - 84) > * PCM (unmuted - 85) > * Mic Jack Mode (Line In) > * Beep (muted - 0) > * Capture ( 80) > * Digital ( 86) > * Muted-LED Mode (Follow Master) > * Mux ( 0) > > To make a loopbak between line-in (mic input but configured as > line-in) and any sort of audio out (speakers, line-out/headphones) I > have to do: > > % arecord | aplay > > Does anyone has this card or similar, and experience the same thing? > I might be mistaken, but I understand through reading different > forums, that this SW loopback using alsa utilities beyond alsamixer > shouldn't be necessary. Is that right, or it's just that alsa doesn't > offer such capability for this card? If someone has figured how to > avoid using the "arecord | aplay" loop, please let me know. > > BTW, I've played around with the controls, including Mux, and there's > no way I can dispense of "arecord | aplay". I haven't added > additional modules, like snd-mixer-oss or snd-pcm-oss, but they don't > sound relevant to me at first (might be mistaken though), :-) Forgot to mention that the "arecord | aplay" introduces a weird echo, so that's why I was looking to avoid using it, :-) I played around with "--disable-resample" and the rate, but I always got the echo. When music sounds, the resulting mix can be bared. When the sound is people talking, then it's hard to understand, :-) -- Javier.
