The business of where the alsamixer-reported items come from has puzzled me for a while. Over the past two and a half years I've been running ubuntu on an HP tx2100 pavilion notebook. I've had to compile alsa after each ubuntu upgrade or kernel change. And with exaxtly the same hardware I've not had the same setup reported twice :-) In particular the array microphone has beeen a) not reported at all b)reported as Atapi mic (in which case it works perfectly and c)reported as mic (with varying results). Headphone detection comes and goes also. When the headphone is detected, speakers may or may not be muted on headphone insertion. I spent much of my career writing acoustic processing software so I do have an interest. I wish I had the time to rummage properly in the internals and see what's going on. IMO hammering realtime sound processing out of the unix architecture (compared to say BeOS) was always going to be a challenge so I'm impressed that sound works so well. Cheers Pat On 2/5/11, Torquil Macdonald Sørensen <torquil@xxxxxxxxx> wrote: > On 05/02/11 18:33, Bill Unruh wrote: >> On Sat, 5 Feb 2011, Torquil Macdonald Sørensen wrote: >> >>> Hi! >>> >>> On my Asus X5DID laptop I have an internal microphone, a "mic in", as >>> well as a >>> "line out", and of course internal speakers. The sound card is: >>> >>> tmac@asus ~$ lspci -s 02:00.1 -v >>> 02:00.1 Audio device: nVidia Corporation High Definition Audio >>> Controller (rev a1) >>> Subsystem: ASUSTeK Computer Inc. Device 1312 >>> Flags: bus master, fast devsel, latency 0, IRQ 17 >>> Memory at faf7c000 (32-bit, non-prefetchable) [size=16K] >>> Capabilities: <access denied> >>> Kernel driver in use: HDA Intel >>> >>> In the alsamixer "playback" section I have: >>> >>> Master, Headphone, Speaker, PCM, Mic Boost, Beep, Internal Mic Boost 1 >>> >>> In the "recording" section I have: >>> >>> Mic Boost, Capture, Capture 1, Digital, Internal Mic Boost 1 >>> >>> I have a couple of questions: >>> >>> 1) What are the "Mic Boost" and "Internal Mic Boost 1" faders doing in >>> the >>> "playback section"? I have no "mic through" signal anyway, i.e. I >>> cannot monitor >>> the microphone input (internal mir or mic in) in realtime without >>> routing the >>> signal manually using e.g. jackd. They don't seem to be related to >>> playback. >> >> AFAIK, the mixer items are as reported by the cards. Ie, it is not alsa >> that >> presents these but the card manufacturer, so it is the card manufacturer >> that >> would have to explain them. > > Thanks, I did not know that. Actually, I'll look into the possibility of > changing the listed faders in the mixer, but it's not a big deal as long as > I > remember how to use them. > > I must say, it is really cool to get an answer about this from a notable > physicist as such as yourself! I have learned a bit about the Unruh effect > earlier, and I think another student did a Master's degree on that subject > under > Prof. John Magne Leinaas here in Oslo, so I recognized your name > immediately... > > Well, thanks again for the info. > > Best regards > Torquil Sørensen > > ------------------------------------------------------------------------------ > The modern datacenter depends on network connectivity to access resources > and provide services. The best practices for maximizing a physical server's > connectivity to a physical network are well understood - see how these > rules translate into the virtual world? > http://p.sf.net/sfu/oracle-sfdevnlfb > _______________________________________________ > Alsa-user mailing list > Alsa-user@xxxxxxxxxxxxxxxxxxxxx > https://lists.sourceforge.net/lists/listinfo/alsa-user > -- Sent from my mobile device "If I knew what I was doing I wouldn't call it research" - Albert Einstein ------------------------------------------------------------------------------ The modern datacenter depends on network connectivity to access resources and provide services. The best practices for maximizing a physical server's connectivity to a physical network are well understood - see how these rules translate into the virtual world? http://p.sf.net/sfu/oracle-sfdevnlfb _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
