2012-7-13 下午10:31 於 "David Henningsson" <<a href="mailto:david.henningsson@canonical.com">david.henningsson@canonical.com</a>> 寫道： > > On 06/28/2012 10:47 PM, David Henningsson wrote: >> >> On 06/28/2012 06:44 PM, Tanu Kaskinen wrote: >>> >>> On Thu, 2012-06-28 at 16:27 +0200, David Henningsson wrote: >>>> >>>> Some ASUS netbooks, such as the 1015 CX, have only one 3.5 mm jack, >>>> but it can be used either as a headphone or as a mic (but not both >>>> simultaneously). >>>> >>>> This patch adds support for the "Headphone Mic" path that is used >>>> on these devices, so that we can use the jack as an external mic, and >>>> doing so without muting the speaker. >>>> >>>> BugLink: <a href="https://bugs.launchpad.net/bugs/1018262">https://bugs.launchpad.net/bugs/1018262</a> >>>> Signed-off-by: David Henningsson <<a href="mailto:david.henningsson@canonical.com">david.henningsson@canonical.com</a>> >>> >>> >>> The patch looks good to me, but I have a question: with this "Headphone >>> Mic", will the associated input and output paths always have "unknown" >>> as the availability state when there's something plugged in? >> >> >> "Unknown" when it is plugged in, and "no" when it is unplugged. Maybe I >> should add the state.unplugged as well for clarity. >> >>> Does alsa >>> provide any means to figure out which one actually is being used, and if >>> so, what are we missing in pulseaudio to make this work better? >> >> >> There's no autodetection by the hardware of what has been plugged in. >> >> The way it's implemented in ALSA is that there is a "Input Source" kctl, >> and if you set it to "Headphone Mic" the jack retasks as mic, and if you >> set it to "Internal Mic", the jack retasks as headphone. but there is no input source control when there are one or two input sources(auto-mic) and the driver does not create "ext mic boost" for node 0x1a >> >> In Windows 7, there is a popup when you plug in asking "Hey, what did >> you plug in?" and you select Headphone or Mic manually that way. I guess >> that would provide some extra level of elegance, but at least having a >> way of using the external mic would be good enough for me at this point. is it possible to create a switch to retask the jack as hp or mic since the user should be able to do this without pulseaaudio ?