[alsa-devel] [RFC PATCH 1/2] ALSA: hda - Fix "PCM" name being used on one DAC when there are two DACs

[Raymond Yau]

> >
> > >>
> > >>
> > >>  > >
> > >>  > > >> >
> > >>  > > >> > In the scenario where there is one "Line Out", one
"Speaker"
> > >> and one
> > >>  > > >> > "Headphone", and there are only two DACs, two outputs will
> > >> share a DAC.
> > >>  > > >> > Currently any mixer on such a DAC will get the "PCM" name,
> > >> which is
> > >>  > > >> > misleading. Instead use "Headphone+LO" or "Speaker+LO" to
> > better
> > >>  > > >> > specify what the volume actually controls.
> > >>  > > >>
> > >>  > > >> Are there any examples ?
> > >>  > > >>
> > >>  > > >
> > >>  > > > I used "hda-emu
> > >>  > >
codecs/canonical/alc3226-dell-precision-m2800-ccert-201404-14986 -i
> > >> 1" when
> > >>  > > developing the patches.
> > >>  > > >
> > >>  > > > I don't have any hardware available myself that exposes this
> > >> behavior,
> > >>  > > but I can maybe fake one with hdajackretask, if that counts...
> > >>  > > >
> > >>  > >
> > >>  > > How about adding these names to slaves of virtual master
> > >> volume/switch ?
> > >>  > >
> > >>  > > hdajackretask won't help if the topology of the codecs are
> > different
> > >>  > >
> > >>  > > Seem the badness still prevent the driver to support surround
5.1
> > with
> > >>  > > three rear panel jacks, internal speaker and front panel
headphone
> > for
> > >>  > > Thinkcenter A58 using alc662
> > >>  > >
> > >>  > >
> > >>
> >
https://www.mail-archive.com/alsa-user@lists.sourceforge.net/msg29203.html
> > >>  > >
> > >>  > > Why 3stack desktops with 6 channels codecs not using
> > >> "Headphone+LO"  or
> > >>  > > "Speaker+LO" ?
> > >>  >
> > >>  > The problem is just the lack of DACs, so it cannot cover all three
> > >>  > outputs, no matter how the pins are chosen.  That is, it's no 6
> > >>  > channels at all but 4 channels at most.
> > >>  >
> > >>  >
> > >>
> > >> http://shop.lenovo.com/us/en/desktops/thinkcentre/a-series/a58/
> > >>
> > >> The technical specification of a58
> > >>
> > >> 2 pin internal speaker connector
> > >> Alc662 5.1
> > >>
> > >> https://bbs.archlinux.org/viewtopic.php?id=156433
> > >>
> > >> Seem windows support surround 5.1
> > >
> > >
> > > Raymond, there can certainly be cases which this patch does not cover
-
> > after all, it's mostly a band aid given the lack of topology
information -
> > but do you see cases where this patch actually causes a *regression*? If
> > so, could you point me to alsa-info for the machine where this patch
causes
> > a regression?
> > >
> >
> >
www.realtek.com.tw/products/productsView.aspx?Langid=1&PNid=24&PFid=27&Level=5&Conn=4
> >
> > I expect those desktop with 2+2 HD Audio codec support independent
headphone
> >
> > This mean the driver should not create "Lineout+HP" Playback volume
> >
> > Line out and headphone cannot share same DAC
>
> Do you have a pincfg representing this?  Then we can check it easily
> via hda-emu.
>

http://git.kernel.org/cgit/linux/kernel/git/tiwai/hda-emu.git/tree/codecs/canonical/alc221--hp-prodesk-400-g1-sff-ccert-201408-15383?id=HEAD

Refer to user manual

Multi-streaming can be enabled in the Realtek control panel to allow
independent audio streams to be sent to/from the front and rear jacks