> > 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
ALC662 has three DACs, so it's a different problem, if any. ALC269 and its variants have only two DACs.
These two patches not only affect those four channels hda codecs notebook with dock station or desktop with internal speaker, it also affect some codecs in hda-emu/codecs
1) two channels hda codec such as stac9200 (e.g Dell precision 490 workstation) 2) 8 channels codecs such as stac9228, cmi9880 (e.g. lg-lw60 and dell xps)
The proposed patches still not able to handle the case when line out , headphone and speaker share the same volume control
Refer to hardware mainteance manual of a58, there is only one internal speaker , it is most likely a mono speaker if it use a two pin internal speaker connector
http://www.desktopreview.com/default.asp?newsID=760&Review+Lenovo+ThinkC...
Here you can see the built-in speaker in the lower right
It is unlikely for stereo speaker to use two pin connector
Other Thinkcenter with 6 channels ad1986a has enough volume controls for line out, headphone and speaker
https://answers.launchpad.net/ubuntu/+source/alsa-driver/+question/146830