2012/6/28 David Henningsson david.henningsson@canonical.com:

For kernel 3.6, "phantom jack" kctls have been added. They serve as a marker that a particular port exist. They were made so we can detect that there actually are speakers and internal mic on a laptop, even if there are no other indications (volume controls etc).

Signed-off-by: David Henningsson david.henningsson@canonical.com

It seem that there will be numerous phantom ports created

e.g. two internal mic phantom ports, spdif and spdif in, cd on the intel d975 desktop

./hda-emu codecs/stac9274d-intel-d975

CTRL: add: Front Headphone Jack:0 JACK created Front Headphone, type 1 JACK report Front Headphone, status 0 CTRL: add: Front Mic Jack:0 JACK created Front Mic, type 2 JACK report Front Mic, status 0 CTRL: add: Rear Mic Jack:0 JACK created Rear Mic, type 2 JACK report Rear Mic, status 0 CTRL: add: Internal Mic Phantom Jack:0 CTL Notify: Internal Mic Phantom Jack:0, mask=1 CTRL: add: Internal Mic Phantom Jack:1 CTL Notify: Internal Mic Phantom Jack:1, mask=1 CTRL: add: Line Jack:0 JACK created Line, type 32 JACK report Line, status 0 CTRL: add: CD Phantom Jack:0 CTL Notify: CD Phantom Jack:0, mask=1 CTRL: add: SPDIF Phantom Jack:0 CTL Notify: SPDIF Phantom Jack:0, mask=1 CTRL: add: SPDIF In Phantom Jack:0 CTL Notify: SPDIF In Phantom Jack:0, mask=1