On 09/28/2014 05:50 PM, Tanu Kaskinen wrote:
On Sun, 2014-09-28 at 12:41 +0300, Tanu Kaskinen wrote:
On Mon, 2014-09-22 at 11:50 +0800, Hui Wang wrote:
On a machine without fixed connecting audio devices like internal
microphone or internal speaker, and when there is no external audio
devices plugging in, the default source/sink is alsa_input/alsa_output
and there is no input devices/output devices listed in the gnome
sound-setting.
How can the default source/sink be alsa_input/alsa_output if there are
no alsa devices?
Answering myself: probably you meant that there are alsa devices, but
they are currently all unavailable.
Yes, and below is an example:
* index: 2
name: <alsa_input.pci-0000_00_14.2.analog-stereo>
driver: <module-alsa-card.c>
flags: HARDWARE HW_MUTE_CTRL HW_VOLUME_CTRL DECIBEL_VOLUME LATENCY
DYNAMIC_LATENCY
state: SUSPENDED
suspend cause: IDLE
priority: 9959
volume: 0: 21% 1: 21%
0: -40.50 dB 1: -40.50 dB
balance 0.00
base volume: 13%
-52.50 dB
volume steps: 65537
muted: no
current latency: 0.00 ms
max rewind: 0 KiB
sample spec: s16le 2ch 44100Hz
channel map: front-left,front-right
Stereo
used by: 0
linked by: 0
configured latency: 0.00 ms; range is 0.50 .. 371.52 ms
card: 1 <alsa_card.pci-0000_00_14.2>
module: 6
properties:
alsa.resolution_bits = "16"
device.api = "alsa"
device.class = "sound"
alsa.class = "generic"
alsa.subclass = "generic-mix"
alsa.name = "92HD89E2 Analog"
alsa.id = "92HD89E2 Analog"
alsa.subdevice = "0"
alsa.subdevice_name = "subdevice #0"
alsa.device = "0"
alsa.card = "1"
alsa.card_name = "HD-Audio Generic"
alsa.long_card_name = "HD-Audio Generic at 0xfeb40000 irq 16"
alsa.driver_name = "snd_hda_intel"
device.bus_path = "pci-0000:00:14.2"
sysfs.path = "/devices/pci0000:00/0000:00:14.2/sound/card1"
device.bus = "pci"
device.vendor.id = "1022"
device.vendor.name = "Advanced Micro Devices, Inc. [AMD]"
device.product.id = "780d"
device.product.name = "FCH Azalia Controller"
device.form_factor = "internal"
device.string = "front:1"
device.buffering.buffer_size = "65536"
device.buffering.fragment_size = "32768"
device.access_mode = "mmap+timer"
device.profile.name = "analog-stereo"
device.profile.description = "Analog Stereo"
device.description = "Built-in Audio Analog Stereo"
alsa.mixer_name = "IDT 92HD89E2"
alsa.components = "HDA:111d76c7,103c2b17,00100102"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card-pci"
ports:
analog-input-microphone-front: Front Microphone (priority 8500,
latency offset 0 usec, available: no)
properties:
device.icon_name = "audio-input-microphone"
analog-input-microphone-rear: Rear Microphone (priority 8200,
latency offset 0 usec, available: no)
properties:
device.icon_name = "audio-input-microphone"
analog-input-linein: Line In (priority 8100, latency offset 0
usec, available: no)
properties:
active port: <analog-input-linein>
Under this situation, if we connect a bluetooth headset, the gnome
sound-setting will list bluez input/output devices, but they are not
active devices by default. This looks very weird that sound-setting
lists only one input device and one output device, but they are not
active. To change this situation, we add an argument, the policy is
if a new source/sink is connected and current default source/sink's
active_port is AVAILABLE_NO, we let the new added one switch to
default one.
Surely it doesn't make any sense to have the default sink/source point
to non-existing devices if there are other devices available. To me this
seems like something to fix in the core than working around in modules.
I happen to have some code that improves the core default device
tracking. I can submit a patch next week. It might fix your issue too.
My code doesn't take the port availability into account (perhaps it
should, I'm not sure), so probably it won't fix your problem.
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