On 2015-09-02 16:10, jdow wrote:
On 2015-09-02 05:20, Ian Malone wrote:
On 2 September 2015 at 12:27, Tom Horsley <horsley1953@xxxxxxxxx> wrote:
Every single fedora release, and sometimes even just from
an update where there wasn't a full release, the sound
devices get renumbered or renamed. The last time I
tried to play a movie and send the sound to the optical
output connected to my receiver, this worked:
pacmd set-card-profile 1 off
mplayer -vo gl_nosw -ao alsa:device=hw=1.1 -ac hwdts,hwac3,
-monitoraspect 16:9 -fs "$@"
I tried it last night for the first time in a while, and
it doesn't work. I've had to fiddle this script over and
over again every time sound devices change.
When are we going to get immutable names for sound devices?
If they can do it for ethernet ports, surely they can
do it for sound cards, right? (Though come to think of it
the "immutable" ethernet port names change in every release
as well :-).
cat /proc/asound/cards
0 [PCH ]: HDA-Intel - HDA Intel PCH
HDA Intel PCH at 0xf6420000 irq 82
1 [NVidia ]: HDA-Intel - HDA NVidia
HDA NVidia at 0xf6080000 irq 36
The text in [] can be used as an alsa device name. You can still add
the "," for sub devices.
There is a basic problem here. Cheap USB audio devices tend to behave
"cheap". They have no distinguishing features between the dongles. And
they are not always found in the same order when you reboot the machine
despite their USB address not changing. I have seen this with USB sound
dongles, MIDI dongles, and DVB dongles (as used for ultra cheap SDRs.)
The only solution is to develop a tool that can change serial numbers or
other identification in the dongles, if an eeprom facility is present,
or relying on the user never changing the USB address. In the latter
case the name could be followed by " 0/2/4/6" or "0246" for the USB
address path though root hub and intermediate hubs to the final device.
Sounds kludgey? Yup. But it can work. Meantime it's not useful to
purchase two or three of the same dongle in many cases. Purchase
completely differnet dongles. They may have different names and can
distinguish themselves that way.
{^_^}
At least in KDE, you can set a priority for devices. This allows me to
use a USB gaming headset and it will disable the internal sound card,
just as if I had plugged into a headphone jack.
Robin
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