On 05/27/2013 08:07 AM, Takashi Iwai wrote:
At Wed, 22 May 2013 16:48:58 +0100, Stefano Panella wrote:
Hi everyone,
sorry if this email has been sent twice... ( I sent it once before subscribing)
I am working on some haswell systems running Ubuntu 12.04 and I have a problem if I run aplay -D sysdefault.
when I do:
cat /proc/asound/pcm
I get:
00-03: HDMI 0 : HDMI 0 : playback 1 00-07: HDMI 1 : HDMI 1 : playback 1 00-08: HDMI 2 : HDMI 2 : playback 1 01-00: ALC662 rev3 Analog : ALC662 rev3 Analog : playback 1 : capture 1 01-02: ALC662 rev3 Analog : ALC662 rev3 Analog : capture 1
If I do:
aplay -L | grep sysdefault
I get:
sysdefault:CARD=PCH
where PCH is card number 1 (id = 1)
on most of my systems (non haswell laptops) the default card is number 0
If I run
aplay -D sysdefault
I get:
ALSA lib pcm_dmix.c:1018:(snd_pcm_dmix_open) unable to open slave aplay: main:682: audio open error: No such file or directory
It's because the card 0 contains only HDMI. The sysdefault in HDA-Intel.conf is configured for the analog I/O.
Thanks for answering, what I do not get is what the default configuration is on a freshly installed system (no custom configurations):
- for example, can I assume hw:0,0 is always there and is the default? (apparently not on these haswell machine) - if I run aplay -D sysdefault is it expected to work? - is there any ALSA_CARD variable configured somewhere or is it just supposed to be 0? - how do I know what is it the default card/pcm?
The reasons I am asking these questions is I need to write some SW which will be able to open the default analog playback device and on haswell system I did not find any way to do that apart from using:
aplay -L | grep sysdefault
which will return <CARD> = PCH or Intel or MID etc.. and than I open hw:<CARD>,0 from the C code.
I would like to understand if I can poerform some more tests to understand if this is a genuine problem on haswell systems or if I am just making some wrong assumptions or incorrect use of the cmd_line/API.
Thanks again for helping me on this.
Takashi