Ok, the front channel is now working, but I don't know why.At Mon, 02 Feb 2004 17:41:02 +0000, James Courtier-Dutton wrote:
In alsa 0.9.8, the snd-intel8x0 worked find with my MB. An ICH5 with ALC650. With alsa 1.0.2, I get: - device: front -> no-sound output device: surround40: -> Only sound on rear left, and rear right. device: surround51: -> Only sound on rear left, and rear right, center, lfe
So, in all cases there is never sound on the front speakers.
The same problem has happened to a person with an ICH2, which only has front speakers, so they get no sound at all.
I am investigating, and I suspect that the mixer has just lost the mixer/mute for the front speakers.
hmm, it looks like a generic problem of intel8x0 with ALC65x. in the recent version, the detection and implementation of PCM streams have been changed, and i guess it's broken for these codecs.
Is there a tool where I can adjust ac97 registers directly through a IOCTL or something, for test purposes?
% cat /proc/asound/card0/codec97#0/ac97#0-0+regs
we'll need to trace the behavior in snd_ac97_pcm_*() functions...
Takashi
One thing that is definitely broken is sample rate conversion.
E.g. Open card at rate 44100, device="hw:0", fails saying rate 44100 not supported.
Open card at rate 48000, device="hw:0" works.
Now, open card at rate 44100, device "plughw:0" succeeds, but then the snd_pcm_writei() calls just hangs at poll()
#0 0x401a5ab8 in *__GI___poll (fds=0x402049a8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:82
#1 0x4006abd4 in snd_pcm_wait (pcm=0x8054630, timeout=-4) at pcm.c:2044
#2 0x400706f8 in snd_pcm_write_areas (pcm=0x8054630, areas=0xbfffe9d4, offset=0, size=71, func=0x4007a480 <snd_pcm_plugin_write_areas>)
at pcm.c:6041
#3 0x4007a88d in snd_pcm_plugin_writei (pcm=0x8054630, buffer=0xfffffffc, size=4294967292) at pcm_plugin.c:436
#4 0x40068dd7 in snd_pcm_writei (pcm=0x7fffffff, buffer=0x8054810, size=1) at pcm_local.h:368
#5 0x080495e0 in write_loop (handle=0x80544b8, channel=0, periods=3105, samples=0x8054810) at speaker-test.c:289
#6 0x08049b73 in main (argc=4, argv=0xbfffee54) at speaker-test.c:445
Once thing I have noticed, is that with the alc650, we used to have VRA (alsa 0.9.8), but the 1.0.2 intel8x0 driver ignores the VRA and fixes itself at 48000.
So, before I never needed the sample rate converters, but as it now fixes the rate at 48000, I need the sample rate converters, and they don't actually work.
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