Takashi,
with aplay things are a bit more differentiated:
bdl_pos_adj=0 and 1 are as described below
bdl_pos_adj=32
device "default" works
device "plughw:0,0" works or does not work, may be depending on the sound format. For a nonworking file, here is the output of the files /proc/asound/card0/pcm0p/sub0/*:
/proc/asound/card0/pcm0p/sub0/hw_params:
access: RW_INTERLEAVED
format: S16_LE
subformat: STD
channels: 2
rate: 44100 (44100/1)
period_size: 4096
buffer_size: 16384
/proc/asound/card0/pcm0p/sub0/info:
card: 0
device: 0
subdevice: 0
stream: PLAYBACK
id: ALC883 Analog
name: ALC883 Analog
subname: subdevice #0
class: 0
subclass: 0
subdevices_count: 1
subdevices_avail: 0
/proc/asound/card0/pcm0p/sub0/prealloc:
64
/proc/asound/card0/pcm0p/sub0/prealloc_max:
1024
/proc/asound/card0/pcm0p/sub0/status:
state: RUNNING
trigger_time: 2795.506618360
tstamp : 2797.052537640
delay : 16384
avail : 0
avail_max : 818
-----
hw_ptr : 818
appl_ptr : 17202
/proc/asound/card0/pcm0p/sub0/sw_params:
tstamp_mode: NONE
period_step: 1
avail_min: 4096
start_threshold: 16384
stop_threshold: 16384
silence_threshold: 0
silence_size: 0
boundary: 4611686018427387904
the same file played with mmap (aplay -D plughw:0,0 --mmap soundfile) also gives no sound.
/proc/asound/card0/pcm0p/sub0/hw_params:
access: MMAP_INTERLEAVED
format: S16_LE
subformat: STD
channels: 2
rate: 44100 (44100/1)
period_size: 4096
buffer_size: 16384
/proc/asound/card0/pcm0p/sub0/info:
card: 0
device: 0
subdevice: 0
stream: PLAYBACK
id: ALC883 Analog
name: ALC883 Analog
subname: subdevice #0
class: 0
subclass: 0
subdevices_count: 1
subdevices_avail: 0
/proc/asound/card0/pcm0p/sub0/prealloc:
64
/proc/asound/card0/pcm0p/sub0/prealloc_max:
1024
/proc/asound/card0/pcm0p/sub0/status:
state: RUNNING
trigger_time: 2948.343350480
tstamp : 2949.758334160
delay : 16384
avail : 0
avail_max : 0
-----
hw_ptr : 0
appl_ptr : 16384
/proc/asound/card0/pcm0p/sub0/sw_params:
tstamp_mode: NONE
period_step: 1
avail_min: 4096
start_threshold: 16384
stop_threshold: 16384
silence_threshold: 0
silence_size: 0
boundary: 4611686018427387904
Your patch really solves this problem for bdl_pos_adj=32 (for bdl_pos_adj=0 and 1 unchanged). Thanks!
Cheers,
Hans-Frieder
Am Dienstag, 15. Juli 2008 schrieb Takashi Iwai:
> At Sun, 13 Jul 2008 08:45:55 +0200,
> Hans-Frieder Vogt wrote:
> >
> > Just a few more things to add (maybe it gets clearer):
> > On a GeForce 8200 board (MCP78S), using the pcm example program from alsa-lib-1.0.17rc2/test,
> > kernel driver version 1.0.17rc3:
> > (ignoring my general sound distortion problem which I will address again in another post)
> >
> > bdl_pos_adj=0
> > both devices "default" and "plughw:0,0" work, i.e. give continuous sound
> >
> > bdl_pos_adj=1
> > bdl_pos_adj=2
> > bdl_pos_adj=8
> > no sound, pcm seems to gets stuck (example program does not return)
> >
> > bdl_pos_adj=16
> > bdl_pos_adj=32
> > bdl_pos_adj=64
> > bdl_pos_adj=128
> > bdl_pos_adj=256
> > bdl_pos_adj=512
> > bdl_pos_adj=1024
> > bdl_pos_adj=2048
> > default device: works, i.e. sound
> > plughw:0,0: no sound, pcm gets stuck
> >
> > bdl_pos_adj=4096
> > bdl_pos_adj=8192
> > ALSA /home/haef/Treiber/alsa-driver-1.0.17rc3/pci/hda/../../alsa-kernel/pci/hda/hda_intel.c:1056: Too big adjustment 4096
> > default device: works, i.e. sound
> > plughw:0,0: just one beep (approx. 0.5s of sound), then pcm gets stuck
> >
> > Any ideas?
>
> Thanks, that's really good to know. Does this happen with aplay, too?
>
> Now you don't need to play so many bdl_pos_adj values any more.
> Checking 1 and 32 should suffice.
>
> Could you check /proc/asound/card0/pcm0p/sub0/* at non-working time
> with bdl_pos_adj=32?
>
> Also, try the patch below. If my guess is right, the problem is
> unaligned period size.
>
>
> Takashi
>
> ---
> diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
> index 16715a6..ef9f072 100644
> --- a/sound/pci/hda/hda_intel.c
> +++ b/sound/pci/hda/hda_intel.c
> @@ -1047,9 +1047,13 @@ static int azx_setup_periods(struct azx *chip,
> pos_adj = bdl_pos_adj[chip->dev_index];
> if (pos_adj > 0) {
> struct snd_pcm_runtime *runtime = substream->runtime;
> + int pos_align = pos_adj;
> pos_adj = (pos_adj * runtime->rate + 47999) / 48000;
> if (!pos_adj)
> - pos_adj = 1;
> + pos_adj = pos_align;
> + else
> + pos_adj = ((pos_adj + pos_align - 1) / pos_align) *
> + pos_align;
> pos_adj = frames_to_bytes(runtime, pos_adj);
> if (pos_adj >= period_bytes) {
> snd_printk(KERN_WARNING "Too big adjustment %d\n",
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>
>
--
--
Hans-Frieder Vogt e-mail: hfvogt <at> gmx .dot. net
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