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 = 1;
pos_adj = pos_align;elsepos_adj = ((pos_adj + pos_align - 1) / pos_align) *pos_align;
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