Hi, My name is Max. I've got some problems using ALSA, a certain type of destruction of sound appears after a prolonged sound output. The destruction is like "bit crush", stutterings, interruptions, etc. Once started, it no longer stops. It starts almost always but only after a prolonged sound output, nearby 24 hours. To reproduce it shurely I use my test wav file and standard speaker-test utility with following options: speaker-test -t wav -w test.wav -r 16000 I've attached test.wav to this mail.
To reproduce this I use a fresh minimal installation of Ubuntu 10.10, command line only, with standard Ubuntu 2.6.35 generic kernel. Minimal installation is made by installing Ubuntu from an "alternate" version of the installation CD. It provide option "command line minimal install" that allow install only base system with command line. So there isn't any desktop applications like Gnome, Pulseaudio, etc. I've used standard Ubuntu package of ALSA with version 1.0.23, and also with compiled 1.0.24.
I've tried to reproduce this behavior on Centos and Fedora (both in single mode, command line only) with Intel HDA chipset, and on Ubuntu with a Realtek chipset. The results was the same, sound destruction after a day of sound output.
Above is the output of speaker-test with parameters: speaker-test -d -c 2 -t wav Before this command my sound test was used during about 6 hours to reproduce the sound destruction: speaker-test -t wav -w test.wav -r 16000
Plug PCM: Linear conversion PCM (S32_LE) Its setup is: stream : PLAYBACK access : RW_INTERLEAVED format : S16_LE subformat : STD channels : 2 rate : 48000 exact rate : 48000 (48000/1) msbits : 16 buffer_size : 16384 period_size : 1024 period_time : 21333 tstamp_mode : NONE period_step : 1 avail_min : 1024 period_event : 0 start_threshold : 16384 stop_threshold : 16384 silence_threshold: 0 silence_size : 0 boundary : 1073741824 Slave: Soft volume PCM Control: PCM Playback Volume min_dB: -51 max_dB: 0 resolution: 256 Its setup is: stream : PLAYBACK access : MMAP_INTERLEAVED format : S32_LE subformat : STD channels : 2 rate : 48000 exact rate : 48000 (48000/1) msbits : 32 buffer_size : 16384 period_size : 1024 period_time : 21333 tstamp_mode : NONE period_step : 1 avail_min : 1024 period_event : 0 start_threshold : 16384 stop_threshold : 16384 silence_threshold: 0 silence_size : 0 boundary : 1073741824 Slave: Direct Stream Mixing PCM Its setup is: stream : PLAYBACK access : MMAP_INTERLEAVED format : S32_LE subformat : STD channels : 2 rate : 48000 exact rate : 48000 (48000/1) msbits : 32 buffer_size : 16384 period_size : 1024 period_time : 21333 tstamp_mode : NONE period_step : 1 avail_min : 1024 period_event : 0 start_threshold : 16384 stop_threshold : 16384 silence_threshold: 0 silence_size : 0 boundary : 1073741824 Hardware PCM card 0 'HDA Intel' device 0 subdevice 0 Its setup is: stream : PLAYBACK access : MMAP_INTERLEAVED format : S32_LE subformat : STD channels : 2 rate : 48000 exact rate : 48000 (48000/1) msbits : 32 buffer_size : 16384 period_size : 1024 period_time : 21333 tstamp_mode : ENABLE period_step : 1 avail_min : 1024 period_event : 0 start_threshold : 1 stop_threshold : 1073741824 silence_threshold: 0 silence_size : 1073741824 boundary : 1073741824 appl_ptr : 0 hw_ptr : 926558209