At Tue, 15 May 2012 16:30:14 +0800, cee1 wrote: > > Witch a patch[1] of PA which dumps playback PCM data, I found the > dumped data(with ./wavformat.py[2] <dumpped_data> to convert to wav > file) is not corrupted. > Since PA uses mmap to transfer PCM data, the driver's DMA buffer > should also be "good". > > It seems related to HDA controller of SB710, I tried HDMI output, and > can reproduce the problem > too(http://dev.lemote.com/files/upload/software/PA-apc/HDMI-corrupted_sound.ogg). If you are using the recent kernel, try snoop=off option of snd-hda-intel driver. The recent AMD and VIA controllers are known to work with the non-snooping mode. Takashi > 2012/5/12 cee1 <fykcee1 at gmail.com>: > > Hi all, > > > > We're using PA on our product, and sometimes audio playback may > > corrupt after adjusting volume. > > > > We found a way to (relatively) easily reproduce the problem: > > 1. Play sample.mp3 through totem in repeat mode. > > 2. In gnome-volume-control, Hardware tap, repeat to shift between "Off > > profile" and "Analog Stereo Duplex profile". > > > > When the problem happens, the corruption continues until I: > > * Do one more shift between "Off profile" and "Analog Stereo Duplex profile". > > * Close totem (close all PA playback clients). > > * Adjust volume. > > > > When the problem happens, open another PA client doing audio playback, > > is also corrupt. > > > > Some additional information: > > * Output of alsa-info.sh on our product: > > http://dev.lemote.com/files/upload/software/PA-apc/alsa-info-lemote > > * PA daemon log: > > http://dev.lemote.com/files/upload/software/PA-apc/pulseaudio.log > > * The corrupted sound: > > http://dev.lemote.com/files/upload/software/PA-apc/corrupted_sound.ogg > > * The sample mp3: http://dev.lemote.com/files/upload/software/PA-apc/sample.mp3 > > > > We've tried PA 1.0-0ubuntu3, 1.1-0ubuntu15 and 2.0, the problem continues. > > > > The problem can also be reproduced on an AMD turion 64 x2 board with > > ubuntu 10.10 and ubuntu 12.04: > > * Output of alsa-info: > > ?ubuntu 10.10(32bit) > > http://dev.lemote.com/files/upload/software/PA-apc/alsa-info-ubuntu-10.10 > > ?ubuntu 12.04(32bit) > > http://dev.lemote.com/files/upload/software/PA-apc/alsa-info-ubuntu-12.04 > > > > Note: > > * The AMD turion 64 x2 board uses the same chipset as our product. > > * gnome-volume-control is removed in ubuntu 12.04, thus we compiled > > it: http://dev.lemote.com/files/upload/software/PA-apc/gnome-volume-control > > ---- > [1] http://dev.lemote.com/files/upload/software/PA-apc/debug/debug-alsa-sink.patch > [2] http://dev.lemote.com/files/upload/software/PA-apc/debug/wavformat.py > > > > -- > Regards, > > - cee1 > _______________________________________________ > Alsa-devel mailing list > Alsa-devel at alsa-project.org > http://mailman.alsa-project.org/mailman/listinfo/alsa-devel >
