[alsa-devel] bug in playing 6-channel sound
Some five years ago, the following post
https://mailman.alsa-project.org/pipermail/alsa-devel/2014-February/072265.h...
reported a failure to play six-channel sound, that could be worked around by setting the prealloc value for the device to various values *other than* the default 64.
I have just run into this playing a movie from my laptop (Thinkpad Yoga X1, Intel HDA PCH sound card outputting through HDMI) running Xubuntu 18.04, up to date as at the time of posting.
I see exactly the same problem as in that post, and the same workaround works for me - I tried prealloc values 63,65,32,128, and any of them is ok.
I'm a bit baffled that such a problem has survived for several years.
If any developer would like me to provide debugging information, please get in touch - I have some time available at present, but not enough to learn ALSA and debug it myself!
I will remain subscribed to the list for a few weeks to read any followups.
On Thu, 04 Jul 2019 12:46:20 +0200, Julian Bradfield wrote:
Some five years ago, the following post
https://mailman.alsa-project.org/pipermail/alsa-devel/2014-February/072265.h...
reported a failure to play six-channel sound, that could be worked around by setting the prealloc value for the device to various values *other than* the default 64.
I have just run into this playing a movie from my laptop (Thinkpad Yoga X1, Intel HDA PCH sound card outputting through HDMI) running Xubuntu 18.04, up to date as at the time of posting.
I see exactly the same problem as in that post, and the same workaround works for me - I tried prealloc values 63,65,32,128, and any of them is ok.
I'm a bit baffled that such a problem has survived for several years.
Maybe just because most distros use the larger preallocation size via kconfig option since long time ago. It's kept to 64 as default in the source tree just for a historical reason.
Takashi
participants (2)
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Julian Bradfield -
Takashi Iwai