[alsa-devel] Timer instability

Takashi Iwai tiwai at suse.de
Wed Feb 25 14:36:23 CET 2009

At Wed, 25 Feb 2009 12:34:37 +0000,
Clive Messer wrote:
> On Wednesday 25 Feb 2009 10:22:26 Takashi Iwai wrote:
> > Could you check the raw hwptr and applptr values surrounding the error
> > time, e.g. with the patch to alsa-lib below?
> > If it's really hwsync that makes values unstable, we have to see the
> > value skips there...
> Does this help? Log attached. (head -n 100, tail -n 100)

Thanks.  At least it shows the values in hwsync ioctl are sane.
So something wrong in elsewhere.

Could you check whether this error happens with sync_ptr_ioctl flag
in PCM config?  For example, define the below in ~/.asoundrc,

	pcm.mytest {
		type hw
		card 0
		sync_ptr_ioctl true

Then run with PCM "mytest".


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