Re: 2.6.34-rc1: regression: ^Z no longer stops sound
From: Bill Davidsen
Date: Wed Mar 24 2010 - 12:47:57 EST
Clemens Ladisch wrote:
Pavel Machek wrote:
On Sun 2010-03-14 17:20:13, Bill Davidsen wrote:
Pavel Machek wrote:
In 2.6.33, hitting ^Z stopped mpg123 in a way you'd expect (both on
thinkpad and geode notebook).
On 2.6.34-rc1, hit ^Z and sound starts looping.
That's not new, I have seen it back as far as 2.6.27.25 doing a suspend
in a VM (KVM, no libvirt). But it only happens a few times a year, so I
never chased it. I hate to report an occasional problem in an obsolete
kernel, and I can't reproduce it.
Does it happen repeatably with the new kernel?
It happened reliably so far, yes.
This sounds as if the device has been configured to ignore underruns.
What are the contents of /proc/asound/card0/pcm0p/sub0/{sw_params,status}
when it's looping, and when it's really suspended?
If you can give me a hint how to read /proc when the machine is
suspended, other than waking it up, I'll certainly check the next time I
see it.
But after reading your thought on underruns, I think you right. I see
from a note I wrote myself that I get this while pushing a wav file
over the network to run "play" (from sox) on another machine. Every once
in a while it finds a musical phrase it really likes. I had assumed it
was a bug in sox, but a bug or mis-configure in the device fits all of
the observed cases I've seen.
--
Bill Davidsen <davidsen@xxxxxxx>
"We can't solve today's problems by using the same thinking we
used in creating them." - Einstein
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