linux-kernel - Re: 2.6.34-rc1: regression: ^Z no longer stops sound

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Message-ID: <4BA8CB73.80400@ladisch.de>
Date:	Tue, 23 Mar 2010 15:08:51 +0100
From:	Clemens Ladisch <clemens@...isch.de>
To:	Pavel Machek <pavel@....cz>
CC:	Bill Davidsen <davidsen@....com>, linux-kernel@...r.kernel.org,
	alsa-devel@...a-project.org
Subject: Re: 2.6.34-rc1: regression: ^Z no longer stops sound

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?


Regards,
Clemens
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