[alsa-devel] 100.0% power usage of Device Audio codec (HDA) on wake

Takashi Iwai tiwai at suse.de
Fri Nov 16 17:04:03 CET 2012

At Fri, 16 Nov 2012 15:23:06 +0100,
Tomas Pospisek wrote:
> Hello,
> The kernel of the upcoming Debian release and some
> recent kernels of Ubuntu seem to be suffering from HDA
> running at full force upon wakeup and producing
> a lot of heat (keeping the fan spinning loudly).

What do you mean "wakeup"?  Which kernel are you using?  Which codec
and HD-audio controller chips?  Please elaborate a bit more instead of
a bug track URL.  This will save lots of time for other people.

If it's really a CPU usage, try to run perf and check what is spinning



> The bug tracking can be found here:
>     https://bugs.launchpad.net/ubuntu/+source/linux/+bug/877560
> is there anything known about this problem? What the root of
> the problem is? How to solve it? Are there patches? Are there
> kernels that have fixed the problem? Are there workarounds?
> The problem seems to be impacting quite a few users.
> *t
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