From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Henningsson <david.henningsson@canonical.com>
Subject: Re: How to show hda trace events in a self-built
	kernel?
Date: Wed, 23 Apr 2014 10:31:39 +0200
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To: "Lin, Mengdong" <mengdong.lin@intel.com>, "alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>
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On 2014-04-23 09:35, Lin, Mengdong wrote:
> Hi,
>
> How to show hda trace events in a self-built kernel?
>
> With a self-built kernel under Ubuntu 13.04 or 13.10, I enabled hda
> trace events by
>
> #cd /sys/kernel/debug/tracing/
>
> #echo 1 > events/hda/enable
>
> #echo 1 > events/had_intel/enable
>
> Then I check the codec proc entry and run =93cat trace=94. But I got no
> output of the hda trace events.

Did you forget to do:
# echo 1 > tracing_on

You might also want to set current_tracer to something.

Otherwise I don't know what the problem can be.

-- =

David Henningsson, Canonical Ltd.
https://launchpad.net/~diwic