[alsa-devel] How to show hda trace events in a self-built kernel?
david.henningsson at canonical.com
Wed Apr 23 10:31:39 CEST 2014
On 2014-04-23 09:35, Lin, Mengdong wrote:
> 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 “cat trace”. 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.
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