http://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/tree/Documentation/sound/alsa /HD-Audio.txt
check the response of hda unsol event when headphone is plugged and unplugged Tracepoints ~~~~~~~~~~~ The hd-audio driver gives a few basic tracepoints. `hda:hda_send_cmd` traces each CORB write while `hda:hda_get_response` traces the response from RIRB (only when read from the codec driver). `hda:hda_bus_reset` traces the bus-reset due to fatal error, etc, `hda:hda_unsol_event` traces the unsolicited events, and `hda:hda_power_down` and `hda:hda_power_up` trace the power down/up via power-saving behavior. Enabling all tracepoints can be done like ------------------------------------------------------------------------ # echo 1 > /sys/kernel/debug/tracing/events/hda/enable ------------------------------------------------------------------------ then after some commands, you can traces from /sys/kernel/debug/tracing/trace file. For example, when you want to trace what codec command is sent, enable the tracepoint like: ------------------------------------------------------------------------ # cat /sys/kernel/debug/tracing/trace # tracer: nop -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1067434 Title: Sound output device keeps changing when using headphones To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1067434/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
