At Thu, 19 Feb 2015 15:24:15 +0900, Michel D4nzer wrote:
Hi,
the built-in speakers of my HP ProBook 455 G2 are not working by default. I'm attaching the output of alsa-info.sh.
Is this a regression from earlier kernels?
In pavucontrol, the speakers appear as "Speakers (unavailable)", and in the GNOME sound settings they don't appear at all.
After some playing around with HDAAnalyzer, I discovered that enabling the 'OUT' widget control of pin 0x14 makes the speakers emit sound, see the diff below.
Interesting. This behavior doesn't appear on the emulator, so something else must have cleared the pin ctl.
To be sure, load snd-hda-intel module with probe_only=1,1 option. You can check /proc/asound/card1/codec#0 to see which value is set to the pin 0x14 by BIOS as default. Then, enable the tracing via # echo 1 > /sys/kernel/debug/tracing/events/hda/enable
and configure the codec via # echo 1 > /sys/class/sound/hwC1D0/reconfigure
This will set up the PCM and the mixer. Get the events from /sys/kernel/debug/tracing/trace. At this point. Then check again whether pin 0x14 is set or not.
Better to check the above without PulseAudio, i.e. do it in runlevel 3 on Linux console.
Once when the problem is confirmed (the pin control is still 0x00), try to check the events log you got. The bits 28-32 of the event value indicates the codec address, the bits 20-28 the widget nid, and the rest 20 bits the combo of verb + parameter. So, the command SET_PIN_WIDGET_CONTROL for the widget 0x14 should appear like 0x01470740 where 0x707 is SET_PIN_WIDGET_CONTROL verb and 0x40 is the pin control value.
thanks,
Takashi