Thanks for the info. (FYI, I have a Windtop 2200 All-in-one touchscreen, on which I'm building an appliance with, among other things, VOIP phone and answering machine capability). I want the user to be able to "put the call on speaker" even if the mic/headphone handset is plugged in.

Can amixer override this automuting. Is it that the driver just sets the speakers to mute *at the time* the headphone is plugged in, or does it force them mute *so long as* the headphone is plugged in?

Or, regarding the pin_configs possibility, I guess I somehow edit /sys/devices/pci0000:00/0000:00:08.0/sound/card0/hwC0D0/init_pin_configs (or maybe user_pin_configs?). Could one point me to documentation on what the bits mean? Mine are: 0x11 0x411111f0 0x12 0x411111f0 0x14 0x01014010 0x15 0x411111f0 0x16 0x99130120 0x17 0x411111f0 0x18 0x01a19850 0x19 0x99a3095f 0x1a 0x411111f0 0x1b 0x99130130 0x1c 0x411111f0 0x1d 0x4004022b 0x1e 0x01451140 0x1f 0x411111f0

Regards -Eric

David Henningsson wrote:

2010-08-27 20:46, Eric Holstege skrev:

...

Thanks, Clemens;

How were you able to determine that from the "amixer scontents" output.

Although I can't disable *automatic* speaker mute on headphone insertion, can I explicitly unmute them again (e.g. with amixer sset or cset)?

If not.... "cat /proc/asound/card*/codec*" says it is the Realtek ALC888. Does this mean I have to somehow patch the kernel sound module file .../linux-source-2.6.*/sound/pci/hda/patch_realtek.c to fix this somehow?

So in the long run, I think it would be better to leave all auto-muting to userspace. Then stuff like pulseaudio could to advanced decision of how to handle input events. But that's the long way.

There are certainly ways to disable auto-muting for Realtek ALC888, look along the lines of "speaker_automute" and "unsol_event". It is also possible that you could tweak your user_pin_config to trick your HP out into a Line Out. That way it won't automute, and you don't have to recompile your kernel.

As a side note: The VIA HDA driver, I believe, have an option for turning automute off. But it also sets "mute" on a misnamed control at the same time, tricking PA into believing that you want to mute all output. So PA is "helpful" and mutes everything else as well. :-/