Plugging in and out headphones seems to override alsamixer settings. When muting front in alsamixer (effect: internal speaker muted) and plugging in and out headphones/external speakers internal speakers unmute regardless of muting front in alsamixer settings. this unmute does not show in alsamixer, which displays front being muted. restarting alsamixer does not change this. time of muting front (first plugging in headphones/external speakers then muting front) does not affect specified behaviour. Conversely plugging in headphones/external speaker automatically mutes internal speakers regardless of alsamixer settings. Problem only appears with unmuted 'headphon' when plugging in/out headphones/external speakers and regardless of alsasound service running. some config details i think relevant: amd64 2008 no-multilib profile gentoo-sources-2.6.25-r7 (pure alsa, without deprecated modules and oss support, built into kernel) alsa-utils 1.0.16 alsa configuration is still as per emerge switched to amd64 profile just yesterday. my box: samsung r70 aura deluis notebook ... intel ich8 family hd audio controller, in kernel config: Intel HD Audio bug may or may not be a desired feature by some people (see many posts etc regarding headphone jack sense not working et al.) but if so it should be togglable. i ask forgiveness for not having found a solution myself or via extensive searching means. Reproducible: Always Steps to Reproduce: 1. alsamixer 2. mute front 3. plug in headphones/external speakers 4. plug off headphones/external speakers 1. alsamixer 2. unmute front and 'headphon' 3. plugin headphone/external speakers Actual Results: internal speakers playing sound internal speakers don't play sound Expected Results: internal speakers stay muted internal speakers still playing using alsamixer to unmute then mute resp. mute then unmute 'front' puts internal speakers to desired state. i used to have a x86 build on my system before, which did not feature this behaviour so the bug may or not be 2.6.25 related. for the 32 bit profile i used tuxonice-sources 2.6.24-r9, basically same kernel config but for tuxonice, same alsa revisions and config.
my comment on bug not being present in old build may or may not be true. if and oly if i recall correctly internal speakers never unmuted/muted unless being muted/unmuted via alsamixer. i never did test specified scenarios with old system.
works for me with 2.6.27-r4, but might be completely unrelated
