Exactly the same problem here. Behavior is determined in boot time:
-if headphones plugged in at boot, sound only in headphones until next reboot.
-if headphones not plugged in at boot, sound in both speakers and headphones
until next boot.
In 11.10 the behavior was correct, speakers would turn off as soon as
headphones were plugged in.
My computer is an Acer Aspire 5920 laptop
lspci -v:
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio
Controller (rev 03)
Subsystem: Acer Incorporated [ALI] Aspire 5920G
Flags: bus master, fast devsel, latency 0, IRQ 45
Memory at f3500000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: snd_hda_intel
Kernel modules: snd-hda-intel
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https://bugs.launchpad.net/bugs/995684
Title:
Switching problem between headphone speaker and microphone to laptop
built in speakers and front mic
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