Same problem here. Did not, however tested what's happening when powering on 
with headphones attached.
Ubuntu 12.04 64bit. No Problem in 10.04 10.10. 

lspci -v:
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio 
Controller (rev 03)
        Subsystem: Acer Incorporated [ALI] Device 015e
        Flags: bus master, fast devsel, latency 0, IRQ 46
        Memory at f0400000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: [50] Power Management version 2
        Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
        Capabilities: [100] Virtual Channel
        Capabilities: [130] Root Complex Link
        Kernel driver in use: snd_hda_intel
        Kernel modules: snd-hda-intel
Please fix, this is a no-go.

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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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