Same problem here, didn't test powering with headphones either.
Laptop is Acer Aspire 3820TG, used to work in older ubuntus.
kernel: 3.0.0-12-generic-pae
lspci -v:
02:00.1 Audio device: ATI Technologies Inc Redwood HDMI Audio [Radeon HD 5600
Series]
Subsystem: Acer Incorporated [ALI] Device 0364
Flags: bus master, fast devsel, latency 0, IRQ 43
Memory at cfedc000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: 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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