> On Sat, 2013-02-23 at 20:42 +0100, Adrian Lang wrote: > > Package: src:linux > > Version: 3.2.35-2 > > Severity: normal > > > > There are two microphones in alsamixer and Gnome 3 audio settings (i. e., > > pulseaudio), but I can't get any sound using either of them. I think that's the > > same problem as reported to [openSUSE] and [Ubuntu]. > > > > The problem persists with 3.7 (3.7.8-1~experimental.1) from > > experimental. > > > > [openSUSE] > > http://forums.opensuse.org/english/get-technical-help-here/laptop/469210-opensuse-12-1-cannot-get-internal-mic-work-lenovo-g770-laptop.html > > [Ubuntu] > > https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/938644 > > I happen to have a Thinkpad T420 with the same audio codec, and the > internal mic works fine. (There does seem to be a problem with external > mics, now that I check, but let's ignore that for now.) So this is more > board-specific, not chip-specific, behaviour. > > [...] > > ** Model information > > sys_vendor: LENOVO > > product_name: 4171CTO > > product_version: ThinkPad T420s > [...] > > Does the T420s also have a single socket that can be used with either > headphones or headset?
Seem related to http://git.kernel.org/?p=linux/kernel/git/tiwai/sound.git;a=commit;h=6b45214277bec2193ad3ccb8d7aa6100b5a0f1a9 Node 0x14 [Audio Input] wcaps 0x100d1b: Stereo Amp-In R/L Control: name="Mic Capture Volume", index=0, device=0 ControlAmp: chs=3, dir=In, idx=0, ofs=0 Control: name="Mic Capture Switch", index=0, device=0 ControlAmp: chs=3, dir=In, idx=0, ofs=0 Control: name="Internal Mic Capture Volume", index=0, device=0 ControlAmp: chs=3, dir=In, idx=2, ofs=0 Control: name="Internal Mic Capture Switch", index=0, device=0 ControlAmp: chs=3, dir=In, idx=2, ofs=0 Device: name="CONEXANT Analog", type="Audio", device=0 Amp-In caps: ofs=0x4a, nsteps=0x50, stepsize=0x03, mute=1 Amp-In vals: [0x80 0x80] [0x4a 0x4a] [0x50 0x50] [0x4a 0x4a] Converter: stream=0, channel=0 SDI-Select: 0 PCM: rates [0x160]: 44100 48000 96000 bits [0xe]: 16 20 24 formats [0x1]: PCM Power states: D0 D1 D2 D3 D3cold EPSS Power: setting=D0, actual=D0 Connection: 4 0x17 0x18 0x23* 0x24
