Bug#430017: kernel: Recording silence, chipset: Cirrus Logic CS 4614/22/24 [CrystalClear SoundFusion Audio Accelerator]
Package: kernel
Version: Linux 2.6.18-4-686 #1 SMP Wed May 9 23:03:12 UTC 2007 i686 GNU/Linux
Severity: normal
As reported in this post, and its various follow-ups:
http://lists.debian.org/debian-user/2007/06/msg01762.html
Microphone is set as the capture device, but when recording with
audacity, arecord, or the gnome sound recorder only silence is
recorded.
Same behaviour on two different machines, which coincidently have the
same chipset. I'm assuming that is relevant hence this bug report is
against kernel package.
Dell Precision 420 desktop:-
02:06.0 Multimedia audio controller: Cirrus Logic CS 4614/22/24 [CrystalClear SoundFusion Audio Accelerator] (rev 01)
Subsystem: Dell Unknown device 0096
Flags: bus master, medium devsel, latency 64, IRQ 193
Memory at fcffe000 (32-bit, non-prefetchable) [size=4K]
Memory at fce00000 (32-bit, non-prefetchable) [size=1M]
Capabilities: [40] Power Management version 2
IBM Thinkpad T21 laptop:-
00:05.0 Multimedia audio controller: Cirrus Logic CS 4614/22/24 [CrystalClear SoundFusion Audio Accelerator] (rev 01)
Subsystem: IBM ThinkPad A20m
Flags: bus master, slow devsel, latency 64, IRQ 11
Memory at e8122000 (32-bit, non-prefetchable) [size=4K]
Memory at e8000000 (32-bit, non-prefetchable) [size=1M]
Capabilities: [40] Power Management version 2
It must be said that I have not yet had microphone working in
GNU/Linux, the above being the only two Debian machines available to
me. However, I'm pretty certain it's set up correctly:
In the Gnome volume control:
Playback tab - Microphone slider is set to 100, and not muted
Capture tab - Both sliders set to 100 and not muted
Switches tab - Microphone Capture is ticked
Options tab - Mic Select set to Mic1, Mono select set to Mic
Alternatively, using alsamixer:
In 'Capture view', above Mic is written CAPTUR, also above Capture is
written CAPTUR and the Capture slider is set to 100<>100.
In 'Playback view' the Mic slider is set to 100, and not muted [00].
With these setting, the mic sounds are heard through the PC speakers
but Audacity (or any other app) records only silence.
More details here -
http://lists.debian.org/debian-user/2007/06/msg01762.html
-- System Information:
Debian Release: 4.0
APT prefers stable
APT policy: (500, 'stable')
Architecture: i386 (i686)
Shell: /bin/sh linked to /bin/bash
Kernel: Linux 2.6.18-4-686
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
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