Confirmed: High-frequency whistle (sounds like exceeding Nyquist
frequency) with ALC882+pulseaudio when playing any audio in 5.1 analog
output.
Fix works:
; default-sample-format = s16le
default-sample-format = s24le
$ pulseaudio -k
Then, whistles gone.
Sound driver: hda_snd_intel.
On-board sound: Asus P5W DH Deluxe with (ALC882) audio
Kernel: Linux somer 2.6.31-17-generic #54-Ubuntu SMP Thu Dec 10 17:01:44 UTC
2009 x86_64 GNU/Linux
$ lspci -vnn
00:1b.0 Audio device [0403]: Intel Corporation 82801G (ICH7 Family) High
Definition Audio Controller [8086:27d8] (rev 01)
Subsystem: ASUSTeK Computer Inc. Device [1043:81d8]
Flags: bus master, fast devsel, latency 0, IRQ 19
Memory at febfc000 (64-bit, non-prefetchable) [size=16K]
Capabilities: [50] Power Management version 2
Capabilities: [60] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0
Enable-
Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
Capabilities: [100] Virtual Channel <?>
Capabilities: [130] Root Complex Link <?>
Kernel driver in use: HDA Intel
Kernel modules: snd-hda-intel
Two notable things also occured that might be useful in diagnosing:
1. Was getting a bunch of rate limit messages before default-sample-
format changed to s24le. Afterward, the rate-limit messages were
reduced considerably even after I went back to s16le. You can see that
in messages log. Comments in square brackets.
Dec 16 23:07:19 somer pulseaudio[2260]: ratelimit.c: 177 events suppressed
Dec 16 23:18:07 somer pulseaudio[2260]: ratelimit.c: 180 events suppressed
Dec 16 23:20:58 somer pulseaudio[2260]: ratelimit.c: 179 events suppressed
Dec 17 00:02:41 somer pulseaudio[2260]: ratelimit.c: 176 events suppressed
Dec 17 00:20:10 somer pulseaudio[2260]: ratelimit.c: 172 events suppressed
Dec 17 00:20:41 somer pulseaudio[2260]: ratelimit.c: 43 events suppressed
[daemon.conf changed and PA killed]
Dec 17 00:22:04 somer pulseaudio[21491]: alsa-mixer.c: Your kernel driver is
broken: it reports a volume range from 18.00 dB to 18.00 dB which makes no
sense.
Dec 17 00:23:33 somer pulseaudio[21491]: last message repeated 6 times
Dec 17 00:25:09 somer pulseaudio[21491]: ratelimit.c: 5 events suppressed
Dec 17 00:27:49 somer pulseaudio[21491]: ratelimit.c: 2 events suppressed
[continues with approx. 1 - 10 events per report]
2. Everytime PA is killed this appears in messages and syslog:
Dec 17 00:34:00 somer pulseaudio[22677]: alsa-mixer.c: Your kernel driver is
broken: it reports a volume range from 18.00 dB to 18.00 dB which makes no
sense.
3. Twice received this message in syslog:
Dec 17 00:25:03 sophia pulseaudio[21491]: alsa-sink.c: ALSA woke us up to write
new data to the device, but there was actually nothing to write!
Dec 17 00:25:03 sophia pulseaudio[21491]: alsa-sink.c: Most likely this is a
bug in the ALSA driver 'snd_hda_intel'. Please report this issue to the ALSA
developers.
Dec 17 00:25:03 sophia pulseaudio[21491]: alsa-sink.c: We were woken up with
POLLOUT set -- however a subsequent snd_pcm_avail() returned 0 or another value
< min_avail.
** Changed in: pulseaudio (Ubuntu)
Status: New => Confirmed
--
after upgrade to karmic during audio playback a high-frequency whistling can be
heard
https://bugs.launchpad.net/bugs/475997
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