Public bug reported:
From: Daniel Chen <>
To: ubuntu-devel-discuss <[email protected]>,
Ubuntu Devel <[email protected]>
Subject: Recent changes to ALSA for power saving
Date: Tue, 26 May 2009 23:18:17 +0200
Hi all,
Luke and I have just pushed a one-line change to 9.10's
/etc/modprobe.d/alsa-base.conf that enables HDA controllers to power
down their amps after ten idle seconds. This change anticipates the
larger power-savings objectives for 9.10.
We expect there will be regressions in the form of audible pops when
the AMPs power down (and/or up). If you experience this symptom in
9.10, please file a bug using "ubuntu-bug alsa-base". Be sure to
change the summary of the bug afterward to "[9.10 regression] HDA
power_save=10".
Thanks,
Dan
reported bus as suggested by this post on the mailing lists.
started rhythmbox, pushed "pause" and after ten seconds amps gives
noise.
Also:
Prior to this change, during shutdown, amps gives noise when they power down.
ProblemType: Bug
Architecture: amd64
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: SB [HDA ATI SB], device 0: STAC92xx Analog [STAC92xx Analog]
Subdevices: 2/2
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: taavikko 4248 f.... mixer_applet2
Card0.Amixer.info:
Card hw:0 'SB'/'HDA ATI SB at 0xd2400000 irq 16'
Mixer name : 'IDT 92HD71B7X'
Components : 'HDA:111d76b2,103c3600,00100302'
Controls : 33
Simple ctrls : 20
Card1.Amixer.info:
Card hw:1 'HDMI'/'HDA ATI HDMI at 0xd2310000 irq 19'
Mixer name : 'ATI R6xx HDMI'
Components : 'HDA:1002aa01,00aa0100,00100000'
Controls : 4
Simple ctrls : 1
Card1.Amixer.values:
Simple mixer control 'IEC958',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Date: Wed May 27 13:03:18 2009
DistroRelease: Ubuntu 9.10
Package: alsa-base 1.0.20+dfsg-1ubuntu4
PackageArchitecture: all
ProcEnviron:
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.30-6.7-generic
SourcePackage: alsa-driver
Uname: Linux 2.6.30-6-generic x86_64
** Affects: alsa-driver (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug
--
[9.10 regression] HDA power_save=10"
https://bugs.launchpad.net/bugs/380892
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