On Saturday 25 December 2010 19:26:44 you wrote: > It looks like the symptom that you describe is likely a sound driver > issue.
Depending on what you call a driver, I agree. The point is that plain ALSA output without pulseaudio works, so that part of the driver stack is not the problem. However, adding pulseaudio as intermediate driver layer causes problems. > Are you still able to reproduce it in current testing? I'm not experiencing the jumps in the output level, though I haven't tested it extensively. The output sliders twitch when starting, but neither is the effect permanent nor audible. However, I also mentioned that the problem was not 100% reproducible even at that time (see point 5). Considering point one, there's still a similar effect in place. If I run alsamixergui in parallel, changing the PCM volume there affects both the sliders for Amarok on the "Playback" tab and those on the "Output Devices" tab of pavucontrol. Using pavucontrol, I can change both pairs of sliders separately though. The behaviour of alsamixergui is to follow changes on both to some extent. Considering point 6, this effect is still present. However, the absolute limite of 43% percent actually depends on the the settings of both the sliders on the "Playback" and "Output Devices" tabs of pavucontrol. In any case, the static begins when turning the PCM output to close to zero on alsamixergui or when it reaches this level through the combined pavucontrol slider levels. That and the occasional cracks and plops made stop using pulseaudio, so I can't really say whether the main part of the bug report is still applicable with current versions. > https://wiki.ubuntu.com/Audio/AlsaInfo See attachment, hope that helps! Cheers and thanks! Uli
upload=true&script=true&cardinfo= !!################################ !!ALSA Information Script v 0.4.59 !!################################ !!Script ran on: Sun Dec 26 11:03:13 UTC 2010 !!Linux Distribution !!------------------ Debian GNU/Linux squeeze/sid \n \l !!DMI Information !!--------------- Manufacturer: Product Name: !!Kernel Information !!------------------ Kernel release: 2.6.37-rc5-powerpc Operating System: GNU/Linux Architecture: ppc Processor: unknown SMP Enabled: No !!ALSA Version !!------------ Driver version: 1.0.23 Library version: 1.0.23 Utilities version: 1.0.23 !!Loaded ALSA modules !!------------------- snd_aoa_fabric_layout !!Sound Servers on this system !!---------------------------- Pulseaudio: Installed - Yes (/usr/bin/pulseaudio) Running - Yes ESound Daemon: Installed - Yes (/usr/bin/esd) Running - No aRts: Installed - Yes (/usr/bin/artsd) Running - No !!Soundcards recognised by ALSA !!----------------------------- 0 [SoundByLayout ]: AppleOnbdAudio - SoundByLayout SoundByLayout !!PCI Soundcards installed in the system !!-------------------------------------- !!Advanced information - PCI Vendor/Device/Susbsystem ID's !!-------------------------------------------------------- !!Modprobe options (Sound related) !!-------------------------------- snd-atiixp-modem: index=-2 snd-intel8x0m: index=-2 snd-via82xx-modem: index=-2 snd-pcsp: index=-2 snd-usb-audio: index=-2 snd-powermac: index=0 !!Loaded sound module options !!-------------------------- !!Module: snd_aoa_fabric_layout * : !!ALSA Device nodes !!----------------- crw-rw----+ 1 root audio 116, 4 Dec 24 18:58 /dev/snd/controlC0 crw-rw----+ 1 root audio 116, 6 Dec 24 18:58 /dev/snd/pcmC0D0c crw-rw----+ 1 root audio 116, 5 Dec 26 11:21 /dev/snd/pcmC0D0p crw-rw----+ 1 root audio 116, 3 Dec 24 18:58 /dev/snd/seq crw-rw----+ 1 root audio 116, 2 Dec 24 18:58 /dev/snd/timer /dev/snd/by-path: total 0 drwxr-xr-x 2 root root 60 Dec 24 18:58 . drwxr-xr-x 3 root root 160 Dec 24 18:58 .. lrwxrwxrwx 1 root root 12 Dec 24 18:58 pci-0001:10:17.0 -> ../controlC0 !!Aplay/Arecord output !!------------ APLAY **** List of PLAYBACK Hardware Devices **** card 0: SoundByLayout [SoundByLayout], device 0: Master [] Subdevices: 0/1 Subdevice #0: subdevice #0 ARECORD **** List of CAPTURE Hardware Devices **** card 0: SoundByLayout [SoundByLayout], device 0: Master [] Subdevices: 1/1 Subdevice #0: subdevice #0 !!Amixer output !!------------- !!-------Mixer controls for card 0 [SoundByLayout] Card hw:0 'SoundByLayout'/'SoundByLayout' Mixer name : 'SoundByLayout' Components : '' Controls : 5 Simple ctrls : 5 Simple mixer control 'Headphone',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] Simple mixer control 'Headphone Detect Autoswitch',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] Simple mixer control 'Headphone Detected',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] Simple mixer control 'Speakers',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [off] Simple mixer control 'PCM',0 Capabilities: pvolume penum Playback channels: Front Left - Front Right Limits: Playback 0 - 255 Mono: Front Left: Playback 211 [83%] [-8.80dB] Front Right: Playback 211 [83%] [-8.80dB] !!Alsactl output !!------------- --startcollapse-- state.SoundByLayout { control.1 { comment.access 'read write' comment.type BOOLEAN comment.count 1 iface MIXER name 'Speakers Switch' value false } control.2 { comment.access 'read write' comment.type BOOLEAN comment.count 1 iface MIXER name 'Headphone Switch' value true } control.3 { comment.access 'read write' comment.type BOOLEAN comment.count 1 iface MIXER name 'Headphone Detect Autoswitch' value true } control.4 { comment.access read comment.type BOOLEAN comment.count 1 iface MIXER name 'Headphone Detected' value true } control.5 { comment.access 'read write user' comment.type INTEGER comment.count 2 comment.range '0 - 255' comment.tlv '0000000100000008ffffec1400000014' comment.dbmin -5100 comment.dbmax 0 iface MIXER name 'PCM Playback Volume' value.0 211 value.1 211 } } --endcollapse-- !!All Loaded Modules !!------------------ Module sha256_generic aes_generic cbc radeon ttm drm_kms_helper drm power_supply parport_pc lp parport sco bridge stp bnep rfcomm l2cap crc16 fuse firewire_sbp2 loop dm_crypt dm_mod snd_aoa_codec_toonie arc4 sd_mod crc_t10dif snd_aoa_fabric_layout ecb snd_aoa snd_aoa_i2sbus snd_pcm_oss snd_mixer_oss snd_pcm b43 snd_page_alloc snd_seq_midi snd_rawmidi rng_core mac80211 btusb snd_seq_midi_event bluetooth uas snd_seq joydev cfg80211 usb_storage scsi_mod usbhid snd_timer snd_seq_device hid i2c_powermac snd evdev soundcore rfkill snd_aoa_soundbus ext3 jbd mbcache ohci_hcd ehci_hcd ssb mmc_core usbcore firewire_ohci ide_cd_mod pcmcia sungem firewire_core cdrom pcmcia_core sungem_phy crc_itu_t nls_base !!ALSA/HDA dmesg !!------------------