2012-10-21 下午6:12 於 "Takashi Iwai" tiwai@suse.de 寫道：
At Sun, 21 Oct 2012 17:51:00 +0800, Raymond Yau wrote:
[1 <text/plain; UTF-8 (quoted-printable)>] 2012-10-21 下午4:42 於 "Takashi Iwai" tiwai@suse.de 寫道：
At Fri, 19 Oct 2012 11:15:29 +0800, Raymond Yau wrote:
does softvol plugin "master" has any preference over vmaster in
amixer ?
No, it shouldn't.
Simple mixer control 'Master',0 Capabilities: pvolume pswitch pswitch-joined penum Playback channels: Front Left - Front Right Limits: Playback 0 - 255 Mono: Front Left: Playback 255 [100%] [191.00dB] [on] Front Right: Playback 255 [100%] [191.00dB] [on]
the dB value change to 191dB
it seem that alsa-lib is unable to find the correct tlv
Something wild is merged in his system. It has a wrong "Master" control without suffix. Also a strange "Pre-Amp" control is found there, too. The string doesn't fix in kernel or alsa-lib codes at all.
the softvol plugin allow user to define the name of the control and dB range
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1066814
the user has a fresh install of kbuntu 12.04 and found the volume too low for his alc887vd as he mention that he tried some asound.rc config
Oct 15 11:55:24 xaser pulseaudio[1606]: ( 0.111| 0.006) [alsa-sink] alsa-sink.c: Requested volume: 0: 21450% 1: 21450% Oct 15 11:55:24 xaser pulseaudio[1606]: ( 0.111| 0.000) [alsa-sink] alsa-sink.c: in dB: 0: 191.00 dB 1: 191.00 dB Oct 15 11:55:24 xaser pulseaudio[1606]: ( 0.111| 0.000) [alsa-sink] alsa-sink.c: Got hardware volume: 0: 100% 1: 100% Oct 15 11:55:24 xaser pulseaudio[1606]: ( 0.111| 0.000) [alsa-sink] alsa-sink.c: in dB: 0: 0.02 dB 1: 0.02 dB Oct 15 11:55:24 xaser pulseaudio[1606]: ( 0.111| 0.000) [alsa-sink] alsa-sink.c: Calculated software volume: 0: 21336% 1: 21336% (accurate-enough=no) Oct 15 11:55:24 xaser pulseaudio[1606]: ( 0.111| 0.000) [alsa-sink] alsa-sink.c: in dB: 0: 190.98 dB 1: 190.98 dB
did pulseaudio limited the sofware volume to some reasonable value or warned about the extra ordinary large dB of the hardware volume
http://www.alsa-project.org/db/?f=44b26f5cd37f33bfef2871ff1fd250301bdb5364
control.32 { iface MIXER name 'Master Playback Volume' value 64 comment { access 'read write' type INTEGER count 1 range '0 - 64' dbmin -6400 dbmax 0 dbvalue.0 0 } }
control.42 { iface MIXER name Master value.0 255 value.1 255 comment { access 'read write user' type INTEGER count 2 range '0 - 255' tlv '0000000100000008ffffec1400000014' dbmin -5100 dbmax 0 dbvalue.0 0 dbvalue.1 0 }
Card hw:0 'Intel'/'HDA Intel at 0xfeaf8000 irq 43' Mixer name: 'Realtek ALC887-VD' Components: 'HDA:10ec0887,10438445,00100302' Controls : 42 Simple ctrls : 22 Simple mixer control 'Master',0 Capabilities: pvolume pswitch pswitch-joined penum Playback channels: Front Left - Front Right Limits: Playback 0 - 255 Mono: Front Left: Playback 255 [100%] [191.00dB] [on] Front Right: Playback 255 [100%] [191.00dB] [on]