[Bug 275998] Re: audio recording very silent

[jixuanliu]

amixer -Dhw on my machine gives:


Simple mixer control 'Master',0           
  Capabilities: pvolume pvolume-joined pswitch pswitch-joined
  Playback channels: Mono                                    
  Limits: Playback 0 - 31                                    
  Mono: Playback 31 [100%] [0.00dB] [on]                     
Simple mixer control 'Headphone',0                           
  Capabilities: pswitch                                      
  Playback channels: Front Left - Front Right                
  Mono:                                                      
  Front Left: Playback [on]                                  
  Front Right: Playback [on]                                 
Simple mixer control 'PCM',0                                 
  Capabilities: pvolume                                      
  Playback channels: Front Left - Front Right                
  Limits: Playback 0 - 255                                   
  Mono:                                                      
  Front Left: Playback 255 [100%] [0.00dB]                   
  Front Right: Playback 255 [100%] [0.00dB]                  
Simple mixer control 'Front',0                               
  Capabilities: pvolume pswitch                              
  Playback channels: Front Left - Front Right                
  Limits: Playback 0 - 31                                    
  Mono:                                                      
  Front Left: Playback 28 [90%] [-4.50dB] [on]               
  Front Right: Playback 28 [90%] [-4.50dB] [on]              
Simple mixer control 'Front Mic',0                           
  Capabilities: pvolume pswitch                              
  Playback channels: Front Left - Front Right                
  Limits: Playback 0 - 31                                    
  Mono:                                                      
  Front Left: Playback 23 [74%] [0.00dB] [on]                
  Front Right: Playback 23 [74%] [0.00dB] [on]               
Simple mixer control 'Front Mic Boost',0                     
  Capabilities: volume                                       
  Playback channels: Front Left - Front Right                
  Capture channels: Front Left - Front Right                 
  Limits: 0 - 3                                              
  Front Left: 0 [0%]                                         
  Front Right: 0 [0%]                                        
Simple mixer control 'Surround',0                            
  Capabilities: pvolume pswitch                              
  Playback channels: Front Left - Front Right                
  Limits: Playback 0 - 31                                    
  Mono:                                                      
  Front Left: Playback 25 [81%] [-9.00dB] [on]               
  Front Right: Playback 25 [81%] [-9.00dB] [on]              
Simple mixer control 'Center',0                              
  Capabilities: pvolume pvolume-joined pswitch pswitch-joined
  Playback channels: Mono                                    
  Limits: Playback 0 - 31                                    
  Mono: Playback 25 [81%] [-9.00dB] [on]                     
Simple mixer control 'LFE',0                                 
  Capabilities: pvolume pvolume-joined pswitch pswitch-joined
  Playback channels: Mono                                    
  Limits: Playback 0 - 31                                    
  Mono: Playback 23 [74%] [-12.00dB] [on]                    
Simple mixer control 'Side',0                                
  Capabilities: pvolume pswitch                              
  Playback channels: Front Left - Front Right                
  Limits: Playback 0 - 31                                    
  Mono:                                                      
  Front Left: Playback 0 [0%] [-46.50dB] [off]               
  Front Right: Playback 0 [0%] [-46.50dB] [off]              
Simple mixer control 'Line',0                                
  Capabilities: pvolume pswitch                              
  Playback channels: Front Left - Front Right                
  Limits: Playback 0 - 31                                    
  Mono:                                                      
  Front Left: Playback 0 [0%] [-34.50dB] [off]               
  Front Right: Playback 0 [0%] [-34.50dB] [off]              
Simple mixer control 'CD',0                                  
  Capabilities: pvolume pswitch                              
  Playback channels: Front Left - Front Right                
  Limits: Playback 0 - 31                                    
  Mono:                                                      
  Front Left: Playback 25 [81%] [3.00dB] [on]                
  Front Right: Playback 25 [81%] [3.00dB] [on]               
Simple mixer control 'Mic',0                                 
  Capabilities: pvolume pswitch                              
  Playback channels: Front Left - Front Right                
  Limits: Playback 0 - 31                                    
  Mono:                                                      
  Front Left: Playback 25 [81%] [3.00dB] [on]                
  Front Right: Playback 25 [81%] [3.00dB] [on]               
Simple mixer control 'Mic Boost',0                           
  Capabilities: volume                                       
  Playback channels: Front Left - Front Right                
  Capture channels: Front Left - Front Right                 
  Limits: 0 - 3                                              
  Front Left: 0 [0%]                                         
  Front Right: 0 [0%]                                        
Simple mixer control 'IEC958',0                              
  Capabilities: pswitch pswitch-joined cswitch cswitch-joined
  Playback channels: Mono                                    
  Capture channels: Mono                                     
  Mono: Playback [off] Capture [off]                         
Simple mixer control 'IEC958 Default PCM',0                  
  Capabilities: pswitch pswitch-joined                       
  Playback channels: Mono                                    
  Mono: Playback [on]                                        
Simple mixer control 'PC Speaker',0                          
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 31
  Mono:
  Front Left: Playback 0 [0%] [-34.50dB] [off]
  Front Right: Playback 0 [0%] [-34.50dB] [off]
Simple mixer control 'Capture',0
  Capabilities: cvolume cswitch
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 31
  Front Left: Capture 9 [29%] [1.50dB] [off]
  Front Right: Capture 9 [29%] [1.50dB] [off]
Simple mixer control 'Capture',1
  Capabilities: cvolume cswitch
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 31
  Front Left: Capture 0 [0%] [-12.00dB] [off]
  Front Right: Capture 0 [0%] [-12.00dB] [off]
Simple mixer control 'Channel Mode',0
  Capabilities: enum
  Items: '6ch' '8ch'
  Item0: '6ch'
Simple mixer control 'Digital',0
  Capabilities: cvolume
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 120
  Front Left: Capture 106 [88%] [23.00dB]
  Front Right: Capture 106 [88%] [23.00dB]
Simple mixer control 'Input Source',0
  Capabilities: cenum
  Items: 'Mic' 'Front Mic' 'Line' 'CD'
  Item0: 'Mic'
Simple mixer control 'Input Source',1
  Capabilities: cenum
  Items: 'Mic' 'Front Mic' 'Line' 'CD'
  Item0: 'Front Mic'

-- 
audio recording very silent
https://bugs.launchpad.net/bugs/275998
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