I have a netbook with Debian sid, command line only, using it for a server. I am trying to configure it so that the speakers play back what is going in through the netbook's line in audio port. I can not find a simple way to do that.As far as I know, I am using ALSA for all audio, no jack and no pulse audio.I use alsamixer to manage audio levels, but I can not find a 'capture' mode in the PLAYBACK settings to turn on.Card: HDA IntelChip: Realtek ID 268Note: All other audio seems to work. Line in does record (although just can't figure out how to route it live to speakers) and speakers do work themselves. Tested by doing arecord then aplay.Here is my 'aplay -L' output:null    Discard all samples (playback) or generate zero samples (capture)default:CARD=Intel    HDA Intel, ID 268 Analog    Default Audio Devicesysdefault:CARD=Intel    HDA Intel, ID 268 Analog    Default Audio Devicefront:CARD=Intel,DEV=0    HDA Intel, ID 268 Analog    Front speakerssurround40:CARD=Intel,DEV=0    HDA Intel, ID 268 Analog    4.0 Surround output to Front and Rear speakerssurround41:CARD=Intel,DEV=0    HDA Intel, ID 268 Analog    4.1 Surround output to Front, Rear and Subwoofer speakerssurround50:CARD=Intel,DEV=0    HDA Intel, ID 268 Analog    5.0 Surround output to Front, Center and Rear speakerssurround51:CARD=Intel,DEV=0    HDA Intel, ID 268 Analog    5.1 Surround output to Front, Center, Rear and Subwoofer speakerssurround71:CARD=Intel,DEV=0    HDA Intel, ID 268 Analog    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
Trying to hear audio coming from LINE IN using ALSA on Debian
alsa