any reason to use loopback when you have line playback volume ?
try turn on line playback switch and change line playback volume to 0 dB
Simple mixer control 'Line',0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 28 [90%] [7.50dB] [off]
Front Right: Playback 28 [90%] [7.50dB] [off]
Simple mixer control 'Line Boost',0
Capabilities: volume
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: 0 - 3
Front Left: 0 [0%] [0.00dB]
Front Right: 0 [0%] [0.00dB]
** Changed in: alsa-driver (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1323039
Title:
[To be filled by O.E.M., Realtek ALC898, Blue Line In, Rear]
Background noise or low volume
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