My laptop is a Sony Vaio PCG-FREV37. I don't know how it's wired on the inside; there appear to be three external connections (from the symbols, I think they're a line-out, a mic-in, and headphone/speaker-out; I've only tried the headphone jack). There's also a built-in speaker that normally is active when external speakers aren't plugged in. "amixer scontents" says: --------- cut here ---------- Simple mixer control 'Master',0 Capabilities: pvolume pswitch Playback channels: Front Left - Front Right Limits: Playback 0 - 31 Front Left: Playback 28 [90%] [on] Front Right: Playback 28 [90%] [on] Simple mixer control 'Master Mono',0 Capabilities: pvolume pvolume-joined pswitch pswitch-joined Playback channels: Mono Limits: Playback 0 - 31 Mono: Playback 25 [81%] [on] Simple mixer control 'Headphone',0 Capabilities: pvolume pswitch Playback channels: Front Left - Front Right Limits: Playback 0 - 31 Front Left: Playback 24 [77%] [on] Front Right: Playback 24 [77%] [on] Simple mixer control 'Headphone Jack Sense',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [off] Simple mixer control 'PCM',0 Capabilities: pvolume pswitch Playback channels: Front Left - Front Right Limits: Playback 0 - 31 Front Left: Playback 29 [94%] [on] Front Right: Playback 29 [94%] [on] Simple mixer control 'Line',0 Capabilities: pvolume pswitch cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: Playback 0 - 31 Front Left: Playback 26 [84%] [on] Capture [off] Front Right: Playback 26 [84%] [on] Capture [off] Simple mixer control 'Line Jack Sense',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [off] Simple mixer control 'CD',0 Capabilities: pvolume pswitch cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: Playback 0 - 31 Front Left: Playback 25 [81%] [on] Capture [off] Front Right: Playback 25 [81%] [on] Capture [off] Simple mixer control 'Mic',0 Capabilities: pvolume pvolume-joined pswitch pswitch-joined cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Playback channels: Mono Capture channels: Front Left - Front Right Limits: Playback 0 - 31 Mono: Playback 28 [90%] [on] Front Left: Capture [on] Front Right: Capture [on] Simple mixer control 'Mic Boost (+20dB)',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [off] Simple mixer control 'Mic Select',0 Capabilities: Mono: Simple mixer control 'Video',0 Capabilities: cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Capture channels: Front Left - Front Right Front Left: Capture [off] Front Right: Capture [off] Simple mixer control 'Phone',0 Capabilities: pvolume pvolume-joined pswitch pswitch-joined cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Playback channels: Mono Capture channels: Front Left - Front Right Limits: Playback 0 - 31 Mono: Playback 18 [58%] [on] Front Left: Capture [off] Front Right: Capture [off] Simple mixer control 'Aux',0 Capabilities: pvolume pswitch cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: Playback 0 - 31 Front Left: Playback 27 [87%] [on] Capture [off] Front Right: Playback 27 [87%] [on] Capture [off] Simple mixer control 'Mono Output Select',0 Capabilities: Mono: Simple mixer control 'Capture',0 Capabilities: cvolume cswitch Capture channels: Front Left - Front Right Limits: Capture 0 - 15 Front Left: Capture 0 [0%] [on] Front Right: Capture 0 [0%] [on] Simple mixer control 'Mix',0 Capabilities: cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Capture channels: Front Left - Front Right Front Left: Capture [off] Front Right: Capture [off] Simple mixer control 'Mix Mono',0 Capabilities: cswitch cswitch-joined cswitch-exclusive Capture exclusive group: 0 Capture channels: Front Left - Front Right Front Left: Capture [off] Front Right: Capture [off] Simple mixer control 'External Amplifier',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [off] Simple mixer control 'Stereo Mic',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [off] ------- cut here ------------- and now for something really weird: unplugging the external speakers resulted in the internal speakers making noises where I used to get silence. Then, when I flicked the headphone jack sense a few more times and/or plugged/unplugged the speakers a few times, the internal sound output stopped again. Daniel -- /------------------- Daniel Burrows <dburrows@debian.org> ------------------\ | "Debian developers have many superpowers, but | | time travel is not one of them." | | -- Richard Braakman | \- Does your computer have Super Cow Powers? ------- http://www.debian.org -/
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