A NOTE has been added to this issue. ====================================================================== <https://bugtrack.alsa-project.org/alsa-bug/view.php?id=2001> ====================================================================== Reported By: andersin Assigned To: ====================================================================== Project: ALSA - utils Issue ID: 2001 Category: amixer Reproducibility: always Severity: minor Priority: normal Status: new ====================================================================== Date Submitted: 04-05-2006 00:06 CEST Last Modified: 08-02-2006 14:27 CEST ====================================================================== Summary: fast repeated calls to adjust volume incrementally fail for multi channel control of SB Extigy Description: The SB Extigy has multiple channels which amixer reports as: Simple mixer control 'Master',0 Capabilities: pvolume pswitch pswitch-joined Playback channels: Front Left - Front Right - Rear Left - Rear Right - Front Center - Woofer Limits: Playback 0 - 200 Mono: Front Left: Playback 146 [73%] [on] Front Right: Playback 146 [73%] [on] Rear Left: Playback 146 [73%] [on] Rear Right: Playback 146 [73%] [on] Front Center: Playback 146 [73%] [on] Woofer: Playback 146 [73%] [on] repeated calls to amixer to incrementally adjust the volume make the volume "wobble". The volume stays at about the same value but goes slightly up and down on different speakers (can't quite pin down which ones, but the effect is noticeable). The effect can be easily reproduced: while ( true ); do amixer sset Master 2- & done; Note the &. It is necessary, since while ( true ); do amixer sset Master 2-; done; will work just fine, however even here a small quirk can be observed. I let the above loop run and observe the volume through alsamixer. Now I issue in another shell amixer sset Master 150. The volume does get set to the desired value on all controls associated with master (all 6 channels). However, sometimes (often for the last speakers) the volume gets reset to a lower value than it used to be before I use amixer. Example: channel 1 2 3 4 5 6 --------------------------------------------- values before control 100 100 100 100 100 100 values set by amixer 150 150 150 150 150 150 values for next step 148 148 148 98 98 98 How many channels are affected is up to chance, but the higher ones 5+6 have a higher chance of being subject to this issue so I guess it could be some race between the various amixer processes. Note that this behavior is fine if I use a mono volume control. ====================================================================== ---------------------------------------------------------------------- Raymond - 08-01-06 16:28 ---------------------------------------------------------------------- Would you post the content of test.state after 'alsactl store -f test.state' ? ---------------------------------------------------------------------- andersin - 08-02-06 14:27 ---------------------------------------------------------------------- Ok, here it is: state.Extigy { control.1 { comment.access 'read write' comment.type BOOLEAN comment.count 1 iface MIXER name 'PCM Playback Switch' value true } control.2 { comment.access 'read write' comment.type INTEGER comment.count 1 comment.range '0 - 200' iface MIXER name 'PCM Playback Volume' value 200 } control.3 { comment.access 'read write' comment.type BOOLEAN comment.count 1 iface MIXER name 'Digital In Switch' value true } control.4 { comment.access 'read write' comment.type INTEGER comment.count 1 comment.range '0 - 200' iface MIXER name 'Digital In Volume' value 200 } control.5 { comment.access 'read write' comment.type BOOLEAN comment.count 1 iface MIXER name 'Line Playback Switch' value false } control.6 { comment.access 'read write' comment.type INTEGER comment.count 2 comment.range '0 - 200' iface MIXER name 'Line Playback Volume' value.0 176 value.1 176 } control.7 { comment.access 'read write' comment.type INTEGER comment.count 1 comment.range '0 - 200' iface MIXER name 'Line Playback Volume' index 1 value 176 } control.8 { comment.access 'read write' comment.type BOOLEAN comment.count 1 iface MIXER name '3D Stereo Extender Switch' value false } control.9 { comment.access 'read write' comment.type BOOLEAN comment.count 1 iface MIXER name 'Mic Playback Switch' value false } control.10 { comment.access 'read write' comment.type INTEGER comment.count 1 comment.range '0 - 200' iface MIXER name 'Mic Playback Volume' value 200 } control.11 { comment.access 'read write' comment.type INTEGER comment.count 1 comment.range '0 - 6' iface MIXER name 'Channel Routing Mode Select' value 6 } control.12 { comment.access 'read write' comment.type ENUMERATED comment.count 1 comment.item.0 'Input 0' comment.item.1 Mic comment.item.2 Mixer iface MIXER name 'Capture Input Source' value 'Input 0' } control.13 { comment.access 'read write' comment.type BOOLEAN comment.count 1 iface MIXER name 'Capture Switch' value true } control.14 { comment.access 'read write' comment.type INTEGER comment.count 1 comment.range '0 - 200' iface MIXER name 'Capture Volume' value 10 } control.15 { comment.access 'read write' comment.type BOOLEAN comment.count 1 iface MIXER name 'Master Playback Switch' value true } control.16 { comment.access 'read write' comment.type INTEGER comment.count 6 comment.range '0 - 200' iface MIXER name 'Master Playback Volume' value.0 130 value.1 130 value.2 130 value.3 130 value.4 130 value.5 130 } control.17 { comment.access 'read write' comment.type INTEGER comment.count 1 comment.range '0 - 200' iface MIXER name 'Master Playback Volume' index 1 value 130 } control.18 { comment.access 'read write' comment.type INTEGER comment.count 1 comment.range '0 - 96' iface MIXER name 'Tone Control - Bass' value 48 } control.19 { comment.access 'read write' comment.type INTEGER comment.count 1 comment.range '0 - 96' iface MIXER name 'Tone Control - Treble' value 48 } control.20 { comment.access 'read write' comment.type BOOLEAN comment.count 1 iface MIXER name 'Speaker Playback Switch' value true } control.21 { comment.access 'read write' comment.type BOOLEAN comment.count 1 iface MIXER name 'Digital Out Playback Switch' value false } control.22 { comment.access 'read write' comment.type BOOLEAN comment.count 1 iface MIXER name 'Digital Out1 Playback Switch' value false } control.23 { comment.access 'read write' comment.type BOOLEAN comment.count 1 iface MIXER name 'IEC958 Optical Playback Switch' value false } } Issue History Date Modified Username Field Change ====================================================================== 04-05-06 00:06 andersin New Issue 08-01-06 16:28 Raymond Note Added: 0011375 08-02-06 14:27 andersin Note Added: 0011387 ====================================================================== ------------------------------------------------------------------------- Take Surveys. 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