Le 23 sept. 2013 05:20, "John Davis"
Hello
Hi!
I am trying to get my multimedia volume up and down buttons to work. I am reading various notes on amixer usage and it seems for others they can adjust current volume settings up and down. For me, i can only adjust to a fixed value.
You forgot to read the man page...
For example, this will set my volume to 50%
[davis@x200 ~]$ amixer -c 0 cset numid=15,iface=MIXER,name='Master
Playback
Volume' 50% numid=15,iface=MIXER,name='Master Playback Volume' ; type=INTEGER,access=rw---R--,values=1,min=0,max=74,step=0 : values=37 | dBscale-min=-74.00dB,step=1.00dB,mute=0
But then if I want to adjust it by 2dB it will not adjust up or down by 2dB instead it sets the value to 2.
If I set it to 2dB+ or simply the value 2 it does the same thing.
Yes, this is correct and it's not a bug.
[davis@x200 ~]$ amixer -c 0 cset numid=15,iface=MIXER,name='Master
Playback
Volume' 2dB- numid=15,iface=MIXER,name='Master Playback Volume' ; type=INTEGER,access=rw---R--,values=1,min=0,max=74,step=0 : values=2 | dBscale-min=-74.00dB,step=1.00dB,mute=0
[davis@x200 ~]$ amixer -c 0 cset numid=15,iface=MIXER,name='Master Playback Volume' 2dB numid=15,iface=MIXER,name='Master Playback Volume' ; type=INTEGER,access=rw---R--,values=1,min=0,max=74,step=0 : values=2 | dBscale-min=-74.00dB,step=1.00dB,mute=0 dB up, it will instead set the value to 2 instead of 39.
[davis@x200 ~]$ amixer -c 0 cset numid=15,iface=MIXER,name='Master Playback Volume' 2dB+ numid=15,iface=MIXER,name='Master Playback Volume' ; type=INTEGER,access=rw---R--,values=1,min=0,max=74,step=0 : values=2 | dBscale-min=-74.00dB,step=1.00dB,mute=0
It appears the parser is ignoring dB and or +/- and only recognizing %.
If you look at the man page, you'll notice that only set and sset take a suffix, but not cset. If you really need cset instead of set, you'll have to compute the final value yourself.
-- John F. Davis 6 Kandes Court Durham, NC 27713 919-888-8358
独树一帜
Have a nice day! Joan Rieu