Le 23 sept. 2013 05:20, "John Davis" <davisjf@xxxxxxxxx> a écrit : > > 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
