In alsamixer, on the third ([All])
Card: HDA Intel
Chip: Realtek ALC662 rev1
View: F3: Playback F4: Capture F5:[All]
Item: e-Mic Boost
screen, there are identical repeated entries for
e-Mic Boost, and i-Mic Boost.
Amixer doesn't have this problem
$ amixer controls|sort -t = -k 2n
numid=1,iface=MIXER,name='Master Playback Volume'
numid=2,iface=MIXER,name='Master Playback Switch'
numid=3,iface=MIXER,name='e-Mic Boost'
numid=4,iface=MIXER,name='e-Mic Playback Volume'
numid=5,iface=MIXER,name='e-Mic Playback Switch'
numid=6,iface=MIXER,name='i-Mic Boost'
numid=7,iface=MIXER,name='i-Mic Playback Volume'
numid=8,iface=MIXER,name='i-Mic Playback Switch'
numid=9,iface=MIXER,name='Capture Switch'
numid=10,iface=MIXER,name='Capture Volume'
numid=11,iface=MIXER,name='Beep Playback Volume'
numid=12,iface=MIXER,name='Beep Playback Switch'
And also alsamixer on my Thinkpad r50e doesn't have this problem.
It only happens on my Asus Eeepc 702 8G.