我从 13.10 升级到了 14.10，现在每次使用耳机时左侧都会发出嘶嘶声（尝试了不同的耳机）。以前没有这个问题（或者至少没有明显的问题），现在这个问题变得非常严重。此外，它在 Windows 下仍然运行良好，所以我假设这是一个软件问题。我的笔记本是联想 T440p。
aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: HDMI [HDA Intel HDMI], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: HDMI [HDA Intel HDMI], device 7: HDMI 1 [HDMI 1]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: HDMI [HDA Intel HDMI], device 8: HDMI 2 [HDMI 2]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: PCH [HDA Intel PCH], device 0: ALC3232 Analog [ALC3232 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
dpkg -l | grep alsa
ii alsa-base 1.0.25+dfsg-0ubuntu4 all ALSA driver configuration files
ii alsa-utils 1.0.28-1ubuntu1 amd64 Utilities for configuring and using ALSA
ii bluez-alsa:amd64 4.101-0ubuntu20 amd64 Bluetooth ALSA support
ii gstreamer0.10-alsa:amd64 0.10.36-2 amd64 GStreamer plugin for ALSA
ii gstreamer1.0-alsa:amd64 1.4.3-1ubuntu1 amd64 GStreamer plugin for ALSA
dpkg -l | grep pulseaudio
ii gstreamer0.10-pulseaudio:amd64 0.10.31-3+nmu1ubuntu5 amd64 GStreamer plugin for PulseAudio
ii gstreamer1.0-pulseaudio:amd64 1.4.3-1ubuntu1 amd64 GStreamer plugin for PulseAudio
ii pulseaudio 1:4.0-0ubuntu22 amd64 PulseAudio sound server
ii pulseaudio-module-bluetooth 1:4.0-0ubuntu22 amd64 Bluetooth module for PulseAudio sound server
ii pulseaudio-module-x11 1:4.0-0ubuntu22 amd64 X11 module for PulseAudio sound server
ii pulseaudio-utils
链接到 alsa-info.sh 输出：http://www.alsa-project.org/db/?f=6321ee0e6a40fc13b0b0191969f190c5434d0ed1