（我使用 Ubuntu 14.04 64 位，声卡没有损坏，因为它在 Windows 上运行良好）
根据网上的大多数报告，在 Ubuntu 上安装 SC-5500p 在大多数情况下似乎轻而易举。有些报告甚至称其即插即用。总而言之，可以相当肯定地说，SC-5500p 是基于标准音频驱动程序构建的。
以下似乎是 GUI 声音管理器向我提供的更详细版本（这里不信任）：
$> cat /proc/asound/cards
0 [PCH ]: HDA-Intel - HDA Intel PCH
HDA Intel PCH at 0xf7410000 irq 47
1 [NVidia ]: HDA-Intel - HDA NVidia
HDA NVidia at 0xf6080000 irq 17
2 [Device ]: USB-Audio - USB Sound Device
USB Sound Device at usb-0000:00:14.0-1, full speed
以下是lsusb -v与具有“信任”功能的设备相关的输出。第二条条目（在“[...]”之后）的详细信息实际上毫无疑问地表明所指的设备是 SC-5500p。
Bus 003 Device 002: ID 15d9:0a4f Trust International B.V.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x15d9 Trust International B.V.
idProduct 0x0a4f
bcdDevice 1.00
iManufacturer 0
iProduct 1 USB OPTICAL MOUSE
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
[...]
Bus 003 Device 003: ID 145f:0143 Trust
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x145f Trust
idProduct 0x0143
bcdDevice 0.10
iManufacturer 0
iProduct 2 USB Sound Device
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
[...]
根据建议这里我修改了/etc/pulse/daemon.conf以下两个设置 - 但无济于事：
default-sample-channels = 6
enable-lfe-remixing = yes
/etc/pusle/daemon.conf的内容：
; daemonize = no
; fail = yes
; allow-module-loading = yes
; allow-exit = yes
; use-pid-file = yes
; system-instance = no
; local-server-type = user
; enable-shm = yes
; shm-size-bytes = 0 # setting this 0 will use the system-default, usually 64 MiB
; lock-memory = no
; cpu-limit = no
; high-priority = yes
; nice-level = -11
; realtime-scheduling = yes
; realtime-priority = 5
; exit-idle-time = 20
; scache-idle-time = 20
; dl-search-path = (depends on architecture)
; load-default-script-file = yes
; default-script-file = /etc/pulse/default.pa
; log-target = auto
; log-level = notice
; log-meta = no
; log-time = no
; log-backtrace = 0
resample-method = speex-float-1
; enable-remixing = yes
enable-lfe-remixing = yes
flat-volumes = no
; rlimit-fsize = -1
; rlimit-data = -1
; rlimit-stack = -1
; rlimit-core = -1
; rlimit-as = -1
; rlimit-rss = -1
; rlimit-nproc = -1
; rlimit-nofile = 256
; rlimit-memlock = -1
; rlimit-locks = -1
; rlimit-sigpending = -1
; rlimit-msgqueue = -1
; rlimit-nice = 31
; rlimit-rtprio = 9
; rlimit-rttime = 1000000
; default-sample-format = s16le
; default-sample-rate = 44100
; alternate-sample-rate = 48000
default-sample-channels = 6
; default-channel-map = front-left,front-right
default-fragments = 8
default-fragment-size-msec = 10
; enable-deferred-volume = yes
deferred-volume-safety-margin-usec = 1
; deferred-volume-extra-delay-usec = 0
在 Ubuntu 上安装其他 USB 设备时，有时会提到/etc/modules必须扩展一行来告诉内核加载驱动程序或其他内容。目前/etc/modules只包含两行：
> cat /etc/modules
lp
rtc
最后看到“card2”。我猜这又是我的信任设备：
> sudo aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC892 Analog [ALC892 Analog]
Subdevices: 0/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 1: ALC892 Digital [ALC892 Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 7: HDMI 1 [HDMI 1]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 8: HDMI 2 [HDMI 2]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 9: HDMI 3 [HDMI 3]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 2: Device [USB Sound Device], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0
答案1
看起来像设备曾是检测到了（如上面的记录所示），但 Pulse 没有检测到认出它。
killall pulseaudio
pulseaudio -k
现在它起作用了-甚至当设备在启动前尚未插入电源时。
最终，值得尝试上述两个命令，看看是否能起到作用。