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[ubuntu] Playback Hardware Devices always change after restart

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http://ubuntuforums.org – Hi, When I restart my computer, my playback hardware devices always change after restarting the machine. For example, when I type aplay -l, I will get the following output. Code: harnek@harnek-OEM:~$ aplay -l **** List of PLAYBACK Hardware Devices **** card 0: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0]   Subdevices: 1/1   Subdevice #0: subdevice #0 card 0: NVidia [HDA NVidia], device 7: HDMI 0 [HDMI 0]   Subdevices: 1/1   Subdevice #0: subdevice #0 card 0: NVidia [HDA NVidia], device 8: HDMI 0 [HDMI 0]   Subdevices: 1/1   Subdevice #0: (Hardware)