do your 7.1 headset support stereo ? pot the pulseaudio verbose log
https://wiki.ubuntu.com/PulseAudio/Log lsusb -vvvv device.bus = "usb" device.vendor.id = "1532" device.vendor.name = "Razer USA, Ltd" device.product.id = "000e" device.product.name = "Razer Megalodon" device.serial = "Razer_Razer_Megalodon" device.string = "2" device.description = "Razer Megalodon" module-udev-detect.discovered = "1" device.icon_name = "audio-card-usb" profiles: input:analog-mono: Analog Mono Input (priority 1) output:analog-surround-41: Analog Surround 4.1 Output (priority 800) output:analog-surround-41+input:analog-mono: Analog Surround 4.1 Output + Analog Mono Input (priority 801) output:analog-surround-50: Analog Surround 5.0 Output (priority 700) output:analog-surround-50+input:analog-mono: Analog Surround 5.0 Output + Analog Mono Input (priority 701) output:analog-surround-51: Analog Surround 5.1 Output (priority 800) output:analog-surround-51+input:analog-mono: Analog Surround 5.1 Output + Analog Mono Input (priority 801) output:analog-surround-71: Analog Surround 7.1 Output (priority 700) output:analog-surround-71+input:analog-mono: Analog Surround 7.1 Output + Analog Mono Input (priority 701) off: Off (priority 0) active profile: <output:analog-surround-71+input:analog-mono> sinks: alsa_output.usb-Razer_Razer_Megalodon-00-Megalodon.analog-surround-71/#1: Razer Megalodon Analog Surround 7.1 sources: alsa_output.usb-Razer_Razer_Megalodon-00-Megalodon.analog-surround-71.monitor/#1: Monitor of Razer Megalodon Analog Surround 7.1 alsa_input.usb-Razer_Razer_Megalodon-00-Megalodon.analog-mono/#2: Razer Megalodon Analog Mono ports: analog-output: Analog Output (priority 9900, latency offset 0 usec, available: unknown) properties: do your headset have volume control at the audio processing unit ? http://www.razerzone.com/gaming-audio/razer-megalodon/ !!-------Mixer controls for card 2 [Megalodon] Card hw:2 'Megalodon'/'Razer Razer Megalodon at usb-0000:00:1d.0-1.2.1.1, full speed' Mixer name : 'USB Mixer' Components : 'USB1532:000e' Controls : 2 Simple ctrls : 1 Simple mixer control 'PCM',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1184025 Title: [USB-Audio - Razer Megalodon, playback] Underruns, dropouts or crackling sound To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1184025/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
