"If your card 2 only support stereo, it is strange that surround21 can be opened"
Maybe, maybe not; the assertion that the device is stereo is based on the fact that it's a headset and has two obvious speakers. Whether it has some kind of subwoofer-style audio channel is not something I'm certain about. For clarification on the devices being referenced: * Details on the headset can be found here: http://support.logitech.com/en_us/product/stereo-headset-h390 * Details on the desktop audio device (specifically named "Device")can be found here: https://www.sabrent.com/category/audio/USB-SND8/ "The major problem is why you override pcm.default with dmix whenn you running pulseaudio" I'm not sure if this is a question or not, but I'll assume it is. The .asoundrc was originally set to use the pulse plug, rather than dmix. However, when the problem first began, I had to turn off PulseAudio in order to get sound at all for most of the programs I'm running. However, the audio device used by default in ALSA is the built-in audio in the desktop, which I do not use; the USB devices listed above are cleaner and clearer. I also didn't want to have programs lock up while waiting for access to the audio device. Therefore, I changed the audio default, first to Jack (hence the stanzas with Jack on them), and then I decided it would just be better to use the dmix device until the problem could be solved. This way, I can still make use of everything on the system, even if screencasts remain impossible. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to pulseaudio in Ubuntu. https://bugs.launchpad.net/bugs/1562208 Title: OpenAL Software Silent/Freezes Status in openal-soft package in Ubuntu: New Status in pulseaudio package in Ubuntu: Incomplete Bug description: Following an update I made this week to the system, I have attempted to play a number of games, including "X Rebirth" from gog.com, "Minecraft," downloaded from Mojang. In those games making use of the OpenAL library, no sound is coming through PulseAudio; there is a stream listed in Pulse, but there is no sound, and the meter does not indicate that PulseAudio is even receiving any audio. I am also noticing the problem in Blender, but in this case, the issue seems to cause the VSE to stick to the frame it's at when set to "A/V Sync" To make matters worse, once the stream shows in "pavucontrol," the program won't end. If the audio is integral to the software, such as the case of Blender, the software itself will freeze when I attempt to close it; I will have to kill the program to make it shut down completely. Other programs that use a sound server with OpenAL seem to close, but the stream is still showing in pavucontrol, and the process is still shown as running in "ps x". Killing the frozen app makes it go away; and so far, the normal kill command will work; there's no need to "-9" it. Even openal-info freezes, after displaying the following: ----------------------- Available playback devices: CM106 Like Sound Device Analog Stereo Available capture devices: M-Audio Fast Track MKII Analog Stereo Monitor of CM106 Like Sound Device Analog Stereo Default playback device: CM106 Like Sound Device Analog Stereo Default capture device: CM106 Like Sound Device Analog Stereo ALC version: 1.1 ** Info for device "CM106 Like Sound Device Analog Stereo" ** ALC version: 1.1 ALC extensions: ALC_ENUMERATE_ALL_EXT, ALC_ENUMERATION_EXT, ALC_EXT_CAPTURE, ALC_EXT_DEDICATED, ALC_EXT_disconnect, ALC_EXT_EFX, ALC_EXT_thread_local_context, ALC_SOFTX_device_clock, ALC_SOFTX_HRTF, ALC_SOFT_loopback, ALC_SOFTX_midi_interface, ALC_SOFT_pause_device OpenAL vendor string: OpenAL Community OpenAL renderer string: OpenAL Soft OpenAL version string: 1.1 ALSOFT 1.16.0 OpenAL extensions: AL_EXT_ALAW, AL_EXT_DOUBLE, AL_EXT_EXPONENT_DISTANCE, AL_EXT_FLOAT32, AL_EXT_IMA4, AL_EXT_LINEAR_DISTANCE, AL_EXT_MCFORMATS, AL_EXT_MULAW, AL_EXT_MULAW_MCFORMATS, AL_EXT_OFFSET, AL_EXT_source_distance_model, AL_LOKI_quadriphonic, AL_SOFT_block_alignment, AL_SOFT_buffer_samples, AL_SOFT_buffer_sub_data, AL_SOFT_deferred_updates, AL_SOFT_direct_channels, AL_SOFT_loop_points, AL_SOFT_MSADPCM, AL_SOFT_source_latency, AL_SOFT_source_length EFX version: 1.0 Max auxiliary sends: 4 Supported filters: Low-pass, High-pass, Band-pass Supported effects: EAX Reverb, Reverb, Chorus, Distortion, Echo, Flanger, Ring Modulator, Compressor, Equalizer, Dedicated Dialog, Dedicated LFE ------------------- This problem persisted, even following a clean installation with no PPAs installed. I'm assuming the problem is in OpenAL, because programs not making use of that library (YouTube, VLC, etc.) don't seem to have the problem. The update that seemed to be the breaking point was an update to kernel 4.2.0-34 (I no longer have the original system, thinking a full restore would fix things), so there might be something in the new kernel that's interfering with OpenAL. ------------------- The required information: Description: Ubuntu 15.10 Release: 15.10 libopenal1: Installed: 1:1.16.0-3 Candidate: 1:1.16.0-3 Version table: *** 1:1.16.0-3 0 500 http://us.archive.ubuntu.com/ubuntu/ wily/universe amd64 Packages 100 /var/lib/dpkg/status ------------------- Please let me know if there's any additional information that I will need to provide. 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