alsa-project/alsa-lib issue #105 was opened from rombru: Hello, I'm not an expert in linux systems. I will try to give a maximum of information. I've bought Bowers & Wilkins PX7 headphones. They doesn't work using USB on Ubuntu. Using Ubuntu and bluetooth, or audio jack, the headphones work well. Using Windows 10 and USB, the headphones work well. I d'like too use them with USB on Ubuntu because that recharge them in parallel. Problems while the headphons are connected : On Chrome : The videos are played too fast and there's no sound (Youtube & Twitch). On Firefox : The videos are played too fast and there's a crackling sound (Youtube & Twitch). On VLC : No sound I've tried with Ubuntu 20.04 & 18.04. They are set as default audio device I've played with PulseAudio and alsamixer (reinstall, mute/unmute, ...) The headphones are set as fallback in PulseAudio. Trying to find the issue, i've make some test found on Google : I've added pcie_aspm=off in GRUB_CMDLINE_LINUX_DEFAULT Setting devices as default in /etc/asound.conf --- The ALSA part I think the problem come from ALSA, i've found the errors : `Failed to load module "module-alsa-card` followed few lines later by `Most likely this is a bug in the ALSA driver 'snd_usb_audio'. Please report this issue to the ALSA developers.` Output of `journalctl --user -u pulseaudio` is [here](https://gist.githubusercontent.com/rombru/eb4ca14168494e95c62a961f92e91a90/raw/52c93f01b9c617f823308183d32d07f8e9033bc1/journalctl.txt) Output of `pulseaudio -vvvvv` is [here](https://gist.githubusercontent.com/rombru/eb4ca14168494e95c62a961f92e91a90/raw/52c93f01b9c617f823308183d32d07f8e9033bc1/pulseaudio.txt) Output of `pacmd ls` is [here](https://gist.githubusercontent.com/rombru/eb4ca14168494e95c62a961f92e91a90/raw/52c93f01b9c617f823308183d32d07f8e9033bc1/pacmd.txt) Please, tell me if you need something more to analyse the problem. Issue URL : https://github.com/alsa-project/alsa-lib/issues/105 Repository URL: https://github.com/alsa-project/alsa-lib
