https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/tree/Documentation/sound/alsa
/ALSA-Configuration.txt
have you changed power_save or power_save_controller setting ?
power_save - Automatic power-saving timeout (in second, 0 =
disable)
power_save_controller - Reset HD-audio controller in power-saving mode
(default = on)
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https://bugs.launchpad.net/bugs/1038479
Title:
[Satellite L755, Conexant CX20585, Speaker, Internal] fails after a
while
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