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I see the same behaviour, but it does not annoy me enough to disable it. Yes, it is caused by a audio chip power saving mode which was enabled by default on Fedora 28. This happens quite often, especially on badly designed computer mainboards.

Implementation tracking bug: https://bugzilla.redhat.com/show_bug.cgi?id=1520902

In case you are using an intel chip, the temporary solution to disable power saving is running echo 0 > /sys/module/snd_hda_intel/parameters/power_save. Creating the file /etc/modprobe.d/audio_disable_powersave.conf with this line options snd_hda_intel power_save=0 should disable power saving on your sound chip permanently after the next reboot, you may need to regenerate your initramfs using dracut though.

If your device has no intel driver, please have a look at the kernel module. You need to list your kernel modules first using lsmod, then find your vendor's name in some of the snd_hda_ names. Documentation on that kernel module may help you get the right options.

I see the same behaviour, but it does not annoy me enough to disable it. Yes, it is caused by a audio chip power saving mode which was enabled by default on Fedora 28. This happens quite often, especially on badly designed computer mainboards.

mainboards.

Implementation tracking bug: https://bugzilla.redhat.com/show_bug.cgi?id=1520902

In case you are using an intel chip, the temporary solution to disable power saving is running echo 0 > /sys/module/snd_hda_intel/parameters/power_save. Creating the file /etc/modprobe.d/audio_disable_powersave.conf with this line options snd_hda_intel power_save=0 should disable power saving on your sound chip permanently after the next reboot, you may need to regenerate your initramfs using dracut though.

If your device has no intel driver, please have a look at the kernel module. You need to list your kernel modules first using lsmod, then find your vendor's name in some of the snd_hda_ names. Documentation on that kernel module may help you get the right options.