Created attachment 280343 [details] alsa-info.sh output Hi, I have a Dell Latitude 7480 and a stranger than usual audio popping/clicking/crackling issue. I run Fedora 29, fully updated. The thing is when I boot the laptop, the audio clicks at certain low sound volumes or events. For example when testing the speakers in the Gnome sound settings panel causes multiple clicks/pops. Listening to a audio/video file with certain silent parts causes pops/clicks. I have tried (almost) everything. Changing Pulseaudio setting does not work. Running a pure Jack system does not work. So the issue is not with Pulseaudio or Jack. I have tried disabling Intel HDA powersaving, that also does not work. But all problems disappear when I suspend and then resume the laptop. After resuming, everything works great. So at boot there are sound issues, but after a suspend/resume cycle everything is fine! See https://bugzilla.redhat.com/show_bug.cgi?id=1525104#c108 for more information and testing. I also attached alsa-info.sh.
I did some further digging around...found the following out: Cold boot: 1. difference between alsa-info.sh at boot vs after a resume/suspend cycle run 1 [latitude@latitude-7480 ~]$ diff alsa-info_cold_boot.txt alsa-info_resume1.txt 6c6 < !!Script ran on: Wed Jan 9 16:12:28 UTC 2019 --- > !!Script ran on: Wed Jan 9 16:15:33 UTC 2019 68,75c68,75 < /sys/bus/acpi/devices/PNP0C0F:00/status 9 < /sys/bus/acpi/devices/PNP0C0F:01/status 9 < /sys/bus/acpi/devices/PNP0C0F:02/status 9 < /sys/bus/acpi/devices/PNP0C0F:03/status 9 < /sys/bus/acpi/devices/PNP0C0F:04/status 9 < /sys/bus/acpi/devices/PNP0C0F:05/status 9 < /sys/bus/acpi/devices/PNP0C0F:06/status 9 < /sys/bus/acpi/devices/PNP0C0F:07/status 9 --- > /sys/bus/acpi/devices/PNP0C0F:00/status 11 > /sys/bus/acpi/devices/PNP0C0F:01/status 11 > /sys/bus/acpi/devices/PNP0C0F:02/status 11 > /sys/bus/acpi/devices/PNP0C0F:03/status 11 > /sys/bus/acpi/devices/PNP0C0F:04/status 11 > /sys/bus/acpi/devices/PNP0C0F:05/status 11 > /sys/bus/acpi/devices/PNP0C0F:06/status 11 > /sys/bus/acpi/devices/PNP0C0F:07/status 11 546c546 < crw-rw----+ 1 root audio 116, 2 Jan 9 17:11 /dev/snd/pcmC0D0p --- > crw-rw----+ 1 root audio 116, 2 Jan 9 17:14 /dev/snd/pcmC0D0p run 2 (another resume/suspend cycle) no difference except date/time 2. cat /proc/interrupts | grep snd at boot 132: 2936 0 0 0 IR-PCI-MSI 514048-edge snd_hda_intel:card0 after resume/suspend cycle 130: 0 0 3 0 IR-PCI-MSI 514048-edge snd_hda_intel:card0 130: 0 0 999 0 IR-PCI-MSI 514048-edge snd_hda_intel:card0 It seems to be switching IRQs with the ethernet card, I tried turning off the ethernet device (found another bug with the ethernet device in the process...) in the BIOS and this time snd_hda_intel did not switch IRQs after resume/suspend, but the clicking was still present at cold boot and disappeared at resume/suspend cycle So nothing important I assume, but this is all I could find, I still have no clue as to why this is happening :)