Comment # 4 on bug 1060278 from Jonathan Cottrill

I also have a Dell XPS 15 (9560, BIOS 1.5.0), and was having similar sound
issues.

@Takashi Iwai, I tried the probe_mask=0x01 setting you suggested and rebooted.
I now have normal audio behavior; speakers and headphones work, including
volume controls (in alsamixer and KDE's mixer).

I'll paste my current modprobe settings at the bottom of this comment, in case
it's helpful to someone else. Although the problem is resolved for me, I'm
happy to provide additional system info if it's helpful.

Thanks!

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## /etc/modprobe.d/50-alsa.conf:
install snd /sbin/install-snd-module snd $CMDLINE_OPTS
install snd-pcm /sbin/install-snd-module snd-pcm $CMDLINE_OPTS
install snd-seq /sbin/install-snd-module snd-seq $CMDLINE_OPTS

## /etc/modprobe.d/50-sound.conf:
options snd-hda-intel power_save=0
options snd slots=snd-hda-intel
# nS1_.nzbEQF6aDG6:Intel Corporation
alias snd-card-0 snd-hda-intel

## /etc/modprobe.d/50-hda.conf:
options snd-hda-intel probe_mask=0x01