Takashi, all,
On several of my machines there is no longer any sound output when running the latest linux-next (20150528). Activity can be seen in a mixer such as pavucontrol suggesting that there should be sound, but both the speakers and head phones are silent.
I have bisected the kernel and found that the following patch introduced the bug.
From 49fb18972581a781658a4637de76e6069ed5964e Mon Sep 17 00:00:00 2001 From: Takashi Iwai tiwai@suse.de Date: Wed, 27 May 2015 08:37:19 +0200 Subject: [PATCH] ALSA: hda - Set stream_pm ops automatically by generic parser
This allows user to test power_save_node feature via sysfs or patch firmware even on the codecs that don't specify it. It'll also save a few lines.
Signed-off-by: Takashi Iwai tiwai@suse.de --- sound/pci/hda/hda_generic.c | 5 ++++- sound/pci/hda/patch_realtek.c | 1 - sound/pci/hda/patch_sigmatel.c | 1 - sound/pci/hda/patch_via.c | 1 - 4 files changed, 4 insertions(+), 4 deletions(-)