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authorHans de Goede <hdegoede@redhat.com>2018-02-22 14:20:35 +0100
committerTakashi Iwai <tiwai@suse.de>2018-02-24 11:27:31 +0100
commit1ba8f9d308174e647b864c36209b4d7934d99888 (patch)
tree3993ba03a4243f9679ca618e1bfa9a7519429756 /net/wireless
parent7229b12f5da33d5c376ee264f063703844b8092d (diff)
ALSA: hda: Add a power_save blacklist
On some boards setting power_save to a non 0 value leads to clicking / popping sounds when ever we enter/leave powersaving mode. Ideally we would figure out how to avoid these sounds, but that is not always feasible. This commit adds a blacklist for devices where powersaving is known to cause problems and disables it on these devices. Note I tried to put this blacklist in userspace first: https://github.com/systemd/systemd/pull/8128 But the systemd maintainers rightfully pointed out that it would be impossible to then later remove entries once we actually find a way to make power-saving work on listed boards without issues. Having this list in the kernel will allow removal of the blacklist entry in the same commit which fixes the clicks / plops. The blacklist only applies to the default power_save module-option value, if a user explicitly sets the module-option then the blacklist is not used. [ added an ifdef CONFIG_PM for the build error -- tiwai] BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1525104 BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=198611 Cc: stable@vger.kernel.org Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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