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    ALSA: hda: Add a power_save blacklist · 1ba8f9d3
    Hans de Goede 提交于
    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: NHans de Goede <hdegoede@redhat.com>
    Signed-off-by: NTakashi Iwai <tiwai@suse.de>
    1ba8f9d3
hda_intel.c 73.9 KB