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    ALSA: hda/realtek - Always immediately update mute LED with pin VREF · e40bdb03
    Takashi Iwai 提交于
    Some HP laptops have a mute mute LED controlled by a pin VREF.  The
    Realtek codec driver updates the VREF via vmaster hook by calling
    snd_hda_set_pin_ctl_cache().
    
    This works fine as long as the driver is running in a normal mode.
    However, when the VREF change happens during the codec being in
    runtime PM suspend, the regmap access will skip and postpone the
    actual register change.  This ends up with the unchanged LED status
    until the next runtime PM resume even if you change the Master mute
    switch.  (Interestingly, the machine keeps the LED status even after
    the codec goes into D3 -- but it's another story.)
    
    For improving this usability, let the driver temporarily powering up /
    down only during the pin VREF change.  This can be achieved easily by
    wrapping the call with snd_hda_power_up_pm() / *_down_pm().
    
    Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=199073
    Cc: <stable@vger.kernel.org>
    Signed-off-by: NTakashi Iwai <tiwai@suse.de>
    e40bdb03
patch_realtek.c 246.5 KB