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    • Takashi Iwai's avatar
      ALSA: hda/hdmi: Fix keep_power assignment for non-component devices · c2c3657f
      Takashi Iwai authored
      It's been reported that, when neither nouveau nor Nvidia graphics
      driver is used, the screen starts flickering.  And, after comparing
      between the working case (stable 4.4.x) and the broken case, it turned
      out that the problem comes from the audio component binding.  The
      Nvidia and AMD audio binding code clears the bus->keep_power flag
      whenever snd_hdac_acomp_init() succeeds.  But this doesn't mean that
      the component is actually bound, but it merely indicates that it's
      ready for binding.  So, when both nouveau and Nvidia are blacklisted
      or not ready, the driver keeps running without the audio component but
      also with bus->keep_power = false.  This made the driver runtime PM
      kicked in and powering down when unused, which results in flickering
      in the graphics side, as it seems.
      
      For fixing the bug, this patch moves the bus->keep_power flag change
      into generic_acomp_notifier_set() that is the function called from the
      master_bind callback of component ops; i.e. it's guaranteed that the
      binding succeeded.
      
      BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=208609
      Fixes: 5a858e79 ("ALSA: hda - Disable audio component for legacy Nvidia HDMI codecs")
      Cc: <stable@vger.kernel.org>
      Link: https://lore.kernel.org/r/20200728082033.23933-1-tiwai@suse.deSigned-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      c2c3657f
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