ACK: [SRU][B/OEM-B/C/D][PATCH 0/3] repeating crackling noise happens after 19.04 upgrade

[Stefan Bader]

On 18.04.19 05:55, Hui Wang wrote:
> BugLink: https://bugs.launchpad.net/bugs/1821663
> 
> This is because the kernel config CONFIG_SND_HDA_POWER_SAVE_DEFAULT is changed to
> 1 in the recent disco kernel.
> 
> I also backported the patch to cosmic and bionic since this patch is harmless to
> cosmic and bionic.
> 
> For Disco kernel, we only need 1 patch. Because of patch conflicting, cosmic
> kernel needs 2 patches and bionic kernel needs 3 patches.
> 
> [Impact]
> After CONFIG_SND_HDA_POWER_SAVE_DEFAULT is changed to 1, the codec runtime PM is
> enabled, on some codecs or for some hw design, there is noise with the codec
> runtime PM enabled.
> 
> 
> [Fix]
> put the machine in the power_save_black_list, this will set the power_save=0
> 
> [Test Case]
> just boot up and do some audio operations, there is no noise anymore
> 
> [Regression Risk]
> Low. this patch ony applies to the specific machines.
> 
> 
> 
> Hans de Goede (1):
>   ALSA: hda: Add Intel NUC7i3BNB to the power_save blacklist
> 
> Hui Wang (1):
>   ALSA: hda - Add two more machines to the power_save_blacklist
> 
> Jaroslav Kysela (1):
>   ALSA: hda - add Lenovo IdeaCentre B550 to the power_save_blacklist
> 
>  sound/pci/hda/hda_intel.c | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)
> 
Acked-by: Stefan Bader <stefan.bader at canonical.com>

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