[PATCH] ALSA: hda/realtek: reset eapd coeff to default value for alc287

[Takashi Iwai]

On Fri, 07 May 2021 04:44:52 +0200,
Hui Wang wrote:
> 
> Ubuntu users reported an audio bug on the Lenovo Yoga Slim 7 14IIL05,
> he installed dual OS (Windows + Linux), if he booted to the Linux
> from Windows, the Speaker can't work well, it has crackling noise,
> if he poweroff the machine first after Windows, the Speaker worked
> well.
> 
> Before rebooting or shutdown from Windows, the Windows changes the
> codec eapd coeff value, but the BIOS doesn't re-initialize its value,
> when booting into the Linux from Windows, the eapd coeff value is not
> correct. To fix it, set the codec default value to that coeff register
> in the alsa driver.
> 
> BugLink: http://bugs.launchpad.net/bugs/1925057
> Suggested-by: Kailang Yang <kailang at realtek.com>
> Cc: <stable at vger.kernel.org>
> Signed-off-by: Hui Wang <hui.wang at canonical.com>

Thanks, applied.


Takashi