ACK: [SRU][N/M/J][PATCH 0/1] alsa/realtek: adjust max output valume for headphone on 2 LG machines

[Stefan Bader]

On 21.03.24 03:22, Hui Wang wrote:
> BugLink: https://bugs.launchpad.net/bugs/2058573
> 
> Currently this patch is in the linux-next, will be in the unstable
> kernel automatically.
> 
> [Impact]
> In an oem project, we found the max playback volume of the headphone
> is too high on 2 LG machines, it could bring harm to listeners. As
> requested by OEM customer, we need to decrease the max volume.
> 
> 
> [Fix]
> Cherry-pick a mainline kernel patch, this could fix this issue.
> 
> [Test]
> Booting with the patched kernel, plug the headphone, set the playback
> volue to max, run:
> amixer -c1 contents | grep -n2 "Headphone Playback Volume"
> 
> The value is 77,77 instead of 87,87 like below:
> numid=1,iface=MIXER,name='Headphone Playback Volume'
>    ; type=INTEGER,access=rw---R--,values=2,min=0,max=87,step=0
>    : values=77,77
> 
> 
> [Where problems could occur]
> This patch changes the amplifier's default value, probably
> will make the audio malfunction, but this change is specific
> to those 2 LG machines (by SSID), will not bring regression
> to other machines. For those 2 machines, we already tested patch,
> the audio worked well.
> 
> 
> 
> Hui Wang (1):
>    ALSA: hda/realtek: fix the hp playback volume issue for LG machines
> 
>   sound/pci/hda/patch_realtek.c | 26 ++++++++++++++++++++++++++
>   1 file changed, 26 insertions(+)
> 

Acked-by: Stefan Bader <stefan.bader at canonical.com>
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