** Changed in: hwe-next
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/2058573
Title:
alsa/realtek: adjust max output valume for headphone on 2 LG machines
Status in HWE Next:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Jammy:
Fix Released
Status in linux source package in Mantic:
Fix Released
Status in linux source package in Noble:
Fix Released
Bug description:
[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.
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