** Description changed: - This is for tracking purpose. + [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.
** Changed in: linux (Ubuntu Jammy) Importance: Undecided => High ** Changed in: linux (Ubuntu Mantic) Importance: Undecided => High ** Changed in: linux (Ubuntu Noble) Importance: Undecided => High -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2058573 Title: alsa/realtek: adjust max output valume for headphone on 2 LG machines Status in HWE Next: New Status in linux package in Ubuntu: In Progress Status in linux source package in Jammy: In Progress Status in linux source package in Mantic: In Progress Status in linux source package in Noble: In Progress 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. To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/2058573/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
