This is a note to let you know that I've just added the patch titled
ALSA: hda/realtek: Limit mic boost on T480
to the 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: alsa-hda-realtek-limit-mic-boost-on-t480.patch and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From 85981dfd6b0a0fd9ed87ca4a525981b67c21f098 Mon Sep 17 00:00:00 2001
From: Benjamin Berg bberg@redhat.com Date: Wed, 14 Feb 2018 13:29:39 +0100 Subject: ALSA: hda/realtek: Limit mic boost on T480
From: Benjamin Berg bberg@redhat.com
commit 85981dfd6b0a0fd9ed87ca4a525981b67c21f098 upstream.
The internal mic boost on the T480 is too high. Fix this by applying the ALC269_FIXUP_LIMIT_INT_MIC_BOOST fixup to the machine to limit the gain.
Signed-off-by: Benjamin Berg bberg@redhat.com Tested-by: Benjamin Berg bberg@redhat.com Cc: stable@vger.kernel.org Signed-off-by: Takashi Iwai tiwai@suse.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- sound/pci/hda/patch_realtek.c | 1 + 1 file changed, 1 insertion(+)
--- a/sound/pci/hda/patch_realtek.c +++ b/sound/pci/hda/patch_realtek.c @@ -6414,6 +6414,7 @@ static const struct snd_pci_quirk alc269 SND_PCI_QUIRK(0x17aa, 0x224b, "Thinkpad", ALC298_FIXUP_TPT470_DOCK), SND_PCI_QUIRK(0x17aa, 0x224c, "Thinkpad", ALC298_FIXUP_TPT470_DOCK), SND_PCI_QUIRK(0x17aa, 0x224d, "Thinkpad", ALC298_FIXUP_TPT470_DOCK), + SND_PCI_QUIRK(0x17aa, 0x225d, "Thinkpad T480", ALC269_FIXUP_LIMIT_INT_MIC_BOOST), SND_PCI_QUIRK(0x17aa, 0x30bb, "ThinkCentre AIO", ALC233_FIXUP_LENOVO_LINE2_MIC_HOTKEY), SND_PCI_QUIRK(0x17aa, 0x30e2, "ThinkCentre AIO", ALC233_FIXUP_LENOVO_LINE2_MIC_HOTKEY), SND_PCI_QUIRK(0x17aa, 0x310c, "ThinkCentre Station", ALC294_FIXUP_LENOVO_MIC_LOCATION),
Patches currently in stable-queue which might be from bberg@redhat.com are
queue-4.15/alsa-hda-realtek-limit-mic-boost-on-t480.patch