This is a note to let you know that I've just added the patch titled
ALSA: usb-audio: Add dB range mapping for Sennheiser Communications Headset PC 8
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
alsa-usb-audio-add-db-range-mapping-for-sennheiser-communications-headset-pc-8.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ab2165e2e6ed17345ffa8ee88ca764e8788ebcd7 Mon Sep 17 00:00:00 2001
From: Timo Gurr <timo.gurr@xxxxxxxxx>
Date: Mon, 3 May 2021 13:08:22 +0200
Subject: ALSA: usb-audio: Add dB range mapping for Sennheiser Communications Headset PC 8
From: Timo Gurr <timo.gurr@xxxxxxxxx>
commit ab2165e2e6ed17345ffa8ee88ca764e8788ebcd7 upstream.
The decibel volume range contains a negative maximum value resulting in
pipewire complaining about the device and effectivly having no sound
output. The wrong values also resulted in the headset sounding muted
already at a mixer level of about ~25%.
PipeWire BugLink: https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/1049
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=212897
Signed-off-by: Timo Gurr <timo.gurr@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210503110822.10222-1-tiwai@xxxxxxx
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/usb/mixer_maps.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
--- a/sound/usb/mixer_maps.c
+++ b/sound/usb/mixer_maps.c
@@ -348,6 +348,13 @@ static struct usbmix_name_map bose_compa
{ 0 } /* terminator */
};
+/* Sennheiser Communications Headset [PC 8], the dB value is reported as -6 negative maximum */
+static const struct usbmix_dB_map sennheiser_pc8_dB = {-9500, 0};
+static const struct usbmix_name_map sennheiser_pc8_map[] = {
+ { 9, NULL, .dB = &sennheiser_pc8_dB },
+ { 0 } /* terminator */
+};
+
/*
* Dell usb dock with ALC4020 codec had a firmware problem where it got
* screwed up when zero volume is passed; just skip it as a workaround
@@ -508,6 +515,11 @@ static struct usbmix_ctl_map usbmix_ctl_
.id = USB_ID(0x0db0, 0x543d),
.map = asus_rog_map,
},
+ {
+ /* Sennheiser Communications Headset [PC 8] */
+ .id = USB_ID(0x1395, 0x0025),
+ .map = sennheiser_pc8_map,
+ },
{ 0 } /* terminator */
};
Patches currently in stable-queue which might be from timo.gurr@xxxxxxxxx are
queue-4.4/alsa-usb-audio-add-db-range-mapping-for-sennheiser-communications-headset-pc-8.patch
