This is a note to let you know that I've just added the patch titled
ALSA: usb-audio: Skip volume controls triggers hangup on Dell USB Dock
to the 4.5-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-skip-volume-controls-triggers-hangup-on-dell-usb-dock.patch
and it can be found in the queue-4.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From adcdd0d5a1cb779f6d455ae70882c19c527627a8 Mon Sep 17 00:00:00 2001
From: Kailang Yang <kailang@xxxxxxxxxxx>
Date: Tue, 12 Apr 2016 10:55:03 +0800
Subject: ALSA: usb-audio: Skip volume controls triggers hangup on Dell USB Dock
From: Kailang Yang <kailang@xxxxxxxxxxx>
commit adcdd0d5a1cb779f6d455ae70882c19c527627a8 upstream.
This is Dell usb dock audio workaround.
It was fixed the master volume keep lower.
[Some background: the patch essentially skips the controls of a couple
of FU volumes. Although the firmware exposes the dB and the value
information via the usb descriptor, changing the values (we set the
min volume as default) screws up the device. Although this has been
fixed in the newer firmware, the devices are shipped with the old
firmware, thus we need the workaround in the driver side. -- tiwai]
Signed-off-by: Kailang Yang <kailang@xxxxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/usb/mixer_maps.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
--- a/sound/usb/mixer_maps.c
+++ b/sound/usb/mixer_maps.c
@@ -349,6 +349,16 @@ static struct usbmix_name_map bose_compa
};
/*
+ * 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
+ */
+static const struct usbmix_name_map dell_alc4020_map[] = {
+ { 16, NULL },
+ { 19, NULL },
+ { 0 }
+};
+
+/*
* Control map entries
*/
@@ -431,6 +441,10 @@ static struct usbmix_ctl_map usbmix_ctl_
.map = aureon_51_2_map,
},
{
+ .id = USB_ID(0x0bda, 0x4014),
+ .map = dell_alc4020_map,
+ },
+ {
.id = USB_ID(0x0dba, 0x1000),
.map = mbox1_map,
},
Patches currently in stable-queue which might be from kailang@xxxxxxxxxxx are
queue-4.5/alsa-usb-audio-skip-volume-controls-triggers-hangup-on-dell-usb-dock.patch
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