This is a note to let you know that I've just added the patch titled
ALSA: usb-audio: work around KEF X300A firmware bug
to the 3.4-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-work-around-kef-x300a-firmware-bug.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 624aef494f86ed0c58056361c06347ad62b26806 Mon Sep 17 00:00:00 2001
From: Clemens Ladisch <clemens@xxxxxxxxxx>
Date: Sun, 16 Feb 2014 17:11:10 +0100
Subject: ALSA: usb-audio: work around KEF X300A firmware bug
From: Clemens Ladisch <clemens@xxxxxxxxxx>
commit 624aef494f86ed0c58056361c06347ad62b26806 upstream.
When the driver tries to access Function Unit 10, the KEF X300A
speakers' firmware apparently locks up, making even PCM streaming
impossible. Work around this by ignoring this FU.
Signed-off-by: Clemens Ladisch <clemens@xxxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/usb/mixer_maps.c | 9 +++++++++
1 file changed, 9 insertions(+)
--- a/sound/usb/mixer_maps.c
+++ b/sound/usb/mixer_maps.c
@@ -304,6 +304,11 @@ static struct usbmix_name_map hercules_u
{ 0 } /* terminator */
};
+static const struct usbmix_name_map kef_x300a_map[] = {
+ { 10, NULL }, /* firmware locks up (?) when we try to access this FU */
+ { 0 }
+};
+
/*
* Control map entries
*/
@@ -371,6 +376,10 @@ static struct usbmix_ctl_map usbmix_ctl_
.map = scratch_live_map,
.ignore_ctl_error = 1,
},
+ {
+ .id = USB_ID(0x27ac, 0x1000),
+ .map = kef_x300a_map,
+ },
{ 0 } /* terminator */
};
Patches currently in stable-queue which might be from clemens@xxxxxxxxxx are
queue-3.4/alsa-usb-audio-work-around-kef-x300a-firmware-bug.patch
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