[3.5.y.z extended stable] Patch "ALSA: usb-audio: work around KEF X300A firmware bug" has been added to staging queue
Luis Henriques
luis.henriques at canonical.com
Wed Feb 26 13:25:10 UTC 2014
This is a note to let you know that I have just added a patch titled
ALSA: usb-audio: work around KEF X300A firmware bug
to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree
which can be found at:
http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue
If you, or anyone else, feels it should not be added to this tree, please
reply to this email.
For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable
Thanks.
-Luis
------
>From 9d631d7b27deaeacea1742771c0325091c22efd0 Mon Sep 17 00:00:00 2001
From: Clemens Ladisch <clemens at ladisch.de>
Date: Sun, 16 Feb 2014 17:11:10 +0100
Subject: ALSA: usb-audio: work around KEF X300A firmware bug
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 at ladisch.de>
Signed-off-by: Takashi Iwai <tiwai at suse.de>
[ luis: backported to 3.5: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
sound/usb/mixer_maps.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/sound/usb/mixer_maps.c b/sound/usb/mixer_maps.c
index e71fe55..2dafe18 100644
--- a/sound/usb/mixer_maps.c
+++ b/sound/usb/mixer_maps.c
@@ -313,6 +313,11 @@ static struct usbmix_name_map hercules_usb51_map[] = {
{ 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
*/
@@ -392,6 +397,10 @@ static struct usbmix_ctl_map usbmix_ctl_maps[] = {
.id = USB_ID(0x200c, 0x1018),
.map = ebox44_map,
},
+ {
+ .id = USB_ID(0x27ac, 0x1000),
+ .map = kef_x300a_map,
+ },
{ 0 } /* terminator */
};
--
1.9.0
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