Re: [PATCH] ALSA: usb-audio: work around KEF X300A firmware bug

Re: [PATCH] ALSA: usb-audio: work around KEF X300A firmware bug

[Patrick Laughlin]

Thank you for the help regarding this bug.

I am not a programmer - could you tell me how to install this fix? Id there a newer version of the firmware you can send me?

Thanks you!

Patrick

Re: [PATCH] ALSA: usb-audio: work around KEF X300A firmware bug

[Clemens Ladisch]

Patrick Laughlin wrote:
> I am not a programmer - could you tell me how to install this fix?

It has been merged into all the relevant stable kernels, so you should
have gotten it with some kernel update from your distribution.

> Id there a newer version of the firmware you can send me?

Ask KEF.  (But I doubt that the firmware is upgradeable.)


Regards,
Clemens

[PATCH] ALSA: usb-audio: work around KEF X300A firmware bug

[Clemens Ladisch]

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.

Cc: <stable@vger.kernel.org>
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
---
 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 32af6b7..d1d72ff 100644
--- a/sound/usb/mixer_maps.c
+++ b/sound/usb/mixer_maps.c
@@ -328,6 +328,11 @@ static struct usbmix_name_map gamecom780_map[] = {
 	{}
 };

+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
  */
@@ -419,6 +424,10 @@ 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 */
 };

Re: [PATCH] ALSA: usb-audio: work around KEF X300A firmware bug

[Takashi Iwai]

At Sun, 16 Feb 2014 17:11:10 +0100,
Clemens Ladisch wrote:
> 
> 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.
> 
> Cc: <stable@vger.kernel.org>
> Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

Thanks, applied.


Takashi

> ---
>  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 32af6b7..d1d72ff 100644
> --- a/sound/usb/mixer_maps.c
> +++ b/sound/usb/mixer_maps.c
> @@ -328,6 +328,11 @@ static struct usbmix_name_map gamecom780_map[] = {
>  	{}
>  };
> 
> +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
>   */
> @@ -419,6 +424,10 @@ 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 */
>  };
>