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Commit d70a1b98 authored by Jiri Jaburek's avatar Jiri Jaburek Committed by Takashi Iwai
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ALSA: usb-audio: extend KEF X300A FU 10 tweak to Arcam rPAC 



The Arcam rPAC seems to have the same problem - whenever anything
(alsamixer, udevd, 3.9+ kernel from 60af3d03, ..) attempts to
access mixer / control interface of the card, the firmware "locks up"
the entire device, resulting in
  SNDRV_PCM_IOCTL_HW_PARAMS failed (-5): Input/output error
from alsa-lib.

Other operating systems can somehow read the mixer (there seems to be
playback volume/mute), but any manipulation is ignored by the device
(which has hardware volume controls).

Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarJiri Jaburek <jjaburek@redhat.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 506b62c3

sound/usb/mixer_maps.c

+12 −3
Original line number Diff line number Diff line
@@ -333,8 +333,11 @@ 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 */

/* some (all?) SCMS USB3318 devices are affected by a firmware lock up

 * when anything attempts to access FU 10 (control)

 */

static const struct usbmix_name_map scms_usb3318_map[] = {

	{ 10, NULL },

	{ 0 }

};
@@ -434,8 +437,14 @@ static struct usbmix_ctl_map usbmix_ctl_maps[] = { 
		.map = ebox44_map,

	},

	{

		/* KEF X300A */

		.id = USB_ID(0x27ac, 0x1000),

		.map = kef_x300a_map,

		.map = scms_usb3318_map,

	},

	{

		/* Arcam rPAC */

		.id = USB_ID(0x25c4, 0x0003),

		.map = scms_usb3318_map,

	},

	{ 0 } /* terminator */

};