ALSA: usb-audio: work around KEF X300A firmware bug (624aef49) · Commits · 戴 / test

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> Signed-off-by:

Takashi Iwai <tiwai@suse.de>

sound/usb/mixer_maps.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -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 */
		};

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