Commit a5c7d797 authored Jun 23, 2010 by Alexey Fisher Committed by Takashi Iwai Jun 23, 2010

ALSA: usb-audio - Add volume resolution quirk for some Logitech webcams

Some programs like Skype trying to set capture volume automatically.
Normally it will tray, carefully step by step lover or higher, set the volume.
In real word it work not really well, because devises and vendors lie about
real audio settings.
For example most Logitech webcams have 6400 or 3500 steps for capture volume.
They do not tell that actual resolution is 384. So we have only 7 or 18 real
steps. In this patch I set real resolution only for tested devices.

Signed-off-by: Alexey Fisher <bug-track@fisher-privat.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

parent 272cbc98

sound/usb/mixer.c

+13 −0

Original line number	Diff line number	Diff line
		@@ -1107,6 +1107,19 @@ static void build_feature_ctl(struct mixer_build state, void raw_desc,
		}
		break;

		case USB_ID(0x046d, 0x0809):
		case USB_ID(0x046d, 0x0991):
		/* Most audio usb devices lie about volume resolution.
		* Most Logitech webcams have res = 384.
		* Proboly there is some logitech magic behind this number --fishor
		*/
		if (!strcmp(kctl->id.name, "Mic Capture Volume")) {
		snd_printk(KERN_INFO
		"set resolution quirk: cval->res = 384\n");
		cval->res = 384;
		}
		break;

		}

		snd_printdd(KERN_INFO "[%d] FU [%s] ch = %d, val = %d/%d/%d\n",

Admin message