[alsa-devel] [regression] probably in mixer.c code

Alexey Fisher bug-track at fisher-privat.net
Tue Nov 8 12:25:06 CET 2011

Am 08.11.2011 10:59, schrieb Takashi Iwai:
> At Tue, 08 Nov 2011 09:49:13 +0100,
> Alexey Fisher wrote:
>> Hallo all, Takashi,
>> there is one regression in current linux main tree:
>> cval->res quirks do not work any more. See usb/mixer.c:1150
>> Are there was some work in this area or may be some one bisected this
>> bug down?
> Are you referring to the device 046d:09a4, which sets the mixer range
> manually?  If yes, does the patch below work?

No, i referring to devices 046d:0991, 046d:081d, i don't have access to 

This part is broken for me:
         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")) {
                                 "set resolution quirk: cval->res = 384\n");
                         cval->res = 384;

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