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

[Alexey Fisher]

Am 08.11.2011 13:11, schrieb Takashi Iwai:
> At Tue, 08 Nov 2011 12:25:06 +0100,
> Alexey Fisher wrote:
>>
>> 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
>> 046d:09a4.
>>
>> 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")) {
>>                           snd_printk(KERN_INFO
>>                                   "set resolution quirk: cval->res = 384\n");
>>                           cval->res = 384;
>>                   }
>>                   break;
>
> OK, so _what_ is actually broken?  Do you see the message but
> cval->res is overridden later?

yes.