[alsa-devel] A plea for help on mixer support for Fast Track Ultra (8R)

[Grant Diffey]

So something is very whacky with the control map. not sure how to debug
this.

The original patch felix posted works as I expect this one doesn't where
should I start debugging this?

Grant.


On Sat, May 21, 2011 at 1:08 AM, Grant Diffey <gdiffey at gmail.com> wrote:

> so this works.. (ie compiles and I get controls that do change volumes of
> things )
>
> I think there's something whacky with the control map. (I can't seem to
> send Ain5 to out 1 and 2 successfully. but I'll test this with felix's
> original code.
>
> The Ain's are not capture volumes for this device.
>
> There's 8 "analog ins" and 8 "software returns" (pcm channels) that are
> mixed to 8 outputs. all the input gain controls are physical or line +4db
> level balanced
>
> Grant.
>
>
>
> On Fri, May 20, 2011 at 9:37 PM, Daniel Mack <zonque at gmail.com> wrote:
>
>> On Fri, May 20, 2011 at 1:14 PM, Felix Homann <linuxaudio at showlabor.de>
>> wrote:
>> > Sorry, here are the first lines:
>> >
>> > [ 4104.510080] usb 1-3: new high speed USB device using ehci_hcd and
>> address
>> > 2
>> > [ 4104.661745] usb 1-3: config 1 interface 3 altsetting 0 bulk endpoint
>> 0x7
>> > has invalid maxpacket 8
>> > [ 4104.661750] usb 1-3: config 1 interface 3 altsetting 0 bulk endpoint
>> 0x87
>> > has invalid maxpacket 8
>> > [ 4104.824137] BUG: unable to handle kernel NULL pointer dereference at
>> > 0000000000000020
>> > [ 4104.824147] IP: [<ffffffffa04b0119>]
>> snd_usb_mixer_controls+0x49/0x1a0
>> > [snd_usb_audio]
>>
>> Ok, chip->ctrl_intf needs to be initialized. Next try ...
>>
>>
>> Daniel
>>
>
>