Hi,
thanks for the information. I just commented the following part of mixer.c
if (hdr->bLength < 7 || !csize || hdr->bLength < 7 + csize) {
snd_printk(KERN_ERR "usbaudio: unit %u: invalid
UAC_FEATURE_UNIT descriptor\n", unitid);
return -EINVAL;
}
and compiled alsa-driver, alsa-lib, alsa-tools and alsa-oss basically
following the instructions here:
http://alsa.opensrc.org/Quick_Install. There were warnings during the
compiling process but no errors.
The new driver might work, I have the following output from dmesg
[ 41.064090] usb 1-2: new high-speed USB device number 5 using ehci_hcd
[ 41.200270] ALSA mixer.c:352 cannot get ctl value: req = 0x83,
wValue = 0x200, wIndex = 0x200, type = 4
[ 41.201129] ALSA mixer.c:352 cannot get ctl value: req = 0x83,
wValue = 0x200, wIndex = 0x200, type = 4
[ 41.201230] ALSA mixer.c:352 cannot get ctl value: req = 0x83,
wValue = 0x200, wIndex = 0x200, type = 4
and from aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 1: AD198x Digital [AD198x Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: F23455936 [Fireface UCX (23455936)], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0
The fireface ucx moreover appears in the system settings / sound
menue. I did not test whether the device actually produces sound, I
hope I can do that tomorrow.
I have one more question concerning the usb-audio-2.0 standard:
How many in/out channels am I able to run (on linux) ? RME claim on
their website, that it is possible to use 8 in-channels on the ipad,
i.e. using the class compliance mode. I am asking this question
because JACK seems to have a problem with the in/out channels:
02:12:01.744 D-BUS: SetParameterValue('driver:inchannels', '1'):
Parameter value type mismatch: was expecting 'i', got 'u'.
(org.jackaudio.Error.InvalidArgs)
The same error occurs for the outchannels and I tried the values 1,2,8
for the nummer of channels but I always get the same error.
Best,
Florian
Quoting Daniel Mack <zon...@gmail.com>:
> On 02.10.2012 09:27, Clemens Ladisch wrote:
>> Florian Hanisch wrote:
>>>>> usbaudio: unit 2: invalid UAC_FEATURE_UNIT descriptor
>>>
>>> AudioControl Interface Descriptor:
>>> bLength 10
>>> bDescriptorType 36
>>> bDescriptorSubtype 6 (FEATURE_UNIT)
>>> bUnitID 2
>>> bSourceID 3
>>> bmaControls( 0) 0x0000000c
>>> Volume Control (read/write)
>>> iFeature 0
>>
>> This descriptor is perfectly OK; the driver has a bug.
>> The following code in parse_audio_feature_unit() in sound/usb/mixer.c
>> is valid only for v1 devices; please try to just remove it:
>>
>> if (hdr->bLength < 7 || !csize || hdr->bLength < 7 + csize) {
>> snd_printk(KERN_ERR "usbaudio: unit %u: invalid
>> UAC_FEATURE_UNIT
>> descriptor\n", unitid);
>> return -EINVAL;
>> }
>
> Yes, interesting this never got triggered before. The 7 should be a 6 in
> v2 case ...
>
>
>
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