From: Clemens Ladisch <clemens@ladisch.de>
To: alsa-devel@alsa-project.org
Subject: Re: Some information about UsbPre2 UAC2 support
Date: Mon, 28 Jan 2013 15:17:01 +0100 [thread overview]
Message-ID: <5106885D.4050508@ladisch.de> (raw)
In-Reply-To: <1565248075.1826245.1359380896039.JavaMail.root@spooler2-g27.priv.proxad.net>
shal@free.fr wrote:
>>> I have to plug/unplug the sound card in order to have 2 configurations
>>> descriptor for this device.
>>
>> That's strange; the get_descriptor request should be the same.
>
> - I used a standard kernel (with 64 as get_descriptor buffer size)
> ...
> - I reboot with modified kernel (with 65 as get_descriptor buffer size)
> ...
> - Now the sound card provides a UAC1+UAC2 configuration
So the modified get_descriptor is stil necessary.
> - I performed a usb_reset()
> - I performed a get_descriptor using a usb_control() with 65 as buffer size
The USB core will already issue the get_descriptor request before
the driver gets informed that the device is there, so this won't
help.
Regards,
Clemens
prev parent reply other threads:[~2013-01-28 14:17 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1897855798.462977802.1359220888088.JavaMail.root@spooler2-g27.priv.proxad.net>
2013-01-26 17:50 ` Some information about UsbPre2 UAC2 support shal
2013-01-26 20:29 ` Clemens Ladisch
2013-01-28 12:43 ` shal
2013-01-28 13:10 ` Clemens Ladisch
2013-01-28 13:48 ` shal
2013-01-28 14:17 ` Clemens Ladisch [this message]
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