From: Clemens Ladisch <clemens@ladisch.de>
To: Torstein Hegge <hegge@resisty.net>
Cc: Takashi Iwai <tiwai@suse.de>,
alsa-devel@alsa-project.org, Daniel Mack <zonque@gmail.com>
Subject: Re: [PATCH] ALSA: usb: Work around CM6631 sample rate change bug
Date: Tue, 05 Mar 2013 22:39:55 +0100 [thread overview]
Message-ID: <5136662B.7020301@ladisch.de> (raw)
In-Reply-To: <20130305212423.GC20417@pvv.ntnu.no>
Torstein Hegge wrote:
> On Tue, Mar 05, 2013 at 11:35:35AM +0100, Clemens Ladisch wrote:
>> Torstein Hegge wrote:
>>> On Tue, Mar 05, 2013 at 08:55:03AM +0100, Clemens Ladisch wrote:
>>>> From that driver's .inf file:
>>>>
>>>> %CMUACWO.DeviceDesc%=CMUACWO,USB\VID_0D8C&PID_0301&MI_00
>>>> %CMUACWO.DeviceDesc%=CMUACWO,USB\VID_0D8C&PID_0302&MI_00
>>>> %CMUACWO.DeviceDesc%=CMUACWO,USB\VID_0D8C&PID_0304&MI_00
>>>> %CMUACWO.DeviceDesc%=CMUACWO,USB\VID_0D8C&PID_0305&MI_00
>>>> %CMUACWO.DeviceDesc%=CMUACWO,USB\VID_0D8C&PID_0306&MI_00
>>>> %CMUACWO.DeviceDesc%=CMUACWO,USB\VID_0D8C&PID_0309&MI_00
>>>> %CMUACWO.DeviceDesc%=CMUACWO,USB\VID_0D8C&PID_0310&MI_00
>>>> %CMUACWO.DeviceDesc%=CMUACWO,USB\VID_0D8C&PID_0311&MI_00 ;CM6610A
>>>> %CMUACWO.DeviceDesc%=CMUACWO,USB\VID_0D8C&PID_0312&MI_00 ;CM6620A
>>>> %CMUACWO.DeviceDesc%=CMUACWO,USB\VID_0D8C&PID_0313&MI_00 ;CM6630A
>>>> %CMUACWO.DeviceDesc%=CMUACWO,USB\VID_0D8C&PID_0314&MI_00 ;CM6631A
>>>> %CMUACWO.DeviceDesc%=CMUACWO,USB\VID_0D8C&PID_0319&MI_00 ;CM6631A
>>>> %CMUACWO.DeviceDesc%=CMUACWO,USB\VID_0D8C&PID_0315&MI_00 ;CM6632A
>>>> %CMUACWO.DeviceDesc%=CMUACWO,USB\VID_200C&PID_1030&MI_00
>>>> %CMUACWO.DeviceDesc%=CMUACWO,USB\VID_054C&PID_06CF&MI_00
>>>
>>> I'm not quite sure how to interpret that. I guess most of those are
>>> similar devices that doesn't necessarily need this workaround?
>>
>> Those are all the IDs that the C-Media driver attaches to. The
>> hardware is always the same; I would be surprised if the firmware
>> did not have the same bug.
>
> The ids listed covers CM6610, CM6620 and CM6631, which are distinct
> pieces of hardware, or at least they are sold as if they were.
All the same chip with different labels. I don't know if C-Media even
bothers to fuse off the unused features in the lower models.
> It might be a fair assumption that all current C-Media UAC V2.0 devices
> have this issue.
Indeed. In any case, re-setting the interface should not hurt *any*
compliant device.
Regards,
Clemens
next prev parent reply other threads:[~2013-03-05 21:41 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-02 13:04 [PATCH] ALSA: usb: Work around CM6631 sample rate change bug Torstein Hegge
2013-03-02 13:12 ` Daniel Mack
2013-03-03 19:29 ` Torstein Hegge
2013-03-04 8:53 ` Takashi Iwai
2013-03-04 10:31 ` Clemens Ladisch
2013-03-04 21:33 ` Torstein Hegge
2013-03-05 7:55 ` Clemens Ladisch
2013-03-05 10:22 ` Torstein Hegge
2013-03-05 10:35 ` Clemens Ladisch
2013-03-05 21:24 ` Torstein Hegge
2013-03-05 21:39 ` Clemens Ladisch [this message]
2013-03-04 21:29 ` Torstein Hegge
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