Interesting to hear that it works straight out of the box on 64-bit.
Unfortunately I have no way to test that since I don't have any 64-bit
capable hardware in the house (I know it's hard to believe!).
I've only got a Northwood, a Banias, a Dothan, two Yonahs, and two dual
Sossamans - I guess I'm still in 32-bit land here.
If I do get my hands on some 64-bit hardware (maybe at work) I'll test out
my change, but in the meantime, would someone else be kind enough to verify
that this is indeed not necessary on 64-bit Linux and that my change doesn't
break anything?
Thanks,
---Dan
On Fri, May 22, 2009 at 1:18 AM, gary <li...@lazygranch.com> wrote:
> FWIW, mine worked fine under XP64. That is, I didn't load any drivers. The
> last time I messed with this on Suse 11.1 (also 64 bit), I managed to get
> some distorted audio.
>
> I'd like to get this USB card working eventually, but for expediency, I
> used several Diamond XS71 PCI cards in a PCI expander. For one application,
> I need to get the sound card in 8 bit mode, which I'm not sure can be done
> with the USB device.
>
>
> Dan Allongo wrote:
>
>> Hi all.
>>
>> I just got this chip off of e-bay like the rest of you and was
>> disappointed to find that it's not working.
>> Well, it's now been a couple hours of reading the ALSA wiki and figuring
>> out where to look in the source code, but I've finally got this chip working
>> in .20 under Debian.
>>
>> After sniffing USB data with Wireshark on a VirtualBox instance of WinXP,
>> I noticed that config data was being sent from the host shortly after device
>> enumeration.
>> This makes sense since it didn't work in Windows either until I installed
>> the driver (so much for following USB audio standards?).
>> I can only assume that the drivers contain the default settings for the
>> device to be usable.
>> Why the registers don't look like this on reset is beyond me, but
>> whatever.
>>
>> In usbaudio.c in the snd_usb_audio_probe function (somewhere in the
>> vicinity of line 3500) you need to enable the "boot quirk" for this chip:
>> /* C-Media CM6206 / CM106-Like Sound Device */
>> if (id == USB_ID(0x0d8c, 0x0102)) {
>> if (snd_usb_cm106_boot_quirk(dev) < 0)
>> goto __err_val;
>> }
>>
>>
>> Looks like the chip needs some config parameters sent to it via HID which
>> are already there courtesy of the Turtle Beach hack.
>> The register setup is outlined in the datasheet (I found it here:
>> http://pdf1.alldatasheet.net/datasheet-pdf/view/158787/CMEDIA/CM106-L+.html)
>> on page 21.
>> The key is to set b15 in register 0x02 so that we can get the output.
>>
>> Hope that helps,
>> ---Dan
>>
>>
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