On 12.09.2012 02:37, chris hermansen wrote:
> The build and install appeared to work just fine, though it seems one
> no longer needs to run the "update-initramfs" nor "update-grub" as
> they are executed by the dpkg on the image file.
>
> The system rebooted fine, and according to uname -a I am now running
>
> 3.6.0-rc3-custom #1 SMP Tue Sep 11 10:02:55 PDT 2012 i686 athlon i686 GNU/Linux[
>
> which seems about right.
>
> Finally, just to check that the patch is really there:
>
> clh@nice:~/src/sound$ grep -i schiit sound/usb/quirks.c
> case USB_ID(0x0d8c, 0x0304): /* CMEDIA - Schiit USB Interface */
>
> so that looks ok too.
Yes, well done :)
> So - all good, I guess! Except that the !@)#!#*&$ thing still doesn't work:
>
> using Guayadeque 3.5- with the output device set to hw:1,0 which is my
> Schiit Bifrost
>
> If I start by playing a 44.1 16bit file, I get great sound. If I then
> switch to a 192 24bit file, I can hear the elements of the melody but
> the instruments all sound completely unlike they are supposed to - a
> sort of tinny, grinding character.
>
> If I then stop and restart the 192 24bit file, most of the time it
> soulnds just fine.
>
> Same problem occurs now when I switch back to a 44.1 16 bit file.
>
> Looking at the /proc/asound/card1/stream0 file, when the 192k 24bit
> file is playing poorly, it looks like this:
>
> CMEDIA Schiit USB Interface at usb-0000:00:13.5-5, high speed : USB Audio
>
> Playback:
> Status: Running
> Interface = 1
> Altset = 2
> Packet Size = 208
> Momentary freq = 176426 Hz (0x16.0da0)
> Feedback Format = 10.14
^^^^^
> Packet Size = 0
> Momentary freq = 192000 Hz (0x18.0000)
> Interface 1
> Altset 1
> Format: S16_LE
> Channels: 2
> Endpoint: 5 OUT (ASYNC)
> Rates: 44100, 48000, 88200, 96000, 192000
> Data packet interval: 125 us
> Interface 1
> Altset 2
> Format: S32_LE
> Channels: 2
> Endpoint: 5 OUT (ASYNC)
> Rates: 44100, 48000, 88200, 96000, 192000
> Data packet interval: 125 us
>
> (note the momentary frequenccy is closer to 176k than 192k)
>
> Once I stop and restart it, the file looks like:
>
> CMEDIA Schiit USB Interface at usb-0000:00:13.5-5, high speed : USB Audio
>
> Playback:
> Status: Running
> Interface = 1
> Altset = 2
> Packet Size = 208
> Momentary freq = 192027 Hz (0x18.00e0)
> Feedback Format = 8.16
^^^^
> Packet Size = 0
> Momentary freq = 192000 Hz (0x18.0000)
> Interface 1
> Altset 1
> Format: S16_LE
> Channels: 2
> Endpoint: 5 OUT (ASYNC)
> Rates: 44100, 48000, 88200, 96000, 192000
> Data packet interval: 125 us
> Interface 1
> Altset 2
> Format: S32_LE
> Channels: 2
> Endpoint: 5 OUT (ASYNC)
> Rates: 44100, 48000, 88200, 96000, 192000
> Data packet interval: 125 us
>
> Going back the other way, the momentary frequency line first looks like:
>
> Momentary freq = 48007 Hz (0x6.0038)
>
> then after re-start like this:
>
> Momentary freq = 44106 Hz (0x5.8368)
>
Yes, it seems the feedback format detector still assumes wrong things.
What you could try is to make the driver ignore more of these packets by
changing the value in sound/usb/quirks.c (in the line that was added by
the path). Then rebuild, reinstall, reboot and test. Try higher values,
like ep->skip_packets = 50 or so maybe.
If that doesn't help, I need to come up with another idea.
Daniel
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