From: Felix Homann <linuxaudio@showlabor.de>
To: Daniel Mack <daniel@caiaq.de>
Cc: tiwai@suse.de, alsa-devel@alsa-project.org,
Clemens Ladisch <clemens@ladisch.de>
Subject: Re: Need expert's advice - Fast Track Ultra (8R) dropping samples
Date: Thu, 07 Oct 2010 13:35:19 +0200 [thread overview]
Message-ID: <4CADB077.3060907@showlabor.de> (raw)
In-Reply-To: <20101007081010.GZ7159@buzzloop.caiaq.de>
Am 07.10.2010 10:10, schrieb Daniel Mack:
>
> Ah, that makes sense, yes. UAC2 calls this mode "implicit feedback".
> Felix, can you provide a dump of "lsusb -v" for this device?
>
> Daniel
>
>
A couple of additional notes:
1.
If I force the playback endpoint to async mode (.ep_attr = 0x05) the
regular clicks disappear at 48 kHz. But then we are back to completely
distorted playback at 44.1 kHz.
I guess those of you understanding "implicit feedback" probably expected
this result.
2.
In Windows switching the clock source from internal to external gives
these Co packets in usbmon:
ffff88007426a980 49576636 S Co:1:009:0 s 01 0b 0000 0001 0000 0
ffff88007426a980 49577887 C Co:1:009:0 0 0
ffff88007426ab00 49650954 S Co:1:009:0 s 01 0b 0000 0002 0000 0
ffff88007426ab00 49652256 C Co:1:009:0 0 0
ffff88007426a8c0 49789965 S Co:1:009:0 s 01 0b 0001 0001 0000 0
ffff88007426a8c0 49790233 C Co:1:009:0 0 0
ffff88007426a8c0 49808331 S Co:1:009:0 s 01 0b 0002 0002 0000 0 <----
here's a difference
ffff88007426a8c0 49808727 C Co:1:009:0 0 0
ffff88007426aa40 49947450 S Co:1:009:0 s 22 01 0100 0001 0003 3 = 80bb00
ffff88007426aa40 49947823 C Co:1:009:0 0 3 >
ffff88007426aa40 49962321 S Co:1:009:0 s 22 01 0100 0081 0003 3 = 80bb00
ffff88007426aa40 49962691 C Co:1:009:0 0 3 >
The device seems to accept an external clock at 48 kHz only.
3.
In Windows switching the clock source from external to internal gives
these Co packets in usbmon:
ffff88007426aec0 97962867 S Co:1:009:0 s 01 0b 0000 0001 0000 0
ffff88007426aec0 97964056 C Co:1:009:0 0 0
ffff88007426ab00 98031831 S Co:1:009:0 s 01 0b 0000 0002 0000 0
ffff88007426ab00 98033165 C Co:1:009:0 0 0
ffff88007426a980 98093945 S Co:1:009:0 s 01 0b 0001 0001 0000 0
ffff88007426a980 98094160 C Co:1:009:0 0 0
ffff88007426a980 98099994 S Co:1:009:0 s 01 0b 0001 0002 0000 0 <----
here's a difference
ffff88007426a980 98101277 C Co:1:009:0 0 0
@Daniel:
You asked for the output of lsusb. Are you thinking of modifying the
UA-101 driver yourself? Or something more generic? In other words, if
you already have an idea of a solution I wouldn't have to work myself
through ua101.c (which I don't understand right now).
@all:
Did anyone notice the patch adding mixer support for the FTU devices I
send on Sept, 25?
Kind regards,
Felix
next prev parent reply other threads:[~2010-10-07 11:35 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-25 9:57 Need expert's advice - Fast Track Ultra (8R) dropping samples Felix Homann
2010-10-01 11:00 ` Felix Homann
2010-10-01 16:29 ` Clemens Ladisch
2010-10-03 11:50 ` Felix Homann
2010-10-03 12:00 ` Daniel Mack
2010-10-05 7:21 ` Clemens Ladisch
2010-10-06 13:57 ` Felix Homann
2010-10-06 14:38 ` Clemens Ladisch
2010-10-06 16:31 ` Felix Homann
2010-10-07 6:37 ` Clemens Ladisch
2010-10-07 8:10 ` Daniel Mack
2010-10-07 8:50 ` Felix Homann
2010-10-07 11:35 ` Felix Homann [this message]
2010-10-08 6:26 ` Clemens Ladisch
2010-10-12 7:18 ` Daniel Mack
2010-10-12 8:18 ` Felix Homann
2010-10-12 10:26 ` Daniel Mack
2010-10-13 7:47 ` Felix Homann
2010-10-13 12:48 ` Daniel Mack
2010-10-15 7:23 ` Clemens Ladisch
2010-10-15 8:59 ` Daniel Mack
2010-10-15 11:08 ` Felix Homann
2010-10-15 14:21 ` Clemens Ladisch
2010-10-03 10:02 ` Daniel Mack
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