From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
To: Takashi Iwai <tiwai@suse.de>, Con Kolivas <kernel@kolivas.org>
Cc: saranya.gopal@intel.com, alsa-devel@alsa-project.org,
linux-usb@vger.kernel.org,
linux-kernel <linux-kernel@vger.kernel.org>,
felipe.balbi@linux.intel.com
Subject: Re: [alsa-devel] ALSA:usb audio Higher sample rates on usb audio no longer working.
Date: Fri, 4 Jan 2019 09:23:38 -0600 [thread overview]
Message-ID: <5c7b2c6b-5dcc-7170-f6e1-bf6021bbb72a@linux.intel.com> (raw)
In-Reply-To: <s5hd0pdey4e.wl-tiwai@suse.de>
> [ Adding linux-usb ML to Cc, as it's a core USB issue ]
>
> So the device seems incorrectly advertising as if it were supporting
> UAC3 -- assuming the device is still not UAC3-capable.
>
> IOW, it's a buggy firmware. We need some blacklisting, or revert the
> commit for now, unless any real UAC3 device comes up to the market.
IIRC an UAC3-capable device is required to expose a backwards-compatible
configuration (either UAC1 or UAC2). Maybe an additional test can be
done to harden the detection so that UAC3 is only chosen if indeed a
second audio configuration is present as well.
I also vaguely recall there was talk about adding information in the BOS
descriptor, but I don't know if this was ever published.
-Pierre
next prev parent reply other threads:[~2019-01-04 15:23 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-03 11:43 ALSA:usb audio Higher sample rates on usb audio no longer working Con Kolivas
2019-01-03 13:23 ` Takashi Iwai
2019-01-03 23:16 ` Con Kolivas
2019-01-04 6:27 ` Takashi Iwai
2019-01-04 15:23 ` Pierre-Louis Bossart [this message]
2019-01-04 16:52 ` [alsa-devel] " Gopal, Saranya
2019-01-04 17:13 ` Pierre-Louis Bossart
2019-01-04 20:34 ` Con Kolivas
2019-01-05 14:14 ` Gopal, Saranya
2019-01-05 14:02 ` [PATCH] usbcore: Select only first configuration for non-UAC3 compliant devices saranya.gopal
2019-01-05 14:35 ` Greg KH
2019-01-05 17:39 ` [PATCH V2] " saranya.gopal
2019-01-05 22:02 ` Con Kolivas
2019-01-06 2:44 ` [PATCH V3] " saranya.gopal
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