At Thu, 18 Jul 2013 10:16:29 -0500, Chris J Arges wrote:
On 07/17/2013 06:53 PM, Torstein Hegge wrote:
On Wed, Jul 17, 2013 at 16:12:12 -0500, Chris J Arges wrote:
This patch is similar to commit 1762a59d8e8b5e99f6f4a0f292b40f3cacb108ba. The same non-standard interface descriptor causes snd_usb_create_mixer() to fail for the Focusrite Scarlett 18i8 as well.
Did you test this on a recent kernel? I don't think this quirk or the quirk introduced by 1762a59d "ALSA: usb-audio: Add quirk for Focusrite Scarlett 18i6" is necessary since kernel 3.9, as it includes:
4d7b86c98 "ALSA: snd-usb: mixer: propagate errors up the call chain" 83ea5d18d "ALSA: snd-usb: mixer: ignore -EINVAL in snd_usb_mixer_controls()" 61ac51301 "ALSA: usb: Parse UAC2 extension unit like for UAC1"
Those were tested on a Focusrite Scarlett 8i6, but the lsusb output from 18i6 and 8i6 looks similar, http://www.mail-archive.com/alsa-user@lists.sourceforge.net/msg29426.html http://www.mail-archive.com/alsa-user@lists.sourceforge.net/msg27776.html I'm guessing the 18i8 isn't that different.
Re-testing this, I see that you are right. The mixer still doesn't work, but at least its usable for playback/recording/midi. Ignore this patch then.
OK, thanks for a quick update.
Takashi