From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris J Arges Subject: Re: Regression in kernel 3.19-rc5 for usb2 scarlett 18i20 Date: Mon, 26 Jan 2015 08:30:14 -0600 Message-ID: <54C64F76.4010904@canonical.com> References: <1422186142.4719.8.camel@yoda.heavyware> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from youngberry.canonical.com (youngberry.canonical.com [91.189.89.112]) by alsa0.perex.cz (Postfix) with ESMTP id 8B74F2605D7 for ; Mon, 26 Jan 2015 15:30:14 +0100 (CET) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org To: Guido Aulisi , Takashi Iwai Cc: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org On 01/26/2015 07:28 AM, Guido Aulisi wrote: > I will ASAP, now I'm not at home. > IMHO I think this is something about usb than the mixer, > because I didn't use it, I only noticed the xruns even without playing audio. > I didn't try 3.18, because it isn't shipped with fedora yet. > > Ciao > > 2015-01-26 14:04 GMT+01:00 Takashi Iwai : >> At Sun, 25 Jan 2015 12:42:22 +0100, >> Guido Aulisi wrote: >>> >>> Hi, >>> I noticed a regression in 3.19-rc5 kernel (as shipped by fedora rawhide) >>> with usb2 focusrite scarlett 18i20. >>> I get a lot of xruns with jack, even at 1024 frame buffer and 2 periods. >>> In 3.17.8 it works quite well without xruns at the same settings. >>> Guido, Takashi, I tried to reproduce this and failed on my Scarlett 18i8 (I don't have any other hardware). I've just tested Ubuntu's 3.18.2 and daily mainline 3.19-r5 as follows: 1) Setup Scarlett 18i8 w/ jack (RT, 1024 frames/period, sample rate 48k, periods/buffer 2). 2) Launch Ardour3 and create/arm 8 tracks 3) Hit record Using this I was unable to see any XRuns even when using Scarlett's mixer with alsamixer in the background on 3.19. Let me know more details. Thanks, --chris j arges >>> I use a fedora 20 (64bit) laptop with 8GB ram, I only installed the >>> rawhide kernel to try the new included scarlett mixer, no other software >>> components changed. >>> >>> I can try to do some other test, but compiling the kernel on this laptop >>> is time consuming. >>> >>> Thanks >>> Guido >> >> Looks like a regression in the recent rework for Scarlett devices. >> Chris, do you have any clue? >> >> In anyway, Guido, could you give lsusb -v output (for the relevant >> part)? >> >> >> thanks, >> >> Takashi >