On 05/17/2013 04:03 PM, B. Zhang wrote: > On 05/17/2013 03:04 PM, Torstein Hegge wrote: >> On Fri, May 17, 2013 at 09:16:49 +0200, B. Zhang wrote: >>> I have two alsa-info output for kernel 3.1 and 3.9. Attached. >>> A diff show me : >>> ======= >>> !!Module: snd_usb_audio >>> - async_unlink : Y >>> =========== >>> I found there was a change https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/sound/usb/card.c?id=20d32022a8d8639a33d0e429f2d3c51b527ea362 >>> after kernel 3.4 >>> >>> How you think about this ? >> That isn't related to the pops you are hearing, the commit just removes >> a module parameter, and the module parameter was set to the default >> value. > Yes ! I just made two tests. > - kernel 3.9.2 + "async_unlink", the problem still exists > - kernel 3.5.7, no "pops" noise, and I see "feedback format = 8.16", so > the noises are not caused by it. >> There is quite a bit of changes both in sound/usb and drivers/usb >> between 3.4 and 3.9. You could try to test with a 3.5 kernel and a 3.8 >> kernel to narrow down where the problem is coming from. Testing with 3.6 >> and 3.7 would require that you apply the fix for the "atomic DMA >> coherent pool is too small" issue. > I'll try 3.6 (and 3.7). Maybe it is caused by a drivers/usb change in > kernel 3.6. I tried 3.6.11 and 3.7.10. 3.6.11 OK. 3.7.10 has this noise problem ( buffers management problem? ) with my USB interface. It seems to me that there was a big ALSA updatefrom 3.6 to 3.7. Regards, Bin ------------------------------------------------------------------------------ AlienVault Unified Security Management (USM) platform delivers complete security visibility with the essential security capabilities. Easily and efficiently configure, manage, and operate all of your security controls from a single console and one unified framework. Download a free trial. http://p.sf.net/sfu/alienvault_d2d _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
