[Alsa-user] crack noise with USB on linux 3.x

[Tatsuki S. <su...@ne...>]

Hello all,

Now I try to transit linux 3.x. But I have a problem on alsa.

When I use 3.x, get crack noise on my USB audio randomly.
I tested with 3.0rc, 3.1rc, 3.1.4 and 3.2.5. However all
3.x kernels has this problem. (2.6.x works well.)

My USB audio is Yamaha SE-U33 recognized as 
"Philips (or NXP) Digital Speaker System" on lsusb.

I tried to tune settings;
 * use dmix and tune buffers
 * load snd-usb-audio with nrpacks option (1,10,20)
 * compile kernel with preempt option
 * change kernel timer frequency (250, 300, 1000)
 * trun kernel options off; "USB runtime power management"
   and "Dynamic USB minor allocation".

But nothing changed!

How do I do next to fix this problem?

-- 
Tatsuki Sugiura   mailto:su...@ne...