At Sun, 07 Oct 2012 23:27:43 +0200, Daniel Mack wrote: > > (cc alsa-devel) > > On 07.10.2012 21:34, Helge Hafting wrote: > > My sound setup works fine with 3.5.4, but have serious problems with 3.6.0 > > > > It is sound through jack that breaks, simply using "aplay" directly with the > > alsa device works. > > > > When I use jack, my setup works fine with 3.5.4. But boot into 3.6.0, > > and I get badly distorted sound as if using an extremely overdone reverb > > effect. > > And jack reports tons of xruns, several per second. > > > > This can be worked around by going from 256 to 512 frames/period in the jack > > settings. But that also double the latency, which makes keyboard playing > > less > > pleasant. > > > > It is not a case of 256 frames/period being (almost) too extreme for the > > machine. With kernel 3.5.4, > > I can use 128 frames/period and get mostly ok sound, with only an > > occational > > xrun (and a correseponding pop in the sound). So I use 256 because that's > > solid. > > But with 3.6.0, not even 256 is enough. And it is not an occational pop, but > > awful distortion all the time. > > > > I don't really know what has changed from 3.5.4 to 3.6.0. The hd-audio > > driver? > > Something in alsa? Or the scheduling? > > > > Machine: Dell precision M6600 laptop, 8GB, 2.2GHz quad-core i7. > > Usually at 800MHz to save power, this is enough for making sound. > > Kernels: 64-bit 3.5.4 or 3.6.0 > > Distro: funtoo > > > > Audio according to lspci: > > 00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family > > High Definition Audio Controller (rev 04) > > > > Please tell if there is anything I should try. I can test other kernel > > versions > > or try patches.
This sounds like a known issue that has been fixed for 3.7-rc1. As a workaround, try to pass position_fix=2 option to snd-hda-intel module. Takashi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
