[alsa-devel] Bug#635362: Realtek ALC889: HDA Intel and kernel 3.0 gives choppy sound

[Julian Sikorski]

W dniu 26.07.2011 23:14, Colomban Wendling pisze:
> Hi,
> 
> Following a bug report started in Debian BTS, in bug 635362 [1], I was
> asked to post here after testing upstream kernels and reproducing the bug.
> 
> So, here's the problem: my HDA audio chip [2] started to output very
> choppy sound with Linux kernel 3.0, while it worked perfectly well in
> previous versions -- latest two I used being 2.6.38 and 2.6.39 from
> Debian. Please note that simply booting on 2.6.39 works as usual, so
> it's IMHO definitely a driver regression.
> 
> I tried Debian's 3.0 as well as mainline 3.0 and git5 snapshots, and all
> 3 were affected by the problem -- though the kernel log isn't exactly
> the same.
> 
> I attach three dmesg outputs, always took after trying to play a sound
> (and hearing it choppy, it happens every time):
> 
> dmesg-3.0.0-mainline: dmesg when running 3.0 mainline
> dmesg-3.0.0-git5: when running 3.0-git5 snapshot
> dmesg-3.0.0-git5-2: same as dmesg-3.0.0-git5 but configured without
> CONFIG_SND_HDA_ENABLE_REALTEK_QUIRKS (doesn't change anything)
> 
> If you want to see dmesg from the 2.6.39 kernel (where sound works well)
> or Debian's 3.0, see respectively [3] and [4].
> 
> 
> Thanks by advance, and if you need any further details or testing,
> please let me know.
> 
> Regards,
> Colomban
> 
> 
> [1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=635362
> [2] Realtek ALC889 on an MSI H55M-E33, see lspci in Debian bug [1] for
> details
> [3]
> http://bugs.debian.org/cgi-bin/bugreport.cgi?msg=15;filename=dmesg-2.6.39-2-amd64;att=1;bug=635362
> [4]
> http://bugs.debian.org/cgi-bin/bugreport.cgi?msg=15;filename=dmesg-3.0.0-1-amd64;att=2;bug=635362
I am probably wrong, but did you try setting CONFIG_SND_HDA_BUFFER_SIZE
to a larger value?

Julian