Bug#586386: linux-2.6: Please enable CONFIG_SND_PCM_XRUN_DEBUG

[Moritz Muehlenhoff <jmm@inutil.org>]

On Fri, Jun 18, 2010 at 10:03:07PM -0400, Frédéric Brière wrote:
> Source: linux-2.6
> Severity: wishlist
> 
> While CONFIG_SND_PCM_XRUN_DEBUG is mostly used for debugging purposes,
> it can also affect the behavior of snd_pcm_update_hw_ptr0() since commit
> c87d973.  (See XRUN_DEBUG_JIFFIESCHECK in sound/core/pcm_lib.c.)
> 
> This has been used before to work around bugs in intel8x0[1] and
> cmipci[2], which have now been (mostly) fixed.  However, my own sound
> card will still not play correctly without this hack[3].  It would be
> nice not to have to recompile the kernel just to enable this option.
> 
> Note that CONFIG_SND_PCM_XRUN_DEBUG itself only creates a procfile; no
> other effects will be felt until specific values are written to that
> procfile.  It can thus be safely enabled, and will only bloat up the
> kernel a little bit.  (Then, people like me who need this hack can
> manually write XRUN_DEBUG_JIFFIESCHECK to the procfile.)

Enabling this option would require to also compile in the whole ALSA
debugging support, this I don't think this suitable for the standard
Debian kernel.

Cheers,
        Moritz