sound skipping regression introduced in 2.6.30-rc8

[David Miller]

This change:

commit c87d9732004b3f8fd82d729f12ccfb96c0df279e
Author: Takashi Iwai <tiwai@xxxxxxx>
Date:   Wed May 27 10:53:33 2009 +0200

    ALSA: Enable PCM hw_ptr_jiffies check only in xrun_debug mode
    
    The PCM hw_ptr jiffies check results sometimes in problems when a
    hardware doesn't give smooth hw_ptr updates.  So far, au88x0 and some
    other drivers appear not working due to this strict check.
    However, this check is a nice debug tool, and the capability should be
    still kept.
    
    Hence, we disable this check now as default unless the user enables it
    by setting the xrun_debug mode to the specific stream via a proc file.
    
    Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>

causes sound to skip while listing to MP3s using mplayer on
intel8x0 sound cards.
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