From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andoru <andoru.blah@gmail.com>
Subject: Re:
	=?utf-8?q?Invalid_PCM_pointer_with_CMI8738_and_pcm?=
	=?utf-8?q?=2Ec_buffer=09underuns?=
Date: Sat, 12 Apr 2014 17:56:12 +0000 (UTC)
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> 
> You need root privilege to debug
> 
> sudo echo 11 > /proc/asound/card0/pcm0p/xrun_debug

___________________________________________________________
$ sudo echo 11 > /proc/asound/card0/pcm0p/xrun_debug
___________________________________________________________

implies:
___________________________________________________________
# echo 11 > /proc/asound/card0/pcm0p/xrun_debug
___________________________________________________________

So I did have root priviledges when I executed that command, and it still
gives me a Permission denied error.

I tried the command under root and it accepted the command but didn't print
anything after issuing the command. So I guess it worked?

> Check the system log , you should find the hwptr change at 10ms interval if
> vlc use period time of 10ms

Again, what system log? Be a little bit more specific please.

> Try different period time/size to verify that the hardware really support
> any  arbitrary period time/size requested by the application ?

VLC doesn't have any options or terminal parameters to be able to change the
period as you mention.