This message appears to be coming from sound/usb/pcm.c: retire_playback_urb()
/*
* Report when delay estimate is off by more than 2ms.
* The error should be lower than 2ms since the estimate relies
* on two reads of a counter updated every ms.
*/
if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n",
est_delay, subs->last_delay);
I think it is a totally useless message to repeat constantly and can be
rate limited. Its also likely a function of your USB device firmware.
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https://bugs.launchpad.net/bugs/1305133
Title:
usb headset causes "delay: estimated / actual" spam in dmesg
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