https://bugs.freedesktop.org/show_bug.cgi?id=84585

--- Comment #62 from Raymond <[email protected]> ---
http://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/src?id=4df443bbe682055a41e7c2248877dcc7682a69b8

timer scheduling mode require driver provide accurate hwptr position

if your driver did not provide dB scale, this force pulseaudio to use software
volume

any volume change by user force pulseaudio to perform rewind

the safeguard is 256bytes (i.e. 64 frames)

your result indicate the hwptr may remain unchanged for more than 400 frames



now_us-last_us=164     now_us-start_us=70447     time_us-start_us=70426    
time_us-last_time=164     time_us-start_time=70389     Available: 3416     loop
iteration: 301
now_us-last_us=8858     now_us-start_us=79305     time_us-start_us=79275    
time_us-last_time=8849     time_us-start_time=79238     Available: 3840    
loop iteration: 302
now_us-last_us=258     now_us-start_us=79563     time_us-start_us=79539    
time_us-last_time=264     time_us-start_time=79502     Available: 3852     loop
iteration: 303

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