The patch is working, after re-plugging it to previous USB messages
stopped appearing.
I think I know why it is consuming CPU. Pulseaudio is constantly
"listening" from the plugged-in line input; it consumes even more CPU
cycles.
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But they've stopped appearing with such a frequency.
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https://bugs.launchpad.net/bugs/1319457
Title:
usb headset causes "retire_playback_urb ... callbacks suppressed" spam
After plugging the device into USB 2.0 socket (nVidia chip) syslog
messages re-appeared:
[ 191.028275] retire_capture_urb: 29 callbacks suppressed
[ 214.789697] retire_capture_urb: 2 callbacks suppressed
[ 249.805552] retire_capture_urb: 11 callbacks suppressed
[ 254.804116] retire_capture_ur
However:
Sound card is eating about 5% of one CPU core:
Line from top:
93 root -51 0 0 0 0 S 4,6 0,0 2:44.19
irq/16-
Fragment of /proc/interrupts
Is it normal for USB sound devices to generate such load?
CPU0 CPU1 CPU2 CPU3
0:
Installing kernel 3.13.0-31.55 has fixed this issue in my case!
CPU: AMD Phenom 9650 Quad-Core
Sound device: i-tec ( C-Media Electronics, Inc. CM106 Like Sound Device )
Sound device chip: C-Media CM6206
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