Messages in this thread | | | Date | Sat, 22 Jul 2006 18:00:59 +0100 | From | Ian Stirling <> | Subject | Re: [linux-usb-devel] USB snd-usb-audio wedges lsusb when unplugged while playing sound. |
| |
Christopher Montgomery wrote: > On 7/22/06, Ian Stirling <tandra@mauve.plus.com> wrote: > >> Config/... as my earlier message on USB - though with the bandwidth >> enforcement >> turned off so it actually plays sound, when plugged into the USB1 port. >> >> 2.6.17. >> >> Basically - playing sound with >> mplayer -ao alsa:device=hw=1 or whatever - and then unplugging the >> soundcard completely wedges lsusb/usb configuration, until the mplayer >> process is killed. > > > This sounds like the well known EPIPE problem in usb-audio and one I > intended to fix after dealing with the ehci scheduler. <snip> > enough system load on the machine that it may well even stop pinging. > Although the *machine* is not wedged, if this happens in a realtime > thread (eg, jack using a usb-audio device), it may well be hosed > enough to become unrecoverable.
I just did it again, and the machine is >90% idle (PII/300), with mplayer doing:
ioctl(5, 0x806c4120, 0xbffeffd0) = -1 ENODEV (No such device) write(2, "alsa-lib: pcm_hw.c:406:(snd_pcm_"..., 89) = 89 write(2, "alsa-space: cannot get pcm statu"..., 50) = 50 nanosleep({0, 10000000}, NULL) = 0 ioctl(5, 0x806c4120, 0xbffeffd0) = -1 ENODEV (No such device)
about 70 times a second. Of course, with other software, it may be different. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |