chill wrote: > Looking back over this thread I gather you've tried toggling the power > to the USB port, but that didn't change anything. There are a couple of > things that don't seem to fit any kind of theory. > > Firstly, powering off the USB port then re-powering it seems like it > should be no different from physically removing it, but evidently > they're not the same. > Secondly, the dmesg files that you posted earlier show that in the 'no > sound' case (presumably a normal boot) there's already a ~9 second gap > between the hardware being detected and the driver loading. I wonder > what was happening in those 9 seconds. In the 'sound' case that gap is > only ~0.2 seconds. > > I had thought about delaying the audio driver during boot via a udev > rule, but couldn't think of a way to make that work, since udev rules > don't seem to trigger during boot. And anyway, the timing doesn't seem > to be the problem. But it might be worth a try anyway, and I think in > combination with uhubctl it might be possible to interrupt the process > with a udev rule (since you could run uhubctl once boot-up is > complete). > > Would you mind providing a single complete dmesg log from the following > scenario: > 1) Boot normally with the DAC connected. This presumably will result in > 'no sound' > 2) Once booted, use uhubctl to turn off the USB port power, then again > to re-power it. Presumably this will still result in 'no sound', but it > would be interesting to see what's going on in dmesg in this case, and > it would confirm whether a udev rule can be applied to experiment with > timing.
Experiments gave interesting results. On first attempt re-powering USB led to 'sound', so worked as re-plugging. Second attempt gave initial situation - 'no sound'. The difference in dmesg log: [ 95.568629] USB 1-1.3: CANNOT SUBMIT URB (ERR = -19) 33474 33475 +-------------------------------------------------------------------+ |Filename: no-sound2.txt | |Download: http://forums.slimdevices.com/attachment.php?attachmentid=33475| +-------------------------------------------------------------------+ ------------------------------------------------------------------------ bigq's Profile: http://forums.slimdevices.com/member.php?userid=71375 View this thread: http://forums.slimdevices.com/showthread.php?t=113895 _______________________________________________ unix mailing list unix@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/unix
