[alsa-devel] Regression in sound/usb/

Daniel Mack zonque at gmail.com
Thu Jul 12 01:10:39 CEST 2012

On 11.07.2012 09:30, Philipp Dreimann wrote:

> The camera is now working for a short time:
> [   56.421399] usb 2-1.2: new high-speed USB device number 4 using ehci_hcd
> [   57.224234] uvcvideo: Found UVC 1.00 device <unnamed> (046d:0821)
> [   57.237221] input: UVC Camera (046d:0821) as
> /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.2/input/input15
> Camera and microphone are working. Some time later we're back to the old issue:

So I found the reason for this breakage now. It's about orphaned packets
that are sent over the wire after alt setting 0 has been selected. The
chipset doesn't like these at and bails out with protocol errors. Fixing
this involves some rework of the logic. The patch is unfortunately a
little big, but I see no option than getting it merged for 3.6.

Everyone, please test - and sorry for the trouble caused.

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