On Mon, Jan 13, 2020 at 9:40 AM Oliver Neukum <oneukum@xxxxxxxx> wrote: > > Am Sonntag, den 12.01.2020, 12:06 +0000 schrieb Richard Dodd: > > Hello > > > > I've got a Novation midi-over-usb device (LaunchControl XL) that works > > correctly on boot, but remains in power-off mode when waking from > > sleep. > > > > I suspect that there is some sort of initialisation that needs to be > > applied. Could anyone suggest possible causes, or point me in the > > direction of the relevant source code. I found `sound/usb/quirks.c`, > > which seems to be the place to handle this kind of thing, but there is > > no mention of my device anywhere in the source tree at present > > (1235:0061). > > Hi, > > some devices need an additional reset. They have the quirk RESET_RESUME > in that file. Try adding your device to that list and recompile your > kernel. > > HTH > Oliver > Hi I found the list you are talking about in `drivers/usb/core/quirks.c`, and when I patched it, my device correctly woke up after suspend. :) Can I upstream the patch by posting it here. The patch is attached to this email. Thanks Rich
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