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
