Jonathan Nieder wrote: > Some USB MIDI keyboards fail to operate after a USB autosuspend.
Make that *all* USB MIDI devices with input ports. This is not a bug in the device, but one of the many bugs introduced with the autosuspend code in <http://git.kernel.org/linus/88a8516a2128>. That patch does not handle input at all, i.e., when the driver wants to read from the device, it just doesn't take it out of suspend mode. > A workaround is to disable USB autosuspend for these devices by > putting AUTOSUSPEND_USBID_BLACKLIST="0763:2027" (resp. 0763:019b) in > /etc/laptop-mode/conf.d/usb-autosuspend.conf. In the spirit of commit > 166cb70e97bd ("usb: add USB_QUIRK_RESET_RESUME for M-Audio 88es"), > reset the device on resume so this workaround is not needed any more. It is not feasible to add the IDs of all USB MIDI devices. I'm working on a fix that adds proper power management for input ports, but this requires the driver to be reorganized a little ... Regards, Clemens -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
