On Mon, 8 Oct 2012, Sarah Sharp wrote: > Some USB 3.0 devices signal that they don't implement Link PM by having > all zeroes in the U1/U2 exit latencies in their SuperSpeed BOS > descriptor. Don found that a Western Digital device he has experiences > transfer errors when LPM is enabled. The lsusb shows the U1/U2 exit > latencies are set to zero: Although this helps with Don's device, do you think there might be other devices that really do have very short exit latencies and therefore set the descriptor values to 0? (For U1 at least; maybe not U2.) In principle these would be the devices best suited to use LPM, and yet this patch prevents it. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
