On Tue, Oct 02, 2012 at 12:15:46PM -0700, Sarah Sharp wrote: > Hi Don, > > The WD drive arrived today, but I can't reproduce your I/O errors on > 3.6. I didn't try with 3.5 yet. However, I did notice that the device > really doesn't want to enter U1, but it will enter U2. I did update the firmware but I think I had the problem before that happened. Also I don't use the VIA hub anymore. I plugged the harddrive directly into my mahobay system's usb3 port and see the problem. > > Can you test the following patch with your device and see if it helps? > If that doesn't work, I suggest getting a high-quality new cable and > seeing if that helps the transfer issues. > > Gabor, this might fix your issues as well, and should allow your system > to consume less power than completely disabling LPM. > > Sarah Sharp > > >8-------------------------------------------------------------8< > > USB 3.0 devices are required to support Link PM. However, some of > them don't support U1, or don't support U2, or don't support either. > There is no way in the USB 3.0 specification to say that a device > doesn't support U1 or U2, so these devices set the U1 or U2 exit > latency to the maximum possible values (10ms for U1, 2047ms for U2). It still failed for me. :-( Cheers, Don -- 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
