On Mon, 2 Nov 2015, Steinar H. Gunderson wrote: > On Mon, Nov 02, 2015 at 02:38:41PM -0500, Alan Stern wrote: > >> Note that the two controllers were running different kernels. The one that > >> worked had a kernel before LPM was turned on, I believe. > > Oh. Can you try running a more recent kernel on that computer? Does > > it fail with the same "Not enough bandwidth for altsetting 4" error? > > Unfortunately I cannot easily; it's under someone else's administration. > Perhaps I could find a live USB stick, but I'm not immediately sure if > there's anything out there with e.g. 4.3 yet. You don't need 4.3. Anything released within the last few years will contain the LPM code. > But I did run an older kernel on the computer with the problem (as part of > the bisection that showed LPM to be breaking it), and it worked then. Well yes, we know that that controller works okay when LPM is turned off. The question is whether the other controller needs the same workaround. 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
