The devices support LPM and are USB3.0 certified, and they work fine in Windows using the same Intel 8/9/10 Series USB host controllers, along with Renesas and Fresco controllers. On Linux the devices either seize up or slow down dramatically ever since LPM support was enabled. I could always just build a custom kernel ".deb" package for customers for now, as some of them are migrating from Ubuntu 14.04.3 LTS (kernel 3.19.0-51) to Ubuntu 14.04.4 LTS (kernel 4.2.x) or Ubuntu 16.04 LTS (kernel 4.4.x), but I'd like to avoid that solution. Ideally, disabling LPM on a per-device basis would be better than the solution I proposed, but I'm not familiar enough with the usbcore code to implement such a feature at this time. I'd also prefer customers go with an official kernel release and just add a custom boot parameter. ============================================================ Matthew Giassa, MASc, BASc, EIT Security and Embedded Systems Specialist linkedin: https://ca.linkedin.com/in/giassa e-mail: matthew@xxxxxxxxxx website: www.giassa.net > -------- Original Message -------- > Subject: Re: [PATCH 1/1] usb: lpm: add boot flag to disable lpm > From: Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> > Date: Wed, April 13, 2016 3:11 pm > To: Matthew Giassa <matthew@xxxxxxxxxx> > Cc: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>, > linux-usb@xxxxxxxxxxxxxxx > > > On Wed, Apr 13, 2016 at 02:37:35PM -0700, Matthew Giassa wrote: > > Thank you for the feedback Greg. This is my first attempt to submit a > > kernel patch. > > > > Is there a better approach to this? The only other option at my disposal > > is to add about 200 products to the quirks.c file, and routinely update > > that list as new products are released. I need to implement some means > > of disabling LPM, ideally on a per-device basis. > > Why are these devices say they support LPM yet they do not? > > -- > 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 -- 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
