On Tue, 2013-06-18 at 08:26 +0200, Hans de Goede wrote: > Hi, > > On 06/17/2013 10:37 PM, Adam Williamson wrote: > > On Sun, 2013-06-16 at 22:33 +0100, Matthew Garrett wrote: > >> On Sun, Jun 16, 2013 at 10:11:42PM +0100, David Woodhouse wrote: > >>> On Sun, 2013-06-16 at 05:38 +0100, Matthew Garrett wrote: > >>>> On Sat, Jun 15, 2013 at 08:24:33AM -0700, John Reiser wrote: > >>>>> How can I force the system not to recognize a USB2.0 flash memory > >>>> device at USB1.1 speed? > >>>> > >>>> You can't - it's negotiated at the host controller level, the OS isn't > >>>> involved. > >>> > >>> You can't force it to use USB2 mode when for some reason it's negotiated > >>> something slower. But you can *detect* that it's connected as a USB1 > >>> device and refuse to mount it, surely? And then the user will unplug it > >>> and plug it in again, until it works correctly. > >> > >> Yeah, I guess you could write a udev rule that detected that case and > >> flagged it such that it didn't get automounted. > > > > IIRC, Windows pops up one of its little yellow warnings associated with > > a notification tray icon when this happens - the medium is mounted but > > you get a warning that it's running at a slow speed. That seems > > reasonable. > > And IIRC the kernel will log a message when plugging a usb-2 device into > a port which is not usb-2 capable. But if I understand correctly, that is > not the issue here? Oh yeah, that might be the Windows warning I'm remembering. > The issue seems to be that sometimes a usb-2 device connects at usb-1 speed > even though plugged into a usb-2 port, right ? AIUI, yes. > That is just buggy hardware, and I don't think that warrants any special > handling. I would try cleaning the contacts of both the usb-port and > the usb-stick. Also if a usb-extension cable is involved, try replacing it, > or taking it out of the loop all-together. Well, yes, those are all perfectly sensible steps: I think the idea of the OP was to alert people that this was happening precisely so they could take the sensible debugging steps :) -- Adam Williamson Fedora QA Community Monkey IRC: adamw | Twitter: AdamW_Fedora | identi.ca: adamwfedora http://www.happyassassin.net -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
