On Thu, Nov 13, 2014 at 08:06:05AM -0800, Greg KH wrote: > On Thu, Nov 13, 2014 at 04:59:32PM +0100, Milan Kocian wrote: > > On Thu, Nov 13, 2014 at 07:44:20AM -0800, Greg KH wrote: > > > On Thu, Nov 13, 2014 at 10:17:07AM +0100, Milan Kocian wrote: > > > > Hi, > > > > > > > > after upgrade from 3.16 to 3.17.2 this device isn't in lsusb output > > > > after plugging in : > > > > > > > > Bus 004 Device 002: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port > > > > (driver pl2303, usb to serial converter) > > > > > > > > The only way how to make it functional is to boot machine with connected device. > > > > But after unlug/plug the device disappeared and isn't detected again. > > > > > > > > > > > > (Probably a found once more non-functional device (USB keyboard) that wasn't > > > > detected but I thinked that problem is in keyboard...) > > > > > > > > Some other devices work fine (USB modem, flashdisk). > > > > > > > > Workaround is to downgrade to the kernel 3.16. > > > > > > > > System: debian unstable, selfcompiled vanilla, Thinkpad X61x > > > > > > Are there any kernel log messages when you plug the device in? > > > > > > thanks, > > > > > > greg k-h > > > > > > > No. > > Nothing at all? That indicates that the hub isn't powered on at all, so > it's an electrical issue? Very confused... > > greg k-h > Yes, nothing at all. But when I connect other device to the same port (e.g USB gsm modem) it's detected, so I don't think its electrical issue. Yes, it's very confused. Initially I thinked that USB-serial convertor is dead so I tried it for sure in another machine but it works. Then I remembered non-functional USB keyboard and began to look at the problem :-). And result is that problem is in new kernel. I can try patches, enable some debug options but you must say what to try :-). (I am not USB expert). Best regards and thanks for your answer, -- Milan Kocian -- 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
