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Message-ID: <50F12A65.90408@gmail.com> Date: Sat, 12 Jan 2013 17:18:29 +0800 From: Lan Tianyu <lantianyu1986@...il.com> To: Alex Riesen <raa.lkml@...il.com> CC: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, linux-usb@...r.kernel.org Subject: Re: USB device cannot be reconnected and khubd "blocked for more than 120 seconds" On 2013年1月12日 15:48:59, Alex Riesen wrote: > On Fri, Jan 11, 2013 at 10:04 PM, Alex Riesen <raa.lkml@...il.com> wrote: >> Hi, >> >> the USB stick (an Cruzer Titanium 2GB) was not recognized at any of >> the USB ports of this system (an System76 lemu4 laptop, XHCI device) >> after it was removed. If I attempt to insert it again in any of the >> ports (one of the two USB3, or the USB2) the led on the stick lights >> up shortly and if off again. There is no media detection messages in >> the dmesg output, only that from the first time: >> >> usb 1-1.2: new high-speed USB device number 3 using ehci-pci >> usb 1-1.2: New USB device found, idVendor=0781, idProduct=5408 >> usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 >> usb 1-1.2: Product: U3 Titanium >> usb 1-1.2: Manufacturer: SanDisk Corporation >> usb 1-1.2: SerialNumber: 0000187A3A60F1E9 >> scsi6 : usb-storage 1-1.2:1.0 >> io scheduler deadline registered (default) >> usb 1-1.2: USB disconnect, device number 3 >> >> The kernel is v3.8-rc3. I never had this problem in 3.7. I could almost >> reproduce the problem later in a simplified setup (init=/bin/bash) on >> USB3 ports by inserting and removing the stick quickly. Almost - because >> the USB3 ports recovered after some time, while the USB2 port never >> experienced the problem. > > One more detail: I usually use the "noop" elevator. That time it was > the "deadline". And I just reproduced it easily with "deadline". Can you provide the output of dmesg with CONFIG_USB_DEBUG? This will be helpful. > -- > To unsubscribe from this list: send the line "unsubscribe linux-usb" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Best regards Tianyu Lan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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