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Re: USB Mass Storage Class



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On Sat, Apr 02, 2016 at 06:38:45AM -0700, peter@easthope.ca wrote:
> From: <tomas@tuxteam.de>
> Date: Fri, 1 Apr 2016 22:43:21 +0200
> What does dmesg | tail say just after having inserted the camera?
> 
> root@dalton:/home/peter# dmesg | tail
> [  339.996021] usb 5-2: device descriptor read/64, error -62
> [  340.280019] usb 5-2: device descriptor read/64, error -62
> [  340.560023] usb 5-2: new low-speed USB device number 4 using ohci-pci
> [  340.740019] usb 5-2: device descriptor read/64, error -62
> [  341.024053] usb 5-2: device descriptor read/64, error -62
> [  341.304020] usb 5-2: new low-speed USB device number 5 using ohci-pci
> [  341.712030] usb 5-2: device not accepting address 5, error -62
> [  341.888022] usb 5-2: new low-speed USB device number 6 using ohci-pci
> [  342.296022] usb 5-2: device not accepting address 6, error -62
> [  342.296062] usb usb5-port2: unable to enumerate USB device
> root@dalton:/home/peter# 

Hm. It seems there's a more serious problem either with your USB
hardware or drivers. I'm way off my depth here, but throwing the
error message into a search engine (no, I don't "google" things ;-)
yields [1] [2], which recommend:

 (1) trying another USB cable/hub
 (2) reformatting the memory device (DON'T DO THAT WITH YOUR CAMERA,
   i'd say)
 (3) booting with kernel option 'irqpoll'
 (4) setting the old_scheme_first parameter in the usbcore driver,
   either by "echo Y | sudo tee /sys/module/usbcore/parameters/old_scheme_first"
   or by booting with kernel option 'usbcore.old-scheme-first=1'
 (5) booting with kernel option 'acpi=off'

Since things seem to have gone south after upgrade, (1) doesn't seem
very plausible. OTOH it's usually a very cheap option to try, so
if you have some cables lying around, I'd try that first. Options
(3) and (4) seem to be worth a try; I haven't much confidence in (5)
and I'd rule out (2) -- who knows whether the camera has important
tidbits in the storage it exports as USB.

[1] https://bbs.archlinux.org/viewtopic.php?id=38859
[2] http://ubuntuforums.org/showthread.php?t=1938359

regards
- -- t
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