ссылка на этот текст :

https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.17/+bug/61235/comments/123





On Sun, Sep 7, 2014 at 4:16 PM, Q <email address hidden> wrote:

> I am seeing this problem in one or another form since ~2006, and it
> looks like it will be with us for a while.
>
> My understanding is that there may be a *number* of issues with USB 2.0
> + that end with more or less similar symptoms, producing lots of
> confusion.
>
> A number of workarounds exist, the above is just one of them; basically
> it all goes down to some way of limiting the connection speed, after
> what the USB connection seems to survive; the most robust ( and the
> worst in the terms of efficiency ) is switching down to USB 1.0 :
>
> https://help.ubuntu.com/community/Mount/USB#USB_2_Issues
> http://www.thinkwiki.org/wiki/Problem_with_USB_2.0
>
> Please note that for the most of the distributions we can't just do
> "rmmod ehci_hcd" anymore and have to "unbind" the driver from the usb
> hub -- or even from a specific port :
>
> http://lists.en.qi-
> hardware.com/pipermail/discussion/2011-August/008508.html
>
> ( The obscure numbers behind this magic are described here :
> http://www.makelinux.net/ldd3/?u=chp-12-sect-1, here : http://www.mail-
> <email address hidden>/msg16895.html and here
> : http://www.linux-usb.org/FAQ.html#i6 ; this also contains a great
> introduction in sysfs:
> http://www.reactivated.net/writing_udev_rules.html )
>
> At USB 2.* level, limiting the speed normally solves most of the issues
> except for some "intellectual" hardware that likes to go offline to save
> power etc and never wakes up ; one of these is changing the
> "max_sectors" value: http://www.linux-usb.org/FAQ.html#i5  ; it may have
> to do something with setting the proper buffer size as well )
>
> in old days one have had to either write an udev rule ( see the link
> above ), or add the device into "unusual devs" and then recompile the
> kernel: http://www.phildev.net/linux/usb-unusualdevs-notes.html,
> http://lxr.free-electrons.com/source/include/linux/usb_usual.h,
> http://lxr.free-electrons.com/source/drivers/usb/storage/unusual_devs.h,
> http://yarchive.net/comp/linux/quirks.html ;
>
> nowadays things are probably better :
> http://ftp.dei.uc.pt/pub/linux/kernel/people/gregkh/usb/2.6/2.6.28/usb-
> storage-make-the-quirks-module-parameter-writable.patch, http://lxr
> .free-electrons.com/source/Documentation/kernel-parameters.txt#L3444 and
> one can pass certain parameters to the kernel at the boot time :
> http://lxr.free-electrons.com/source/Documentation/kernel-
> parameters.txt#L9, e.g.
> http://anythingbutipod.com/forum/showthread.php?t=49138 .
>
> Back to limiting the connection speed. My favorite way to go is via
> cgroups (
> http://linux.oracle.com/documentation/EL6/Red_Hat_Enterprise_Linux-6
> -Resource_Management_Guide-en-US.pdf,
> http://www.mjmwired.net/kernel/Documentation/cgroups.txt,
> http://www.kernel.org/doc/Documentation/cgroups/devices.txt,
> http://www.oracle.com/technetwork/articles/servers-storage-admin
> /resource-controllers-linux-1506602.html, etc ) along with a related
> udev rule ; this seems to work well in most of the cases.
>
> I will skip a number of related workarounds to keep this comment at a
> reasonable size ; returning back to the "intellectual" hardware, there
> are at least two quirk parameters to mention: "autosuspend" and
> "old_scheme_first" .
>
> First allows us to disable auto-suspending: http://lxr.free-
> electrons.com/source/Documentation/kernel-parameters.txt#L3407,
> http://wiki.xbmc.org/index.php?title=HOW-
> TO:Suspend_and_wake_in_Ubuntu#Disable_Usbcore_Autosuspend,
> http://www.kernel.org/doc/Documentation/usb/power-management.txt, e.g. :
> http://linuxtv.org/wiki/index.php/Leadtek_WinFast_DTV2000DS#Losing_1_tuner
> ;
>
> the second one is normally advised as a random shot when there is "some
> unknown bad magic happening", and I list it only for some very rare
> occasions ; here is a link: http://www.linux-usb.org/FAQ.html#ts10 .
>
> hth,
> /t13
>
> PS. In some specific case, reading around the above links may also help
> )
>
>
>
>
> --
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/61235
>
> Title:
>   USB mass storage stops working after a while
>
> Status in “linux” package in Ubuntu:
>   Won't Fix
> Status in “linux-source-2.6.17” package in Ubuntu:
>   Fix Released
> Status in “linux-source-2.6.19” package in Ubuntu:
>   Invalid
> Status in “linux-source-2.6.20” package in Ubuntu:
>   Won't Fix
> Status in “linux-source-2.6.22” package in Ubuntu:
>   Won't Fix
> Status in “udev” package in Ubuntu:
>   Invalid
>
> Bug description:
>   I just plugin an external USB 2.0 hard disk.  It is detected and seems
> to work.
>   However, when I start copying large files it stops working (unmounts
> itself) after a while.
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/61235/+subscriptions
>