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Old 06-10-2016, 03:22 PM   #1
biosboy4
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ThinkPad E555 usb problems


Hello,

I successfully installed Ubuntu to my ThinkPad E555 some time ago and now I'm moving it to Debian. however, it appears that is has problems with my computers usb ports..

I've already tried researching and disabling USB 3.0 in the bios. no lucky.

The device seems to work after boot, but if you plug in or re-plug anything, it ceases to work.

*scratches head*

help?
 
Old 06-10-2016, 07:49 PM   #2
ferrari
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Does the machine have a mixture of USB 2.0 and 3.0 ports? Do they all behave the same way? Debian/Kernel version?

When you plug in a given device, what is reported by the following command?
Code:
dmesg|tail
 
Old 06-10-2016, 08:06 PM   #3
ferrari
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I haven't had time to do a thorough search of bug reports, but I did find this RH bug report describing similar behaviour with some AMD XHCI chipsets and apparently related to broken power management (autosuspend)....

https://bugzilla.redhat.com/show_bug.cgi?id=1196943
 
Old 06-10-2016, 08:16 PM   #4
ferrari
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If it is an 'autosuspend' regression, then disabling it boot might be an acceptable workaround worth trying.

http://unix.stackexchange.com/questi...-7-10-or-above

In particular
Quote:
For Ubuntu and Debian, usbcore is compiled in the kernel, so create entries on /etc/modprobe.d will NOT work: we need to change the kernel boot parameters.

Edit the /etc/default/grub file and change the GRUB_CMDLINE_LINUX_DEFAULT line to add the usbcore.autosuspend=-1 option:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash usbcore.autosuspend=-1"

Note that quit splash were already present options. So keep other options you have too.

After save the file, update grub:

sudo update-grub

And reboot.
 
  


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