Arch Linux

Linux-Joker

Member

Registered: 2015-11-22

Posts: 17

usb device does not work on startup

Hello guys

i bought a new computer and everything seems to work under arch linux but one thing drives me really crazy:

I have an encrypted drive in my computer. So after grub starts and i choose my kernel version the computer asks me for a password. And there is the problem. My keyboard does not work anymore..

While i am in the grub menu the keyboard works flawless.. but as soon as i am in the next step i get these kind of errors:

usb 6-1: device descriptor read/64, error -32
usb 6-1: device not accepting address 4, error -32
usb 6-1: device not accepting address 5, error -32
usb usb6-port1: unable to enumerate USB device

I think 8 of 10 times i get this error. And as soon i get this my keyboard does not work anymore..

What should i do?? I am starting to get a mental breakdown..

wtx

Member

Registered: 2014-06-09

Posts: 90

Re: usb device does not work on startup

Have you tried to use another USB port?

Beli3ver

Member

Registered: 2013-08-25

Posts: 19

Re: usb device does not work on startup

Do you habe in the BIOS an option that call: iommu ?

When yes, try this

iommu => enable

boot, after that, change the in  /etc/default/grub following:

GRUB_CMDLINE_LINUX="iommu=soft" 

then do

grub-install --recheck /dev/sdX
grub-mkconfig -o /boot/grub/grub.cfg

restart.
Disbale immou in BIOS.
Now it should work out of the box.

IMPORTANT: before change the grub, don't use your USB 3 Ports.

Linux-Joker

Member

Registered: 2015-11-22

Posts: 17

Re: usb device does not work on startup

Do you habe in the BIOS an option that call: iommu ?

When yes, try this

iommu => enable

boot, after that, change the in  /etc/default/grub following:

GRUB_CMDLINE_LINUX="iommu=soft" 

then do

grub-install --recheck /dev/sdX
grub-mkconfig -o /boot/grub/grub.cfg

restart.
Disbale immou in BIOS.
Now it should work out of the box.

IMPORTANT: before change the grub, don't use your USB 3 Ports.

Wow, that really works!
In the last days i tested many tips written in other forums, but unfortunately nothing changed.

I have an Gigabyte motherboard and therefore i get an option like "iommu-controller".

Until now i still dont get the error. Thank you very much!
But can you explain why this tip works? I thought that "iommu" belongs to virtualisation stuff..