Month: February 2018

USB drive not recognised (error -71)

Posted on by Andy

CentOS 7 recently had an error when connecting a USB drive. I guess this came after updating to the latest kernel. The errors in dmesg or /var/log/messages were: 

[ 4159.607574] usb 1-1: new full speed USB device using uhci_hcd and address 4
[ 2079.875502] usb 1-1: device descriptor read/64, error -71
[ 2080.099379] usb 1-1: device descriptor read/64, error -71
[ 2080.319263] usb 1-1: new full speed USB device using uhci_hcd and address 5
[ 2080.443858] usb 1-1: device descriptor read/64, error -71
[ 4161.322029] usb 1-1: device descriptor read/64, error -71
[ 4161.537896] usb 1-1: new full speed USB device using uhci_hcd and address 6
[ 4161.945615] usb 1-1: device not accepting address 6, error -71
[ 4162.057577] usb 1-1: new full speed USB device using uhci_hcd and address 7
[ 4162.465330] usb 1-1: device not accepting address 7, error -71

After some googleing i found a fix for that: 

# vim /etc/modprobe.d/options.conf

and add following line to it: 

options usbcore use_both_schemes=y

more information about what this line does can be found here.

Disable services on OSX in terminal

Posted on by Andy

List all your services: 

$ launchctl list

List a specific service: 

$ launchctl list | grep "my service"

The result will be in the format PID / Status / Label. If PID is marked as "-" then the service is not started.

Get infos about the service: 

$ sudo launchctl procinfo <PID>

or get path and domain: 

$ sudo launchctl procinfo <PID> | grep -E "(domain|path)"

Now that you have the path to the plist file (path => <PLIST FILE>) and the user under which the service is started (domain => .user.XXX. => <UID>), you can disable the service by two ways: disable per user or disable systemwide.

Disable per user: 

$ launchctl disable user/<UID>/<LABEL>

Disable systemwide: 

$ sudo launchctl unload -w <PLIST FILE>