Thread: Force device reset\su and sudo

hello fellow linuxers,
i've been using ubuntu few months , have 2 questions bug me:

first regarding microsoft wireless usb mouse own (explorer bluetrack). whenever use windows , restart , boot ubuntu, scrollwheel 5 times faster. out of tests have conducted time ago know problem not software-based, mouse sends "wheel scrolled" message 5 times each scrolling. when physically disconnect , reconnect wireless transceiver, problem solved until next time boot windows.

have been told firmware issue - windows uploads microsoft's firmware mouse @ boot time, configured send 5 scrolling messages. because motherboard has on\off charge, usb power on , mouse retains firmware. linux not upload new firmware devices @ boot time, why reconnection solves issue. question - how can make ubuntu restart usb mouse (or usb devices) automatically @ boot?

second thing regarding su , sudo. when use "sudo <command>" enter password , gain root access, fine. when try use password "su" command however, "su: authentication failure". have seen same issue on numerous other ubuntu machines. there difference between su , sudo or using incorrectly?

thanks,
batman

the first firmware issue. rather doing warm reboot ubuntu, try shutting down windows, waiting few seconds , doing cold boot ubuntu. helps faulty firmware loading issues wireless cards when going 1 os another. might mouse firmware problem.

regard sudo/su, typing "su" in terminal causes system prompt root password, not yours. root account locked default in ubuntu, hence error message. if want root terminal, type:

code:

sudo -i

also, have read of this. explains everything:

https://help.ubuntu.com/community/rootsudo

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