Strange USB Scaner Problem

[norman]

< snip >

> Interestingly enough, this problem is listed in both the Edgy and Feisty
> pages for http://ubuntuguide.org/wiki/Ubuntu:Feisty see:
> 
> <http://ubuntuguide.org/wiki/Ubuntu:Feisty#Workaround_for_random_device_disconnections>
> 
> and for Edgy:
> 
> <http://ubuntuguide.org/wiki/Ubuntu:Edgy#Workaround_for_random_device_disconnections>
> 
> <quote>
>  Workaround for random device disconnections
> 
> Random disconnection is a kernel bug that is not fixed yet. Some users
> report randomly disconnecting USB devices, especially external hard
> drives. One solution is to start the system with the option "irqpoll" in
> grub, but this doesn't work for everybody, and is believed to make the
> whole system slower. The other solution is to disable USB 2.0. This will
> result in way slower read/write, but the connection remains stable.
> 
> To disable USB 2.0, type this in the terminal:
> 
> sudo modprobe -r ehci_hcd
> 
> Test if the copy/write process is stable, and if you want to disable USB
> 2.0 upon boot, type:
> 
> sudo sh -c 'echo blacklist ehci_hcd > /etc/modprobe.d/blacklist-ehci'
> sudo update-initramfs -u -k `uname -r`
> 
> </quote>
> 
> Perhaps the reason that I am not having problems with the scanner on my
> Canon MP750 is that I have no USB 2 ports - all of my ports are USB 1.1.

This seems most encouraging, I will give it a try. I presume that if it
does not work a reboot will return the system to how it was.

Norman