That much I have figured out myself :).

Still, I think it's a bug that affects many users and it needs to be fixed. 
(And it's not that harmless. It is creating a huge file in the user's home 
directory, which may cause the drive to fill up.)

Regards,
Alex
>
>   My machine is Dell Inspiron 9400, with Nvidia's binary (OGL accelerated)
>   drivers.
>
>   $ konsole
>   X Error: BadDevice, invalid or uninitialized input device 169
>     Major opcode:  147
>     Minor opcode:  3
>     Resource id:  0x0
>   Failed to open device
>   X Error: BadDevice, invalid or uninitialized input device 169
>     Major opcode:  147
>     Minor opcode:  3
>     Resource id:  0x0
>   Failed to open device
> +
> + WORKAROUND:
> +
> + 1) Backup your configuration: open a terminal and write:
> + sudo cp -a /etc/X11/xorg.conf /etc/X11/xorg.conf.backup
> +
> + 2) Edit /etc/X11/xorg.conf : open a terminal and write:
> + kdesu kate /etc/X11/xorg.conf
> +
> + 3) Comment out problematic entries. Replace:
> +         InputDevice "stylus" "SendCoreEvents"
> +         InputDevice "cursor" "SendCoreEvents"
> +         InputDevice "eraser" "SendCoreEvents"
> + with :
> + # InputDevice "stylus" "SendCoreEvents"
> + # InputDevice "cursor" "SendCoreEvents"
> + # InputDevice "eraser" "SendCoreEvents"
> +
> + 4) Save the file and restart the computer.
> +
> + 5) If you encounter any problems (the graphical interface does not load)
> just restore the backup with: + sudo cp -a /etc/X11/xorg.conf.backup
> /etc/X11/xorg.conf
> +
> + and restart the computer.

-- 
X Error: BadDevice, invalid or uninitialized input device 
https://launchpad.net/bugs/42553

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