How important is x switch of during d-u?

[dibl]

Instead of rebooting you could unload and reload the respective module ....

Correct -- I normally do that with the nvidia proprietary driver module, so I don't need to reboot.

But as you say, and I agree, if you are not so sure about something like CPU microcode or libata or something like that, the non-expert (like me) is advised to reboot.

[DeepDayze]

Instead of rebooting you could unload and reload the respective module ....

Correct -- I normally do that with the nvidia proprietary driver module, so I don't need to reboot.

But as you say, and I agree, if you are not so sure about something like CPU microcode or libata or something like that, the non-expert (like me) is advised to reboot.

Yes its definitely a good idea to reboot if a filesystem or a disk driver got updated for example in order for it to take effect