Ubuntu stops doing anything if no key has been pressed

[VenomIreland]

Strange problem, Ubuntu will stop doing anything (i.e. screen will not refresh, downloads will not continue, clock will not update, searches will not continue) unless I press a key on the keyboard. What is causing the problem and how can I fix this?

[chrisod]

I'd look at your power management options first. Turn then all off. If the problem goes away you've likely identified the source of the problem. Then play with the sleep / hibernate settings to see if you can pin down exactly which one is causing the problem.

[VenomIreland]

Still does it

It rarely happens when fully booted, mostly it happens when booting and shut down, where I'll have to hold down any key for it to boot.