The bug that you have their has been resolved in 4.1 apparently so this must be a regression. As a temporary fix you may have to disable the screen locking and screensaver until this is investigated.
Go to:
System settings -> Advanced tab (have you noticed that you use the advanced tab more than the General tab) and select power management.
Select edit profiles on the left.
I changed the performance settings as my laptop is usually plugged in when I watch a movie on it.
Change the 'When the system is idle for more than' setting - I selected do nothing.
The right hand pane is arranged in to a most strange vertical tab arrangement - select screen from that and set the screen not to power off.
This suits me as when the screen is due to switch off it never works. That said I have probably tainted this report as from the 30 or so faults I have been involved with here none have been fixed until the new version of Ubuntu arrived. Infact the most critical one 284229 - I am surprised more haven't joined in there.
The bug that you have their has been resolved in 4.1 apparently so this must be a regression. As a temporary fix you may have to disable the screen locking and screensaver until this is investigated.
Go to:
System settings -> Advanced tab (have you noticed that you use the advanced tab more than the General tab) and select power management.
Select edit profiles on the left.
I changed the performance settings as my laptop is usually plugged in when I watch a movie on it.
Change the 'When the system is idle for more than' setting - I selected do nothing.
The right hand pane is arranged in to a most strange vertical tab arrangement - select screen from that and set the screen not to power off.
This suits me as when the screen is due to switch off it never works. That said I have probably tainted this report as from the 30 or so faults I have been involved with here none have been fixed until the new version of Ubuntu arrived. Infact the most critical one 284229 - I am surprised more haven't joined in there.