There is for example an unresolved bug in ubuntu 8.10 which has bit me severly. It relates to total failure of sleep/hibernate and all that wonderful functionality on pci-e boxes.
Are you saying that all my laptops with pci-e video chipsets should be failing to suspend? Suspend and hibernate have worked fine on all my laptops for many years with Ubuntu, 8.10 or otherwise.
And no I won't provide the link to the bug, find it yourself on launchpad [launchpad.net] (I believe that is the correct access point)
It might be worth looking for the bug if you are more specific about the problem since there certainly isn't a suspend problem with every pci-e equipped machine.
And while uptimes are great, I often need to shut my box down so as to avoid cooking the occupants of my small apartment because it gets so bloody hot in here (26-27+`Celcius) in the middle of a Canadian winter with the heating set at 22.
The only thing that I dislike after resuming from a suspend is waiting for the damned wifi to connect. Resume takes 2-3 seconds or less. Reconnecting sometimes seems to take forever, especially in busy apartment complexes with 20+ aps in range.