i have figured out that the vfs cache make us get a long standby time If changed vfs cache back to default (100) you will have the normal continues usage sooooo: i'm thinking to make a script that when we lock the screen of n900 the vfs cache changed to 10 which will give us a long standby time while n900 is locked and when we unlock the screen the vfs cache changes back to 100 which will give us a long continues usage time super perfect idea but not super perfect me to do that kind of scripts i don't have a lot of info about how does N900 manages the screen lock and unlock