@Oliver I have a D150 also and had the same problem you are having until today. I just flashed a new BIOS (v1.13) and that seems to have fixed the issue of the netbook suspending when I disconnect the AC power.
@Oliver I have a D150 also and had the same problem you are having until today. I just flashed a new BIOS (v1.13) and that seems to have fixed the issue of the netbook suspending when I disconnect the AC power.