- 具有雙啟動Vista Ultimate和Ubuntu 10.10的HP Pavilion dv9740us
- 英特爾酷睿2 Duo T5450 / 1.67 GHz
- NVIDIA GeForce 8600M GS @ 512MB
- 3G DDR2 RAM，
Most likely it was because there was a certain driver in use due to Windows/Vista being installed. During your LiveCD usage it's using the currently loaded drives from the main installation I.E. Windows and it uses those. When you install well, that all goes away. Most likely you'll need some proprietary driver or driver(s) if they even exist which I'm sure they do.
I can offer a workaround for this problem. Boot Windows (from stick, from disk, whatever) and make sure this Windows has installed the appropriate HP Quicklaunch Button driver (find it here). After starting Windows, use the touch buttons. If the buttons work, you can restart you laptop and boot ubuntu. It should work then, it did for me.
Although it is just a workaround, I hope it helps.