09-16-2011 08:15 AM
I had the same problem with dm4-2070us and I just finished chatting with HP customer service. The representative asked me to do few things including setting the BIOS to default. I also reinstalled the driver. NOTHING WROKED.
He told me to do a complete revovery of the system to factory reset. I didn't want to go that route.
What I did is downloaded the older driver for dm4-1162us and installed on my dm4-2070 and it fixed the problem. Now the only thing I'm missing is the Dolby sound, about which I don't care that much.
Hope this help you also.
Conclusion: It's a software problem. May HP come uo with a new driver to fix it, SOON.