I just bought a new Toshiba laptop, Satellite L745D, which comes with an AMD A6-3400M processor (Llano). The problem is that the latest versions of Linux distros, Ubuntu 11.10 or Mint 12, will not install on the laptop, can't even get the Live CD to start in most cases. It produces a blank screen during install. It seems to me that the Linux AMD video drivers don't support the internal GPU of the Llano. Any idea what's going on?
First distribution I tried worked on mine, Zorin 5.2 64bit. Now that's based on the slightly older Ubuntu 11.04 Natty. The kernel is one of the 2.6es. Don't load on the latest AMD proprietary drivers or you get the hanging problem.
Because I couldn't get my soundcard, an e-mu 0404, to work I tried out some live distros to do a test that's when I discovered the same loading problems as you. 11.10 Ubuntu, Xubuntu, Mint 12 Gnome and Debian. Even the usually indestructible Puppies didn't work.
Mageia 1.0 worked so did Zenwalk. Both these have the 2.6 kernel though. Sabayon 7 also works but that updates itsself to the 3.0 kernel so I didn't want to go there just in case. The latest version of PC-BSD also got me to the installation screen no problems.
BTW, another thing I noticed, that even if you get video to work on one of those older Linux releases, the release doesn't support the machine's native resolution. In my case, the native resolution is 1366x768, the resolution it comes up with is 1024x768 instead.