I got a Samsung 305U1A yesterday that's based on the e350 APU. Everything works in 11.04 (64 bit)except two things:
The fglrx driver doesn't work properly. It causes the kernel to output a bunch of ACPI-errors in dmesg and breaks suspend. The desktop also becomes a bit laggy when the driver is active. The open source driver works though. The latest driver from AMD has the same issue.
The screen has bacome garbled with horizontal lines at two occasions, once when I left the computer for a while compiling a kernel and once after resuming from hibernation. This is with the open source radeon driver, I don't use fglrx due to the other problem. I'm not sure what to do about this.
I also had to install a updated psmouse driver to get the touchpad to work properly: