I recently bought a budget Asus laptop (X550D model) with a quad-core Richland A8-5550 APU storing an integrated 8550G and a discrete 8670m.
The device came OS free so I installed and used Windows 8 x64 on it for about 3 months without problems.
Today I wanted to give Linux a try on it but it totaly failed no matter the distro.
It completely hangs and freezes during boot and no graphical interface is started. It doesn't even allow me to access the other ttys. I tried the following distros, one by one with the same result: Fedora 20, OpeSUSE 13.1, Ubuntu 13.10, Antergos (Arch) Latest.
The farthest I got was with Antergos iso. I managed to boot with nomedeset on and install the distro but after reboot the same thing happened. When appending nomodeset to it again (Linux 3.13 kernel) I get *ERROR*No UMS support in radeon module but this time I can acces the other ttys and do a reboot.
The other distros couldn't be started successfully even with nomodeset on.