(I don't know whether the blobs for the PowerVR atoms support any. But who wants to inflict those on themselves?)
What's the use of running an Atom and getting "only slightly" less performance then the E-350? The E-350 is cheaper, uses a similar amout of power and has better performance even with the incomplete mesa drivers. So I'm happy with my E-450 based laptop, it's a huge improvement from the crappy Atom based one I had before.
On Linux the open drivers are much better integrated into the system e.g. work natively with new xorg-releases, xrandr etc. Nobody has to wait for AMD or NVIDIA to update their drivers for new features or bug-fixes.
People do this a lot, talk about "GPU video playback" in scenarios where the video is decoded entirely in software.
The Radeon open source drivers have many issues with APUs. The biggest is probably that the lack of power management permanently forces the GPU to a low clock, limiting performance to about 30% of what it should be. Additionally, 2D rendering is quite unoptimized, and doesn't performance at all like UXA or SNA. I have noticed sluggish video playback (with software decoding) too, a slow Xvideo implementation appears to be the cause.
In practice, E-350/450 graphics indeed perform just like GMA950 in most cases, if not worse.
I got a Radeon HD 6450 to use with a TV so with an HDMI connection. No, not some complicated TV Tuner card or anything too drastic. It CANNOT detect anything properly. The resolution is not detected properly. This is with VGA. If I use it with HDMI, the sound is scratchy and the resolution is detected but it cannot detect the size of the TV. It interprets a 72" TV when it's 24"! LOL!
I am so impressed with the features of the FOSS driver!!!!! :D
Where is your bug report?
AMD doesn't have that many linux graphics people and the open source team is even smaller. Sure, you can make fun of them, but you could also help them by telling them when something doesn't work.