I just upgraded to 14.10 from 14.04, and the built-in driver for my ATI Radeon HD 5450 sorta-kinda works okay because I do get a signal on my monitor, but it lacks any kind of acceleration, making the Dash and the menu reallly slow, and even typing this post has a significant keyboard-to-screen lag. What's more, the built-in drivers don't seem to support screen standby, so the monitor stays on forever :-/
I've tried several*) methods of getting proprietary drivers to work, but they all fail the same way: the boot simply ends at tty1 instead of going into the graphical mode.
Is the root cause that no 14.10-compatible driver exist? Or is there a "canonical" method that is proven to work, for ATI, on 14.10? (pun intended...)
As far as I understand the matter by now, the problem seems to be that 14.10 uses X server version 1.16 but all the drivers only mention X server 1.15...
*) Methods I've tried:
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