I can confirm the bug with DRI_PRIME
Current setup is Intel Ivy Bridge + AMD Radeon 7730M
Reverting the following packages and their dependencies to their trusty-update
version fixed the issue
(Following packages with their dependencies)
xserver-xorg-input-all
xserver-xorg-input-wacom
xserver-xorg-video-glamoregl
xserver-xorg-input-synaptics
xserver-xorg-input-evdev
xserver-xorg-core
xserver-xorg-input-mouse
xserver-xorg-video-vesa
xserver-xorg-video-mach64
xserver-xorg-video-fbdev
xserver-xorg
xserver-xorg-input-vmmouse
xserver-xorg-video-modesetting
xserver-xorg-video-r128
The problem most probably is contained in the package xserver-xorg,
since most of these dependencies shouldn't affect prime (input)
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https://bugs.launchpad.net/bugs/1388647
Title:
DRI_PRIME=1 has no effect in Ubuntu 14.10
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