VGA switcheroo doesn't work on 14.04 intel/ati acer 5820TG

Question

Before I updated from 13.10 to 14.04, vga switcheroo worked fine, using the free radeon-driver. Now vga switcheroo doesn't work anymore/doesn't take effect:

cat /sys/kernel/debug/vgaswitcheroo/switch
0:IGD:+:Pwr:0000:00:02.0 1:DIS: :DynPwr:0000:01:00.0 2:DIS-Audio: :Pwr:0000:01:00.1

after trying to turn off the unused discrete graphic:

echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
cat /sys/kernel/debug/vgaswitcheroo/switch
0:IGD:+:Pwr:0000:00:02.0 1:DIS: :DynPwr:0000:01:00.0 2:DIS-Audio: :Pwr:0000:01:00.1

Is there anyone with the same isue or was anyone able to use vga switcheroo on Ubuntu 14.04?

Thanks