Intel HD5500 disable v-sync

I posted some while ago about v-sync and intel GPU's and I've found the same issue and work around as before, just to re-iterate its just ~/.drirc that needs changing and you can use the driconf gui but it will get the driver name wrong... or rather it will use the right driver name however the only driver name that seems to have any effect is dri2 ! here's the ~/.drirc that I'm currently using on a system with a HD5500

<device screen="0" driver="dri2">
 <application name="Default">
 <option name="vblank_mode" value="0"/>
 </application>
</device>

I have no idea if this is an issue with dri2 or with the Intel driver or driconf, much less where I could report it too...