Comment # 54 on bug 66963 from Scias

I reverted to the "old" kernel + Comment 40 patch and it works now.
I can't retrieve the git revision as I cleaned the sources but I cloned the
drm-fixes-3.11 the 30/7 near 11:30 gmt. 

I'll try different versions in between with Comment 40 patch to spot the change
that cause it to not work anymore.