Comment # 48 on bug 42960 from Alex Deucher

(In reply to comment #47)
> With kernel 3.15 and later I got "diplay not working after suspend" again.
> But I find out how to work around. I had scrip on shortcut for KDE and this
> script made display to work. Command of script is "sleep 1; xset dpms force
> standby".

Can you bisect?