Comment 52 for bug 806032

Aahh, at last I found this entry. I was debugging the dsdt from my Asus UX32VD and I came to pretty much similar result.
The DID2 field is never initialized, which lets CDDS(DID2) return 0x1d and makes _DCS useless. _DCS is used in _Q0E and _Q0F.
The lines in question:
============================================================
Store (And (Arg0, 0x0F0F), Local0)
                    If (LEqual (Zero, Local0))
                    {
                        Return (0x1D)
                    }
============================================================
used by Q0F:

============================================================
If (LNotEqual (^^^GFX0.LCDD._DCS (), 0x1F))
                    {
                        Return (One)
                    }
============================================================

Since _DCS returns 0x1d, _Q0E and _Q0F returns silently one, instead of continuing until the Notify event is invoked.
Q0E/0F looks similar to your Q11, although _Q0E/F is a little bit more complicated, but the overall structure is the same.