終於解決了..........
因為看起來實在是跟這邊有關

我把igxp32.inf內的這幾行稍微修改了一下
[NonEDIDMode_AddSwSettings]
HKR,, TotalDTDCount, %REG_DWORD%, 0 ; This shows number of DTDs to be used. ; 0-->Disable the feature.
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我把dword後面的0改成1
我自己想像照後面的字義應該是開啟的意思

;Following keys have 20 bytes (18 byte DTD + 2 Byte flags).
HKR,, DTD_1,%REG_BINARY%, 01,1D,80,18,71,1C,16,20,58,2C,1A,00,00,00,00,00,00,86,37,01 ;[email protected]
HKR,, DTD_2, %REG_BINARY%, 01,1D,80,D0,72,1C,16,20,10,2C,1A,80,00,00,00,00,00,86,37, 01 ;[email protected]
HKR,, DTD_3,%REG_BINARY%, 01,1D,00,BC,52,D0,1E,20,B8,28,25,40,00,00,00,00,00,04,37, 01 ;[email protected]
HKR,, DTD_4, %REG_BINARY%, 01,1D,00,72,51,D0,1E,20,6E,28,25,00,00,00,00,00,00,06,37,01 ;[email protected]
HKR,, DTD_5,%REG_BINARY%, 00, 00, 00 ,00, 00, 00,00, 00, 00,00, 00, 00,00, 00, 00,00, 00, 00,00, 00 ;Fifth DTD

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接下來把1280x720後面的"Non-interlaced"改成"interlaced"
重新安裝後
雖然會出現未被認證的驅動程式
可是安裝完就有出現1920x1080的選項了
真是的= =
平平都是官網載的驅動
為什麼我的要特別修改才會出現16:9的模式阿........