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Set Display Device State
Input Field
Major Function Number - 1
Minor Function Number - 1
Parameter 1 - Request display status
Bit - Built-in display (panel) status
= : Disable
= 1 : Enable
Bit 1 - External CRT status
= : Disable
= 1 : Enable
Bit 2 - TV status
= : Disable
= 1 : Enable
Bits 5-3 : Reserved
Bit 6 - Monitor detection ignore
= : Do not ignore
= 1 : Ignore
Bit 7 - Dual enable flag
= : Disable
= 1 : Enable
Parameter 2 - Reserved
Parameter 3 - Reserved
Parameter 4 - When parameter 2 (bits 7-) is 1h in return
of “Get Display Device State”:
Bits 31-16 : Reserved
Bits 15- : Display selection mode
Bit - Display selection mode
= : LCD - CRT selection mode
= 1 : LCD - TV selection mode
Bits 7-1 : Reserved
Parameter 5 - Reserved
Output Field
Return Code - Error status
Auxiliary Return Code - Reserved
Parameter 1 - Reserved
Parameter 2 - Reserved
Parameter 3 - Reserved
Parameter 4 - Reserved
Parameter 5 - Reserved
B-24 SMAPI BIOS