Lenovo ThinkPad 600 Technical Reference Manual for the ThinkPad 600 - Page 100
Set Display Device State, SMAPI BIOS
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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