Lenovo ThinkPad 770X Technical Reference Manual for the ThinkPad 770 - Page 99
Bit 1 - External CRT status
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Output Field Return Code - Error status Auxiliary Return Code - Reserved Parameter 1 - Bits 15-8 : Reserved Bits 7- : Capability of display device function Bit - Display function type = : Not support = 1 : Support Bits 7-1 : Reserved Parameter 2 - Bits 15-8 Display current 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 6-3 : Reserved Bit 7 - Dual enable flag = : Disable = 1 : Enable Bits 7- : Display function type = h : No TV-out model = 1h : Not support model for simultaneous display of TV and CRT Parameter 3 - Reserved Parameter 4 - When parameter 2 (bits 7- ) is 1h: 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 SMAPI BIOS B-23