Is haiku not supported with two monitor?

is haiku not supported with two monitor?
r1b4(56578+87) (BIOS mode)
intel celeron n2840

screen information with haiku
philips consumer electronics company ph107e/s/t7 15’2
vesa driver(genetic vesa)
1366*768 32 85hz

the philips’s screen no any display.
Laptops’s screen display.
return to linux Mint.
if BIOS mode, philips’s screen display , Laptops’s screen not display.
if UEFI mode, all two screen display.

so, is the problem related with video card or UEFI mode?
or just not supported with haiku?

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