Created attachment 172141 [details]
dmesg with selected NVidia card AC power on

This model has two different video card Intel and Nvidia.
I can choose three variants in the BIOS (Intel, Nvidia or Nvidia Optimus).
My T530 can't boot with selected Nvidia card and AC power off.
If AC power is on - boot without problem.
I don't have problem with Intel card in  both variants (AC power on or off).
If AC power is turned off after the download stops the following lines:
usbus1: 480Mbps High Speed USB v2.0
usbus2: 480Mbps High Speed USB v2.0
ugen0.1: <0x8086> at usbus0
uhub0: <0x8086 XHCI root HUB, class 9/0, rev 3.00/1.00, addr 1> on usbus0
ugen1.1: <Intel> at usbus1
uhub1: <Intel EHCI root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus1
ugen2.1: <Intel> at usbus2
uhub2: <Intel EHCI root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus2

pciconf -lv:
hostb0@pci0:0:0:0:      class=0x060000 card=0x21f617aa chip=0x01548086 rev=0x09 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '3rd Gen Core processor DRAM Controller'
    class      = bridge
    subclass   = HOST-PCI
pcib1@pci0:0:1:0:       class=0x060400 card=0x21f617aa chip=0x01518086 rev=0x09 hdr=0x01
    vendor     = 'Intel Corporation'
    device     = 'Xeon E3-1200 v2/3rd Gen Core processor PCI Express Root Port'
    class      = bridge
    subclass   = PCI-PCI
xhci0@pci0:0:20:0:      class=0x0c0330 card=0x21f617aa chip=0x1e318086 rev=0x04 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '7 Series/C210 Series Chipset Family USB xHCI Host Controller'
    class      = serial bus
    subclass   = USB
none0@pci0:0:22:0:      class=0x078000 card=0x21f617aa chip=0x1e3a8086 rev=0x04 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '7 Series/C210 Series Chipset Family MEI Controller'
    class      = simple comms
em0@pci0:0:25:0:        class=0x020000 card=0x21f317aa chip=0x15028086 rev=0x04 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '82579LM Gigabit Network Connection'
    class      = network
    subclass   = ethernet
ehci0@pci0:0:26:0:      class=0x0c0320 card=0x21f617aa chip=0x1e2d8086 rev=0x04 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '7 Series/C210 Series Chipset Family USB Enhanced Host Controller'
    class      = serial bus
    subclass   = USB
hdac1@pci0:0:27:0:      class=0x040300 card=0x21f617aa chip=0x1e208086 rev=0x04 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '7 Series/C210 Series Chipset Family High Definition Audio Controller'
class      = multimedia
    subclass   = HDA
pcib2@pci0:0:28:0:      class=0x060400 card=0x21f617aa chip=0x1e108086 rev=0xc4 hdr=0x01
    vendor     = 'Intel Corporation'
    device     = '7 Series/C210 Series Chipset Family PCI Express Root Port 1'
    class      = bridge
    subclass   = PCI-PCI
pcib3@pci0:0:28:1:      class=0x060400 card=0x21f617aa chip=0x1e128086 rev=0xc4 hdr=0x01
    vendor     = 'Intel Corporation'
    device     = '7 Series/C210 Series Chipset Family PCI Express Root Port 2'
    class      = bridge
    subclass   = PCI-PCI
pcib4@pci0:0:28:2:      class=0x060400 card=0x21f617aa chip=0x1e148086 rev=0xc4 hdr=0x01
    vendor     = 'Intel Corporation'
    device     = '7 Series/C210 Series Chipset Family PCI Express Root Port 3'
    class      = bridge
    subclass   = PCI-PCI
ehci1@pci0:0:29:0:      class=0x0c0320 card=0x21f617aa chip=0x1e268086 rev=0x04 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '7 Series/C210 Series Chipset Family USB Enhanced Host Controller'
    class      = serial bus
    subclass   = USB
isab0@pci0:0:31:0:      class=0x060100 card=0x21f617aa chip=0x1e558086 rev=0x04 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'QM77 Express Chipset LPC Controller'
    class      = bridge
    subclass   = PCI-ISA
ahci0@pci0:0:31:2:      class=0x010601 card=0x21f617aa chip=0x1e038086 rev=0x04 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '7 Series Chipset Family 6-port SATA Controller [AHCI mode]'
    class      = mass storage
    subclass   = SATA
ichsmb0@pci0:0:31:3:    class=0x0c0500 card=0x21f617aa chip=0x1e228086 rev=0x04 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = '7 Series/C210 Series Chipset Family SMBus Controller'
    class      = serial bus
    subclass   = SMBus
vgapci0@pci0:1:0:0:     class=0x030000 card=0x21f617aa chip=0x0def10de rev=0xa1 hdr=0x00
    vendor     = 'NVIDIA Corporation'
    device     = 'GF108M [NVS 5400M]'
    class      = display
    subclass   = VGA
hdac0@pci0:1:0:1:       class=0x040300 card=0x21f617aa chip=0x0bea10de rev=0xa1 hdr=0x00
    vendor     = 'NVIDIA Corporation'
    device     = 'GF108 High Definition Audio Controller'
    class      = multimedia
    subclass   = HDA
sdhci_pci0@pci0:2:0:0:  class=0x088001 card=0x21f617aa chip=0xe8231180 rev=0x05 hdr=0x00
    vendor     = 'Ricoh Co Ltd'
    device     = 'PCIe SDXC/MMC Host Controller'
    class      = base peripheral
iwn0@pci0:3:0:0:        class=0x028000 card=0x13118086 chip=0x00858086 rev=0x34 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Centrino Advanced-N 6205 [Taylor Peak]'
    class      = network