我的电脑有一个 VGA 和两个显示端口。VGA 显示器工作正常，但将第二台显示器连接到 DP（使用 DVI -> DP 适配器）时，我无法使其工作。显示器连接不可见。
我不知道我能做什么。下面我粘贴了一些可能有用的信息。
兰德
VGA1 connected 1280x1024+0+0 (0x47) normal (normal left inverted right x axis y HDMI1 disconnected (normal left inverted right x axis y axis)
Identifier: 0x43
Timestamp: 18369
Subpixel: unknown
Clones:
CRTCs: 0 1 2
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
Broadcast RGB: Full
supported: Full Limited 16:2
audio: auto
supported: off auto on
DP1 disconnected (normal left inverted right x axis y axis)
Identifier: 0x44
Timestamp: 18369
Subpixel: unknown
Clones:
CRTCs: 0 1 2
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
Broadcast RGB: Full
supported: Full Limited 16:2
audio: auto
supported: off auto on
HDMI2 disconnected (normal left inverted right x axis y axis)
Identifier: 0x45
Timestamp: 18369
Subpixel: unknown
Clones:
CRTCs: 0 1 2
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
Broadcast RGB: Full
supported: Full Limited 16:2
audio: auto
supported: off auto on
DP2 disconnected (normal left inverted right x axis y axis)
Identifier: 0x46
Timestamp: 18369
Subpixel: unknown
Clones:
CRTCs: 0 1 2
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
Broadcast RGB: Full
supported: Full Limited 16:2
audio: auto
supported: off auto on
lspci-v
00:00.0 Host bridge: Intel Corporation Ivy Bridge DRAM Controller (rev 09)
Subsystem: Dell Device 0577
Flags: bus master, fast devsel, latency 0
Capabilities: [e0] Vendor Specific Information: Len=0c <?>
Kernel driver in use: agpgart-intel
00:02.0 VGA compatible controller: Intel Corporation Ivy Bridge Graphics Controller (rev 09) (prog-if 00 [VGA controller])
Subsystem: Dell Device 0577
Flags: bus master, fast devsel, latency 0, IRQ 43
Memory at f7800000 (64-bit, non-prefetchable) [size=4M]
Memory at e0000000 (64-bit, prefetchable) [size=256M]
I/O ports at f000 [size=64]
Expansion ROM at <unassigned> [disabled]
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Capabilities: [a4] PCI Advanced Features
Kernel driver in use: i915
Kernel modules: i915
00:14.0 USB controller: Intel Corporation Panther Point USB xHCI Host Controller (rev 04) (prog-if 30 [XHCI])
Subsystem: Dell Device 0577
Flags: bus master, medium devsel, latency 0, IRQ 41
Memory at f7c20000 (64-bit, non-prefetchable) [size=64K]
Capabilities: [70] Power Management version 2
Capabilities: [80] MSI: Enable+ Count=1/8 Maskable- 64bit+
Kernel driver in use: xhci_hcd
00:16.0 Communication controller: Intel Corporation Panther Point MEI Controller #1 (rev 04)
Subsystem: Dell Device 0577
Flags: bus master, fast devsel, latency 0, IRQ 44
Memory at f7c3c000 (64-bit, non-prefetchable) [size=16]
Capabilities: [50] Power Management version 3
Capabilities: [8c] MSI: Enable+ Count=1/1 Maskable- 64bit+
Kernel driver in use: mei
Kernel modules: mei
00:16.3 Serial controller: Intel Corporation Panther Point KT Controller (rev 04) (prog-if 02 [16550])
Subsystem: Dell Device 0577
Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 19
I/O ports at f0e0 [size=8]
Memory at f7c3a000 (32-bit, non-prefetchable) [size=4K]
Capabilities: [c8] Power Management version 3
Capabilities: [d0] MSI: Enable- Count=1/1 Maskable- 64bit+
Kernel driver in use: serial
00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network Connection (rev 04)
Subsystem: Dell Device 052c
Flags: bus master, fast devsel, latency 0, IRQ 42
Memory at f7c00000 (32-bit, non-prefetchable) [size=128K]
Memory at f7c39000 (32-bit, non-prefetchable) [size=4K]
I/O ports at f080 [size=32]
Capabilities: [c8] Power Management version 2
Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [e0] PCI Advanced Features
Kernel driver in use: e1000e
Kernel modules: e1000e
00:1a.0 USB controller: Intel Corporation Panther Point USB Enhanced Host Controller #2 (rev 04) (prog-if 20 [EHCI])
Subsystem: Dell Device 0577
Flags: bus master, medium devsel, latency 0, IRQ 16
Memory at f7c38000 (32-bit, non-prefetchable) [size=1K]
Capabilities: [50] Power Management version 2
Capabilities: [58] Debug port: BAR=1 offset=00a0
Capabilities: [98] PCI Advanced Features
Kernel driver in use: ehci_hcd
00:1b.0 Audio device: Intel Corporation Panther Point High Definition Audio Controller (rev 04)
Subsystem: Dell Device 0577
Flags: bus master, fast devsel, latency 0, IRQ 45
Memory at f7c30000 (64-bit, non-prefetchable) [size=16K]
Capabilities: [50] Power Management version 2
Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
Capabilities: [100] Virtual Channel
Capabilities: [130] Root Complex Link
Kernel driver in use: snd_hda_intel
Kernel modules: snd-hda-intel
00:1d.0 USB controller: Intel Corporation Panther Point USB Enhanced Host Controller #1 (rev 04) (prog-if 20 [EHCI])
Subsystem: Dell Device 0577
Flags: bus master, medium devsel, latency 0, IRQ 23
Memory at f7c37000 (32-bit, non-prefetchable) [size=1K]
Capabilities: [50] Power Management version 2
Capabilities: [58] Debug port: BAR=1 offset=00a0
Capabilities: [98] PCI Advanced Features
Kernel driver in use: ehci_hcd
00:1f.0 ISA bridge: Intel Corporation Panther Point LPC Controller (rev 04)
Subsystem: Dell Device 0577
Flags: bus master, medium devsel, latency 0
Capabilities: [e0] Vendor Specific Information: Len=0c <?>
Kernel modules: iTCO_wdt
00:1f.2 SATA controller: Intel Corporation Panther Point 6 port SATA Controller [AHCI mode] (rev 04) (prog-if 01 [AHCI 1.0])
Subsystem: Dell Device 0577
Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 40
I/O ports at f0d0 [size=8]
I/O ports at f0c0 [size=4]
I/O ports at f0b0 [size=8]
I/O ports at f0a0 [size=4]
I/O ports at f060 [size=32]
Memory at f7c36000 (32-bit, non-prefetchable) [size=2K]
Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [70] Power Management version 3
Capabilities: [a8] SATA HBA v1.0
Capabilities: [b0] PCI Advanced Features
Kernel driver in use: ahci
00:1f.3 SMBus: Intel Corporation Panther Point SMBus Controller (rev 04)
Subsystem: Dell Device 0577
Flags: medium devsel, IRQ 10
Memory at f7c35000 (64-bit, non-prefetchable) [size=256]
I/O ports at f040 [size=32]
Kernel modules: i2c-i801