我全新安装了 Ubuntu 20.04，但它无法识别我的第二台显示器
我已经执行了以下命令（我相信只有这些命令在 19.10 版本中有效）：
sudo apt update && sudo apt upgrade -y
sudo ubuntu-drivers autoinstall
我使用的视频驱动程序是 nvidia-driver-440
兰德
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 194mm
1920x1080 60.02*+ 60.01 59.97 59.96 59.93 48.03
1680x1050 59.95 59.88
1600x1024 60.17
1400x1050 59.98
1600x900 59.99 59.94 59.95 59.82
1280x1024 60.02
1440x900 59.89
1400x900 59.96 59.88
1280x960 60.00
1440x810 60.00 59.97
1368x768 59.88 59.85
1360x768 59.80 59.96
1280x800 59.99 59.97 59.81 59.91
1152x864 60.00
1280x720 60.00 59.99 59.86 59.74
1024x768 60.04 60.00
960x720 60.00
928x696 60.05
896x672 60.01
1024x576 59.95 59.96 59.90 59.82
960x600 59.93 60.00
960x540 59.96 59.99 59.63 59.82
800x600 60.00 60.32 56.25
840x525 60.01 59.88
864x486 59.92 59.57
800x512 60.17
700x525 59.98
800x450 59.95 59.82
640x512 60.02
720x450 59.89
700x450 59.96 59.88
640x480 60.00 59.94
720x405 59.51 58.99
684x384 59.88 59.85
680x384 59.80 59.96
640x400 59.88 59.98
576x432 60.06
640x360 59.86 59.83 59.84 59.32
512x384 60.00
512x288 60.00 59.92
480x270 59.63 59.82
400x300 60.32 56.34
432x243 59.92 59.57
320x240 60.05
360x202 59.51 59.13
320x180 59.84 59.32
DP-1 disconnected (normal left inverted right x axis y axis)
sudo lshw -C 显示
*-display
descrição: VGA compatible controller
produto: GP107M [GeForce GTX 1050 Ti Mobile]
fabricante: NVIDIA Corporation
ID físico: 0
informações do barramento: pci@0000:01:00.0
versão: a1
largura: 64 bits
clock: 33MHz
capacidades: pm msi pciexpress vga_controller bus_master cap_list rom
configuração: driver=nvidia latency=0
recursos: irq:16 memória:de000000-deffffff memória:c0000000-cfffffff memória:d0000000-d1ffffff porta de E/S:e000(tamanho=128) memória:df000000-df07ffff
*-display
descrição: VGA compatible controller
produto: HD Graphics 630
fabricante: Intel Corporation
ID físico: 2
informações do barramento: pci@0000:00:02.0
versão: 04
largura: 64 bits
clock: 33MHz
capacidades: pciexpress msi pm vga_controller bus_master cap_list rom
configuração: driver=i915 latency=0
recursos: irq:129 memória:dd000000-ddffffff memória:b0000000-bfffffff porta de E/S:f000(tamanho=64) memória:c0000-dffff
显示器在 Windows 下工作正常。
该电脑是戴尔 Inspiron 15 游戏机。
你能帮我解决这个问题吗？
编辑
添加可能有用的信息
dmesg（3.413227 错误）
[ 2.771157] input: Intel HID events as /devices/platform/INT33D5:00/input/input21
[ 2.771351] intel-hid INT33D5:00: platform supports 5 button array
[ 2.771385] input: Intel HID 5 button array as /devices/platform/INT33D5:00/input/input22
[ 2.818725] systemd[1]: Started Journal Service.
[ 2.824516] systemd-journald[357]: Received client request to flush runtime journal.
[ 2.861274] mei_me 0000:00:16.0: enabling device (0000 -> 0002)
[ 2.861718] mc: Linux media interface: v0.10
[ 2.867576] intel_rapl_common: Found RAPL domain package
[ 2.867577] intel_rapl_common: Found RAPL domain dram
[ 2.871051] proc_thermal 0000:00:04.0: Creating sysfs group for PROC_THERMAL_PCI
[ 2.877025] IPMI message handler: version 39.2
[ 2.877137] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[ 2.883760] ipmi device interface
[ 2.888182] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[ 2.891093] videodev: Linux video capture interface: v2.00
[ 2.894789] Bluetooth: Core ver 2.22
[ 2.894802] NET: Registered protocol family 31
[ 2.894802] Bluetooth: HCI device and connection manager initialized
[ 2.894805] Bluetooth: HCI socket layer initialized
[ 2.894807] Bluetooth: L2CAP socket layer initialized
[ 2.894810] Bluetooth: SCO socket layer initialized
[ 2.900899] dcdbas dcdbas: Dell Systems Management Base Driver (version 5.6.0-3.3)
[ 2.951677] RAPL PMU: API unit is 2^-32 Joules, 4 fixed counters, 655360 ms ovfl timer
[ 2.951678] RAPL PMU: hw unit of domain pp0-core 2^-14 Joules
[ 2.951679] RAPL PMU: hw unit of domain package 2^-14 Joules
[ 2.951680] RAPL PMU: hw unit of domain dram 2^-14 Joules
[ 2.951681] RAPL PMU: hw unit of domain pp1-gpu 2^-14 Joules
[ 2.962398] input: Dell WMI hotkeys as /devices/platform/PNP0C14:02/wmi_bus/wmi_bus-PNP0C14:02/9DBB5994-A997-11DA-B012-B622A1EF5492/input/input23
[ 2.963189] checking generic (b0000000 7f0000) vs hw (b0000000 10000000)
[ 2.963190] fb0: switching to inteldrmfb from VESA VGA
[ 2.964973] Console: switching to colour dummy device 80x25
[ 2.965012] i915 0000:00:02.0: vgaarb: deactivate vga console
[ 2.968898] usbcore: registered new interface driver btusb
[ 2.968925] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 2.968926] [drm] Driver supports precise vblank timestamp query.
[ 2.970976] i915 0000:00:02.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=none:owns=io+mem
[ 2.974394] [drm] Finished loading DMC firmware i915/kbl_dmc_ver1_04.bin (v1.4)
[ 3.012062] uvcvideo: Found UVC 1.00 device Integrated_Webcam_HD (1bcf:28c1)
[ 3.021359] i915 0000:00:02.0: [drm:intel_dp_aux_init_backlight_funcs [i915]] Panel advertises DPCD backlight support, but VBT disagrees. If your backlight controls don't work try booting with i915.enable_dpcd_backlight=1. If your machine needs this, please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
[ 3.030752] uvcvideo 1-12:1.0: Entity type for entity Extension 4 was not initialized!
[ 3.030754] uvcvideo 1-12:1.0: Entity type for entity Extension 3 was not initialized!
[ 3.030755] uvcvideo 1-12:1.0: Entity type for entity Processing 2 was not initialized!
[ 3.030756] uvcvideo 1-12:1.0: Entity type for entity Camera 1 was not initialized!
[ 3.030811] input: Integrated_Webcam_HD: Integrate as /devices/pci0000:00/0000:00:14.0/usb1/1-12/1-12:1.0/input/input24
[ 3.067420] snd_hda_intel 0000:00:1f.3: DSP detected with PCI class/subclass/prog-if info 0x040380
[ 3.138784] mei_hdcp 0000:00:16.0-b638ab7e-94e2-4ea2-a552-d1c54b627f04: bound 0000:00:02.0 (ops i915_hdcp_component_ops [i915])
[ 3.139119] intel_rapl_common: Found RAPL domain package
[ 3.139120] intel_rapl_common: Found RAPL domain core
[ 3.139121] intel_rapl_common: Found RAPL domain uncore
[ 3.139122] intel_rapl_common: Found RAPL domain dram
[ 3.139668] nvidia: loading out-of-tree module taints kernel.
[ 3.139675] nvidia: module license 'NVIDIA' taints kernel.
[ 3.139676] Disabling lock debugging due to kernel taint
[ 3.139719] snd_hda_intel 0000:01:00.1: enabling device (0000 -> 0002)
[ 3.139829] ath10k_pci 0000:03:00.0: pci irq msi oper_irq_mode 2 irq_mode 0 reset_mode 0
[ 3.140553] snd_hda_intel 0000:01:00.1: Disabling MSI
[ 3.140560] snd_hda_intel 0000:01:00.1: Handle vga_switcheroo audio client
[ 3.146572] cryptd: max_cpu_qlen set to 1000
[ 3.169953] usbcore: registered new interface driver uvcvideo
[ 3.169955] USB Video Class driver (1.1.1)
[ 3.180174] AVX2 version of gcm_enc/dec engaged.
[ 3.180175] AES CTR mode by8 optimization enabled
[ 3.180684] nvidia-nvlink: Nvlink Core is being initialized, major device number 236
[ 3.183871] nvidia 0000:01:00.0: enabling device (0004 -> 0007)
[ 3.186287] nvidia 0000:01:00.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=none:owns=none
[ 3.285843] NVRM: loading NVIDIA UNIX x86_64 Kernel Module 440.64 Fri Feb 21 01:17:26 UTC 2020
[ 3.293163] input: DLL0798:00 06CB:7E92 Mouse as /devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-2/i2c-DLL0798:00/0018:06CB:7E92.0001/input/input25
[ 3.293233] input: DLL0798:00 06CB:7E92 Touchpad as /devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-2/i2c-DLL0798:00/0018:06CB:7E92.0001/input/input26
[ 3.293294] hid-multitouch 0018:06CB:7E92.0001: input,hidraw0: I2C HID v1.00 Mouse [DLL0798:00 06CB:7E92] on i2c-DLL0798:00
[ 3.303291] nvidia-modeset: Loading NVIDIA Kernel Mode Setting Driver for UNIX platforms 440.64 Fri Feb 21 00:43:19 UTC 2020
[ 3.338157] [drm] [nvidia-drm] [GPU ID 0x00000100] Loading driver
[ 3.338159] [drm] Initialized nvidia-drm 0.0.0 20160202 for 0000:01:00.0 on minor 1
[ 3.356373] nvidia-uvm: Loaded the UVM driver, major device number 234.
[ 3.413227] [drm:lspcon_init [i915]] *ERROR* Failed to probe lspcon
[ 3.413265] [drm:intel_ddi_init [i915]] *ERROR* LSPCON init failed on port B
[ 3.416312] ath10k_pci 0000:03:00.0: qca6174 hw3.2 target 0x05030000 chip_id 0x00340aff sub 1028:0310
[ 3.416315] ath10k_pci 0000:03:00.0: kconfig debug 0 debugfs 1 tracing 1 dfs 0 testmode 0
[ 3.416738] ath10k_pci 0000:03:00.0: firmware ver WLAN.RM.4.4.1-00140-QCARMSWPZ-1 api 6 features wowlan,ignore-otp,mfp crc32 29eb8ca1
[ 3.433342] [drm] Initialized i915 1.6.0 20190822 for 0000:00:02.0 on minor 0
[ 3.438212] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no)
[ 3.439099] input: Video Bus as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input28
[ 3.439181] ACPI: Video Device [PEGP] (multi-head: no rom: yes post: no)
[ 3.439215] input: Video Bus as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:0a/LNXVIDEO:01/input/input29
[ 3.440445] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
[ 3.441626] fbcon: i915drmfb (fb0) is primary device
[ 3.441683] Console: switching to colour frame buffer device 240x67
[ 3.441717] i915 0000:00:02.0: fb0: i915drmfb frame buffer device
[ 3.448458] Adding 19492860k swap on /dev/sdb7. Priority:-2 extents:1 across:19492860k SSFS
[ 3.473358] EXT4-fs (sdb6): mounted filesystem with ordered data mode. Opts: (null)
[ 3.485236] ath10k_pci 0000:03:00.0: board_file api 2 bmi_id N/A crc32 4ac0889b
[ 3.503143] audit: type=1400 audit(1587828434.218:2): apparmor="STATUS" operation="profile_load" profile="unconfined" name="lsb_release" pid=781 comm="apparmor_parser"
[ 3.504026] audit: type=1400 audit(1587828434.218:3): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/bin/man" pid=774 comm="apparmor_parser"
[ 3.504029] audit: type=1400 audit(1587828434.218:4): apparmor="STATUS" operation="profile_load" profile="unconfined" name="man_filter" pid=774 comm="apparmor_parser"
[ 3.504031] audit: type=1400 audit(1587828434.218:5): apparmor="STATUS" operation="profile_load" profile="unconfined" name="man_groff" pid=774 comm="apparmor_parser"
[ 3.504469] audit: type=1400 audit(1587828434.222:6): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/snapd/snap-confine" pid=777 comm="apparmor_parser"
[ 3.504471] audit: type=1400 audit(1587828434.222:7): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/snapd/snap-confine//mount-namespace-capture-helper" pid=777 comm="apparmor_parser"
[ 3.507632] audit: type=1400 audit(1587828434.222:8): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=775 comm="apparmor_parser"
[ 3.507635] audit: type=1400 audit(1587828434.222:9): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/NetworkManager/nm-dhcp-helper" pid=775 comm="apparmor_parser"
[ 3.507637] audit: type=1400 audit(1587828434.222:10): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/connman/scripts/dhclient-script" pid=775 comm="apparmor_parser"
[ 3.556939] snd_hda_codec_realtek hdaudioC0D0: autoconfig for ALC3246: line_outs=2 (0x14/0x1b/0x0/0x0/0x0) type:speaker
[ 3.556941] snd_hda_codec_realtek hdaudioC0D0: speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
[ 3.556943] snd_hda_codec_realtek hdaudioC0D0: hp_outs=1 (0x21/0x0/0x0/0x0/0x0)
[ 3.556944] snd_hda_codec_realtek hdaudioC0D0: mono: mono_out=0x0
[ 3.556944] snd_hda_codec_realtek hdaudioC0D0: inputs:
[ 3.556946] snd_hda_codec_realtek hdaudioC0D0: Headset Mic=0x19
[ 3.556947] snd_hda_codec_realtek hdaudioC0D0: Headphone Mic=0x1a
[ 3.556949] snd_hda_codec_realtek hdaudioC0D0: Internal Mic=0x12
[ 3.567779] ath10k_pci 0000:03:00.0: unsupported HTC service id: 1536
[ 3.587279] ath10k_pci 0000:03:00.0: htt-ver 3.60 wmi-op 4 htt-op 3 cal otp max-sta 32 raw 0 hwcrypto 1
[ 3.604068] input: HDA Intel PCH Headphone Mic as /devices/pci0000:00/0000:00:1f.3/sound/card0/input30
[ 3.668427] ath: EEPROM regdomain: 0x6c
[ 3.668428] ath: EEPROM indicates we should expect a direct regpair map
[ 3.668439] ath: Country alpha2 being used: 00
[ 3.668440] ath: Regpair used: 0x6c
[ 3.671748] ath10k_pci 0000:03:00.0 wlp3s0: renamed from wlan0
[ 3.960890] input: HDA NVidia HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card1/input31
答案1
我在使用 nvidia RTX 2060 笔记本电脑 (MSI GS65) 时也遇到了同样的问题。通过 DisplayPort 连接的外接显示器在 ubuntu 设置中根本不显示，但如果我查看 nvidia 设置，则可以识别。某处存在断开连接。
我降级到 nvidia-435 驱动程序，它运行良好。有些东西没有用 440 驱动程序彻底检查/测试。现在就降级，看看是否有帮助。
答案2
我在笔记本电脑上遇到了同样的问题（戴尔 G5 5500，配备 NVIDIA RTX 2060 作为 GPU）。我通过以下方式解决了这个问题禁用安全启动在 BIOS 选项中。
答案3
我遇到了同样的问题：昨天我决定安装我的新笔记本电脑（带有 NVIDIA GPU 的 ThinkPad P72）。
首先我很高兴：安装 Ubuntu 20.04 时 NVIDIA GPU 没有问题。我很高兴，因为我在另一台笔记本电脑上的 Ubuntu 18.04 上遇到了这个问题：在那里，我不得不切换到默认驱动程序才能在系统上安装 Ubuntu 18.04，否则安装会突然冻结。
但是当我在家里启动 Ubuntu 20.04 并想将我的笔记本连接到外接显示器以方便使用时，常用的“Windows+P”快捷键不起作用，因为它无法检测到外接显示器。当我打开“设置-->显示”时，也没有第二台显示器
我的解决方案是点击“活动 --> 软件和更新 --> 附加驱动程序”，将 NVIDIA 驱动程序从 440 恢复到 435。此外，还需要重新启动，以便 Ubuntu 使用 435 驱动程序版本。
现在我可以在启动后使用“Windows+P”选择要使用的显示器，并且我现在正在使用外接显示器:)
因此看来 NVIDIA 驱动程序 440 必须更新才能更好地与 Ubuntu 20.04 配合使用。
答案4
我在我的笔记本电脑双卡（Dell G5 5587）Ubuntu 20.04 上遇到了同样的问题。
就我而言，这个问题已经解决了。我之前已经清除并禁用了 snapd（这就是错误）。
当我使用 NVIDIA 兼容驱动程序（例如 435、440、450）并以按需或性能模式使用时，会出现此问题
这就是问题所在，因为 ubuntu 20.04 使用组合包（经典 deb 和 snap）
就我而言，解决方案如下：
sudo apt install snapd
sudo snap install snap-store
sudo reboot
最后在“设置-显示”中，第二个显示器的所有选项（连接、镜像、单一）也会出现，并且 NVidia 可以再次工作