Vários monitores via Dell DisplayLink não funcionam em 18.04

Question

Acabei de instalar o Ubuntu 18.04 (estava usando o Elementary OS antes) no meu Dell Latitude, que tem dois monitores conectados por meio de um dock DisplayLink. Eu consegui três telas (tela de laptop + duas externas) trabalhando no Elemantary OS depois de instalar os drivers do DisplayLink no site da Dell. No Ubuntu 18.04 não estou vendo os monitores externos, apesar de ter conseguido instalar os drivers DispplayLink.

Eu tentei com drivers proprietários da NVIDIA (nvidia-driver-390) e com o X.Org nouveau (xserver-xorg-video-nouveau).

EDIT (out 2018): Instalado o último driver Dell DisplayLink que diz que está trabalhando com o Ubuntu 18.04 de link A questão permanece.

Outro problema, possivelmente relacionado: Eu só posso inicializar no Ubuntu usando o "Ubuntu on Wayland", o Ubuntu padrão apenas volta para a tela de login depois que eu digito minha senha.

$ lspci -k
00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v6/7th Gen Core Processor Host Bridge/DRAM Registers (rev 05)
    Subsystem: Dell Xeon E3-1200 v6/7th Gen Core Processor Host Bridge/DRAM Registers
00:01.0 PCI bridge: Intel Corporation Skylake PCIe Controller (x16) (rev 05)
    Kernel driver in use: pcieport
    Kernel modules: shpchp
00:01.1 PCI bridge: Intel Corporation Skylake PCIe Controller (x8) (rev 05)
    Kernel driver in use: pcieport
    Kernel modules: shpchp
00:02.0 VGA compatible controller: Intel Corporation Device 591b (rev 04)
    Subsystem: Dell Device 07d0
    Kernel driver in use: i915
    Kernel modules: i915
00:04.0 Signal processing controller: Intel Corporation Skylake Processor Thermal Subsystem (rev 05)
    Subsystem: Dell Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem
    Kernel driver in use: proc_thermal
    Kernel modules: processor_thermal_device
00:14.0 USB controller: Intel Corporation Sunrise Point-H USB 3.0 xHCI Controller (rev 31)
    Subsystem: Dell Sunrise Point-H USB 3.0 xHCI Controller
    Kernel driver in use: xhci_hcd
00:14.2 Signal processing controller: Intel Corporation Sunrise Point-H Thermal subsystem (rev 31)
    Subsystem: Dell Sunrise Point-H Thermal subsystem
    Kernel driver in use: intel_pch_thermal
    Kernel modules: intel_pch_thermal
00:15.0 Signal processing controller: Intel Corporation Sunrise Point-H Serial IO I2C Controller #0 (rev 31)
    Subsystem: Dell Sunrise Point-H Serial IO I2C Controller
    Kernel driver in use: intel-lpss
    Kernel modules: intel_lpss_pci
00:15.1 Signal processing controller: Intel Corporation Sunrise Point-H Serial IO I2C Controller #1 (rev 31)
    Subsystem: Dell Sunrise Point-H Serial IO I2C Controller
    Kernel driver in use: intel-lpss
    Kernel modules: intel_lpss_pci
00:16.0 Communication controller: Intel Corporation Sunrise Point-H CSME HECI #1 (rev 31)
    Subsystem: Dell Sunrise Point-H CSME HECI
    Kernel driver in use: mei_me
    Kernel modules: mei_me
00:17.0 RAID bus controller: Intel Corporation SATA Controller [RAID mode] (rev 31)
    Subsystem: Dell SATA Controller [RAID mode]
    Kernel driver in use: ahci
    Kernel modules: ahci
00:1c.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #2 (rev f1)
    Kernel driver in use: pcieport
    Kernel modules: shpchp
00:1c.2 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #3 (rev f1)
    Kernel driver in use: pcieport
    Kernel modules: shpchp
00:1c.4 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #5 (rev f1)
    Kernel driver in use: pcieport
    Kernel modules: shpchp
00:1f.0 ISA bridge: Intel Corporation Sunrise Point-H LPC Controller (rev 31)
    Subsystem: Dell Sunrise Point-H LPC Controller
00:1f.2 Memory controller: Intel Corporation Sunrise Point-H PMC (rev 31)
    Subsystem: Dell Sunrise Point-H PMC
00:1f.3 Audio device: Intel Corporation CM238 HD Audio Controller (rev 31)
    Subsystem: Dell CM238 HD Audio Controller
    Kernel driver in use: snd_hda_intel
    Kernel modules: snd_hda_intel
00:1f.4 SMBus: Intel Corporation Sunrise Point-H SMBus (rev 31)
    Subsystem: Dell Sunrise Point-H SMBus
    Kernel modules: i2c_i801
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (5) I219-LM (rev 31)
    Subsystem: Dell Ethernet Connection (5) I219-LM
    Kernel driver in use: e1000e
    Kernel modules: e1000e
02:00.0 3D controller: NVIDIA Corporation GM108M [GeForce 930MX] (rev a2)
    Subsystem: Dell GM108M [GeForce 930MX]
    Kernel driver in use: nouveau
    Kernel modules: nvidiafb, nouveau, nvidia_drm, nvidia
03:00.0 Network controller: Intel Corporation Wireless 8265 / 8275 (rev 78)
    Subsystem: Intel Corporation Wireless 8265 / 8275
    Kernel driver in use: iwlwifi
    Kernel modules: iwlwifi
04:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS525A PCI Express Card Reader (rev 01)
    Subsystem: Dell RTS525A PCI Express Card Reader
    Kernel driver in use: rtsx_pci
    Kernel modules: rtsx_pci

    

Answer 1

Descobrimos que usar Wayland foi o culpado, possivelmente combinado com os drivers DisplayLink. Instalando os drivers mais recentes (4.4) do link e alternando de volta para "Ubuntu" (o padrão) na tela de login resolvida a questão.