커널을 4.19로 업그레이드한 후에도 USB-C AlternateMode가 여전히 작동하지 않습니다.

한동안 저는 우분투 18.04를 실행하는 hp-envy-13에서 외부 모니터를 사용하려고 노력해 왔습니다. 커널 4.19가 지원될 것이라고 생각했지만 여전히 작동하지 않는 것 같습니다. 어댑터(USB-C-VGA)가 내 Macbook에서 제대로 작동하여 케이블/어댑터 문제를 배제하지만 우분투에서는 인식되지 않습니다.

여기서 뭔가 빠졌나요?

    $ uname -a
    Linux HP-ENVY-Laptop-13-ad1xx 4.19.0-041900-generic #201810221809 SMP Mon Oct 22 22:11:45 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux


    $ lsb_release -a
    No LSB modules are available.
    Distributor ID: Ubuntu
    Description:    Ubuntu 18.04.1 LTS
    Release:    18.04
    Codename:   bionic


    $ lspci -d ::0c03 -k
    00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller (rev 21)
Subsystem: Hewlett-Packard Company Sunrise Point-LP USB 3.0 xHCI Controller
Kernel driver in use: xhci_hcd


    $ lspci -vt
-[0000:00]-+-00.0  Intel Corporation Xeon E3-1200 v6/7th Gen Core Processor Host Bridge/DRAM Registers
       +-02.0  Intel Corporation UHD Graphics 620
       +-04.0  Intel Corporation Skylake Processor Thermal Subsystem
       +-08.0  Intel Corporation Skylake Gaussian Mixture Model
       +-14.0  Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller
       +-14.2  Intel Corporation Sunrise Point-LP Thermal subsystem
       +-15.0  Intel Corporation Sunrise Point-LP Serial IO I2C Controller #0
       +-16.0  Intel Corporation Sunrise Point-LP CSME HECI #1
       +-17.0  Intel Corporation Sunrise Point-LP SATA Controller [AHCI mode]
       +-1c.0-[01]----00.0  Alcor Micro Device 6625
       +-1c.5-[02]----00.0  Intel Corporation Wireless 7265
       +-1d.0-[03]----00.0  Toshiba America Info Systems Device 0116
       +-1f.0  Intel Corporation Device 9d4e
       +-1f.2  Intel Corporation Sunrise Point-LP PMC
       +-1f.3  Intel Corporation Sunrise Point-LP HD Audio
       \-1f.4  Intel Corporation Sunrise Point-LP SMBus