Yea, it might be a hardware problem..

Good to know. So I'll close this issue then ;)

** Changed in: linux (Ubuntu)
       Status: Confirmed => Invalid

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  No USB support for Dell XPS 13 9370 running Bionic 18.04

Status in linux package in Ubuntu:

Bug description:
  I recently received an XPS 13 9370. After taking a backup for 16.04
  (in case this very thing happened), I installed the daily build of
  18.04 as it didn't really make sense for me to hold on to a distro
  that'll be replaced in a couple of months.

  I noticed there were a few Dell repositories in sources.list, but non
  of them have bionic endpoints (only xenial).

  I copied those, in case they would be useful and went to erasing the
  disk and installing 18.04. Everything seems to work fine, except the
  USB / Thunderbolt ports. Nothing I try works, whether it be USB or
  Thunderbolt 3.

  If I look in dmesg, I can see the controller is recognising something,
  but it never lands in userspace:

  [ 1807.837379] xhci_hcd 0000:39:00.0: Host supports USB 3.1 Enhanced 
  [ 1807.837410] usb usb4: New USB device found, idVendor=1d6b, idProduct=0003
  [ 1807.837412] usb usb4: New USB device strings: Mfr=3, Product=2, 
  [ 1807.837413] usb usb4: Product: xHCI Host Controller
  [ 1807.837414] usb usb4: Manufacturer: Linux 4.13.0-25-generic xhci-hcd
  [ 1807.837416] usb usb4: SerialNumber: 0000:39:00.0
  [ 1807.837549] hub 4-0:1.0: USB hub found
  [ 1807.837558] hub 4-0:1.0: 2 ports detected
  ApportVersion: 2.20.8-0ubuntu6
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 18.04
  InstallationDate: Installed on 2018-01-19 (10 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180118)
  Package: linux (not installed)
  Tags:  bionic wayland-session
  Uname: Linux 4.15.0-041500-generic x86_64
  UnreportableReason: The running kernel is not an Ubuntu kernel
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip libvirt lpadmin lxd plugdev sambashare sudo
  _MarkForUpload: True

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