Similar here, issue with power management.
While dell 7530 with 35gb and 18.04.
Most of the time doesn't boot for powermanagement issue. Most of the time I have to powercycle again, sometimes boots but i2c devices aren't enabled (touchpad), 15% everything works.


[  106.412564] usb usb3: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.00
[  106.412565] usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[  106.412566] usb usb3: Product: xHCI Host Controller
[  106.412567] usb usb3: Manufacturer: Linux 5.0.0-37-generic xhci-hcd
[  106.412567] usb usb3: SerialNumber: 0000:3a:00.0
[  106.412661] hub 3-0:1.0: USB hub found
[  106.412670] hub 3-0:1.0: 2 ports detected
[  106.413110] xhci_hcd 0000:3a:00.0: xHCI Host Controller
[  106.413112] xhci_hcd 0000:3a:00.0: new USB bus registered, assigned bus number 4
[  106.413115] xhci_hcd 0000:3a:00.0: Host supports USB 3.1 Enhanced SuperSpeed
[  106.413140] usb usb4: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.00
[  106.413141] usb usb4: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[  106.413141] usb usb4: Product: xHCI Host Controller
[  106.413142] usb usb4: Manufacturer: Linux 5.0.0-37-generic xhci-hcd
[  106.413142] usb usb4: SerialNumber: 0000:3a:00.0
[  106.413225] hub 4-0:1.0: USB hub found
[  106.413233] hub 4-0:1.0: 2 ports detected
[  107.693926] pcieport 0000:00:1c.0: PCI bridge to [bus 03-6d]
[  107.693929] pcieport 0000:00:1c.0:   bridge window [io  0x5000-0x8fff]
[  107.693934] pcieport 0000:00:1c.0:   bridge window [mem 0x84000000-0xb20fffff]
[  107.693938] pcieport 0000:00:1c.0:   bridge window [mem 0x4000000000-0x4049ffffff 64bit pref]
[  146.485226] pciehp 0000:00:1c.0:pcie004: Slot(4): Link Down
[  146.485227] pciehp 0000:00:1c.0:pcie004: Slot(4): Card not present
[  146.485236] pcieport 0000:04:04.0: Refused to change power state, currently in D3
[  146.485715] pcieport 0000:04:02.0: Refused to change power state, currently in D3
[  146.485908] xhci_hcd 0000:3a:00.0: Refused to change power state, currently in D3
[  146.565607] xhci_hcd 0000:3a:00.0: Refused to change power state, currently in D3
[  146.565645] xhci_hcd 0000:3a:00.0: Controller not ready at resume -19
[  146.565646] xhci_hcd 0000:3a:00.0: PCI post-resume error -19!
[  146.565648] xhci_hcd 0000:3a:00.0: HC died; cleaning up
[  146.565658] xhci_hcd 0000:3a:00.0: remove, state 4
[  146.565660] usb usb4: USB disconnect, device number 1
[  146.565848] xhci_hcd 0000:3a:00.0: USB bus 4 deregistered
[  146.565851] xhci_hcd 0000:3a:00.0: remove, state 4
[  146.565854] usb usb3: USB disconnect, device number 1
[  146.566001] xhci_hcd 0000:3a:00.0: Host halt failed, -19
[  146.566003] xhci_hcd 0000:3a:00.0: Host not accessible, reset failed.
[  146.566061] xhci_hcd 0000:3a:00.0: USB bus 3 deregistered
[  146.566206] pcieport 0000:04:01.0: Refused to change power state, currently in D3
[  147.066833] pci_bus 0000:05: busn_res: [bus 05] is released
[  147.066878] pci_bus 0000:06: busn_res: [bus 06-39] is released
[  147.081632] pci_bus 0000:3a: busn_res: [bus 3a] is released
[  147.081679] pci_bus 0000:3b: busn_res: [bus 3b-6d] is released
[  147.081706] pci_bus 0000:04: busn_res: [bus 04-6d] is released