Alright, I have a little more detail, but it's still largely a puzzle. My current machine state (expected to remain this way until the next reboot), is that any time I plug a USB device into a port under the xHCI controller in the TB18DC dock, the xHCI controller dies a horrible death.
This is 100% reproducible right now. Unbinding the xHCI driver and rebinding works, as does something firmer to the entire thunderbolt PCI chain and rescanning. Doing so results in every USB device plugged in at the time of the rebind/rescan working perfectly, until such time as I next plug a USB device in. That device can be on a port on the dock, or on a port on any hub connected to a port on the dock. I can remove the thunderbolt PCI devices software wise, unplug the dock from the laptop, unplug the dock from power, then reconnect the dock to power, plug it back into the laptop, and once everything comes back up I am again in a temporarily working state... Until I plug a USB device into the system. At which point it fails again, in exactly the same way. Given that a reboot will solve the problem for some time, this is starting to make me think that either A, there is something very wonky going on in Dell SMBIOS land, or B, there is something wonky going on somewhere in the kernel space. It being an issue with the dock itself seems difficult to support, given that the dock is getting a full power cycle and it's not changing anything, and yet a reboot of the laptop without a full power cycle of the dock seems to resolve the issue for a little while. Here are some more kernel messages of the death, this time with more debugging enabled: Feb 08 20:03:46 chimera kernel: xhci_hcd 0000:0c:00.0: // Ding dong! Feb 08 20:03:46 chimera kernel: xhci_hcd 0000:0c:00.0: Slot 3 output ctx = 0xaa5a13000 (dma) Feb 08 20:03:46 chimera kernel: xhci_hcd 0000:0c:00.0: Slot 3 input ctx = 0xacd98c000 (dma) Feb 08 20:03:46 chimera kernel: xhci_hcd 0000:0c:00.0: Set slot id 3 dcbaa entry 000000006f1f9598 to 0xaa5a13000 Feb 08 20:03:46 chimera kernel: usb 3-1.4: new full-speed USB device number 7 using xhci_hcd Feb 08 20:03:46 chimera kernel: xhci_hcd 0000:0c:00.0: Set root hub portnum to 3 Feb 08 20:03:46 chimera kernel: xhci_hcd 0000:0c:00.0: Set fake root hub portnum to 1 Feb 08 20:03:46 chimera kernel: xhci_hcd 0000:0c:00.0: udev->tt = 000000008fd0cd08 Feb 08 20:03:46 chimera kernel: xhci_hcd 0000:0c:00.0: udev->ttport = 0x4 Feb 08 20:03:46 chimera kernel: xhci_hcd 0000:0c:00.0: // Ding dong! Feb 08 20:03:46 chimera kernel: xhci_hcd 0000:0c:00.0: Successful setup context command Feb 08 20:03:46 chimera kernel: xhci_hcd 0000:0c:00.0: Op regs DCBAA ptr = 0x00000acbcc6000 Feb 08 20:03:46 chimera kernel: xhci_hcd 0000:0c:00.0: Slot ID 3 dcbaa entry @000000006f1f9598 = 0x00000aa5a13000 Feb 08 20:03:46 chimera kernel: xhci_hcd 0000:0c:00.0: Output Context DMA address = 0xaa5a13000 Feb 08 20:03:46 chimera kernel: xhci_hcd 0000:0c:00.0: Internal device address = 0 Feb 08 20:03:46 chimera kernel: xhci_hcd 0000:0c:00.0: Waiting for status stage event Feb 08 20:03:47 chimera kernel: xhci_hcd 0000:0c:00.0: Cancel URB 00000000b99abcb2, dev 1, ep 0x0, starting at offset 0xaa6cbddc0 Feb 08 20:03:47 chimera kernel: xhci_hcd 0000:0c:00.0: // Ding dong! Feb 08 20:03:52 chimera kernel: xhci_hcd 0000:0c:00.0: xHCI host not responding to stop endpoint command. Feb 08 20:03:52 chimera kernel: xhci_hcd 0000:0c:00.0: // Halt the HC Feb 08 20:03:52 chimera kernel: xhci_hcd 0000:0c:00.0: Host halt failed, -110 Feb 08 20:03:52 chimera kernel: xhci_hcd 0000:0c:00.0: xHCI host controller not responding, assume dead Feb 08 20:03:52 chimera kernel: xhci_hcd 0000:0c:00.0: Killing URBs for slot ID 1, ep index 0 Feb 08 20:03:52 chimera kernel: xhci_hcd 0000:0c:00.0: Killing URBs for slot ID 1, ep index 2 Feb 08 20:03:52 chimera kernel: xhci_hcd 0000:0c:00.0: Killing URBs for slot ID 2, ep index 0 Feb 08 20:03:52 chimera kernel: xhci_hcd 0000:0c:00.0: Killing URBs for slot ID 2, ep index 2 Feb 08 20:03:52 chimera kernel: xhci_hcd 0000:0c:00.0: Killing URBs for slot ID 3, ep index 0 Feb 08 20:03:52 chimera kernel: xhci_hcd 0000:0c:00.0: Killing URBs for slot ID 4, ep index 0 Feb 08 20:03:52 chimera kernel: xhci_hcd 0000:0c:00.0: Killing URBs for slot ID 4, ep index 2 Feb 08 20:03:52 chimera kernel: xhci_hcd 0000:0c:00.0: Killing URBs for slot ID 4, ep index 3 Feb 08 20:03:52 chimera kernel: r8152 4-1.2:1.0 eth0: Tx status -108 Feb 08 20:03:52 chimera kernel: r8152 4-1.2:1.0 eth0: Tx status -108 Feb 08 20:03:52 chimera kernel: r8152 4-1.2:1.0 eth0: Tx status -108 Feb 08 20:03:52 chimera kernel: r8152 4-1.2:1.0 eth0: Tx status -108 Feb 08 20:03:52 chimera kernel: xhci_hcd 0000:0c:00.0: Killing URBs for slot ID 4, ep index 6 Feb 08 20:03:52 chimera kernel: xhci_hcd 0000:0c:00.0: Killing URBs for slot ID 5, ep index 0 Feb 08 20:03:52 chimera kernel: xhci_hcd 0000:0c:00.0: Killing URBs for slot ID 5, ep index 2 Feb 08 20:03:52 chimera kernel: xhci_hcd 0000:0c:00.0: Killing URBs for slot ID 5, ep index 10 Feb 08 20:03:52 chimera kernel: xhci_hcd 0000:0c:00.0: Killing URBs for slot ID 5, ep index 15 Feb 08 20:03:52 chimera kernel: xhci_hcd 0000:0c:00.0: Killing URBs for slot ID 6, ep index 0 Feb 08 20:03:52 chimera kernel: xhci_hcd 0000:0c:00.0: Killing URBs for slot ID 6, ep index 2 Feb 08 20:03:52 chimera kernel: xhci_hcd 0000:0c:00.0: Killing URBs for slot ID 7, ep index 0 Feb 08 20:03:52 chimera kernel: xhci_hcd 0000:0c:00.0: Killing URBs for slot ID 7, ep index 5 Feb 08 20:03:52 chimera kernel: xhci_hcd 0000:0c:00.0: Killing URBs for slot ID 7, ep index 8 Feb 08 20:03:52 chimera kernel: xhci_hcd 0000:0c:00.0: HC died; cleaning up Feb 08 20:03:52 chimera kernel: xhci_hcd 0000:0c:00.0: xHCI host controller is dead. Of note, sometimes when I kick this off I get CPU soft lockup watchdog notices, I need to do some more digging, but this _seems_ to indicate either a lock being held deep inside some stuff, or that this really is a SMBIOS issue where the SMBIOS is going out to lunch for a little bit. If this does prove to be a SMM/SMBIOS issue, then there will likely be nothing at all that we can do to fix it except for bugging Dell. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1766076 Title: USB over thunderbolt turns off every once in a while Status in Dell Sputnik: New Status in linux package in Ubuntu: Incomplete Bug description: I'm using a USB hub in the Dell TB16 (240W) connected to a Dell Precision 5520 using Thunderbolt 3. Every so often (can be several times in an hour if I'm really unlucky, some days it is less of a problem), the USB hub disconnects from the computer and the devices connected to it lose power and stop responding. disconnecting and reconnecting the USB cables has no effect. I can restore functionality by instructing the xhci_hcd driver to unbind from the USB 3.0 Host Controller in the dock and to rebind to it using the commands: echo -n "0000:0e:00.0" > /sys/bus/pci/drivers/xhci_hcd/unbind echo -n "0000:0e:00.0" > /sys/bus/pci/drivers/xhci_hcd/bind Here's the dmesg output when the USB hub disconnects: 279278.102701] xhci_hcd 0000:0e:00.0: ERROR unknown event type 15 [279283.021802] xhci_hcd 0000:0e:00.0: xHCI host not responding to stop endpoint command. [279283.022145] xhci_hcd 0000:0e:00.0: xHCI host controller not responding, assume dead [279283.022161] r8152 4-1.2:1.0 enxd481d731b2b1: Tx status -108 [279283.022199] xhci_hcd 0000:0e:00.0: HC died; cleaning up [279283.022227] usb 3-1.5: Failed to suspend device, error -22 [279283.022234] usb 3-1: USB disconnect, device number 2 [279283.022235] usb 3-1.1: USB disconnect, device number 3 [279283.022236] usb 3-1.1.1: USB disconnect, device number 5 [279283.022237] usb 3-1.1.1.1: USB disconnect, device number 8 [279283.022238] usb 3-1.1.1.1.4: USB disconnect, device number 11 [279283.022326] usb 4-1: USB disconnect, device number 2 [279283.022328] usb 4-1.1: USB disconnect, device number 3 [279283.022329] usb 4-1.1.1: USB disconnect, device number 5 [279283.022998] usb 4-1.2: USB disconnect, device number 4 [279283.191217] usb 3-1.1.1.5: USB disconnect, device number 9 [279283.191730] usb 3-1.1.3: USB disconnect, device number 6 [279283.260810] usb 3-1.1.5: USB disconnect, device number 7 [279283.261350] usb 3-1.5: USB disconnect, device number 4 Here's dmesg output during the USB host controller reset: 279389.813889] xhci_hcd 0000:0e:00.0: remove, state 1 [279389.813894] usb usb4: USB disconnect, device number 1 [279389.814103] xhci_hcd 0000:0e:00.0: USB bus 4 deregistered [279389.814107] xhci_hcd 0000:0e:00.0: remove, state 1 [279389.814110] usb usb3: USB disconnect, device number 1 [279389.881651] xhci_hcd 0000:0e:00.0: USB bus 3 deregistered [279389.882133] xhci_hcd 0000:0e:00.0: xHCI Host Controller [279389.882138] xhci_hcd 0000:0e:00.0: new USB bus registered, assigned bus number 3 [279389.949391] xhci_hcd 0000:0e:00.0: hcc params 0x0200e081 hci version 0x100 quirks 0x10000410 [279389.949979] usb usb3: New USB device found, idVendor=1d6b, idProduct=0002 [279389.949981] usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [279389.949982] usb usb3: Product: xHCI Host Controller [279389.949983] usb usb3: Manufacturer: Linux 4.15.0-15-generic xhci-hcd [279389.949983] usb usb3: SerialNumber: 0000:0e:00.0 [279389.950117] hub 3-0:1.0: USB hub found [279389.950135] hub 3-0:1.0: 2 ports detected [279389.950310] xhci_hcd 0000:0e:00.0: xHCI Host Controller [279389.950314] xhci_hcd 0000:0e:00.0: new USB bus registered, assigned bus number 4 [279389.951098] usb usb4: We don't know the algorithms for LPM for this host, disabling LPM. [279389.951117] usb usb4: New USB device found, idVendor=1d6b, idProduct=0003 [279389.951119] usb usb4: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [279389.951120] usb usb4: Product: xHCI Host Controller [279389.951121] usb usb4: Manufacturer: Linux 4.15.0-15-generic xhci-hcd [279389.951122] usb usb4: SerialNumber: 0000:0e:00.0 [279389.951306] hub 4-0:1.0: USB hub found [279389.951321] hub 4-0:1.0: 2 ports detected [279390.299396] usb 4-1: new SuperSpeed USB device number 2 using xhci_hcd [279390.321750] usb 4-1: New USB device found, idVendor=0424, idProduct=5807 [279390.321752] usb 4-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [279390.321753] usb 4-1: Product: USB5807 Hub [279390.321754] usb 4-1: Manufacturer: Microchip [279390.341684] hub 4-1:1.0: USB hub found [279390.342312] hub 4-1:1.0: 7 ports detected [279390.513286] usb 3-1: new high-speed USB device number 2 using xhci_hcd [279390.750013] usb 3-1: New USB device found, idVendor=0424, idProduct=2807 [279390.750015] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [279390.750016] usb 3-1: Product: USB2807 Hub [279390.750017] usb 3-1: Manufacturer: Microchip [279390.769651] hub 3-1:1.0: USB hub found [279390.769793] hub 3-1:1.0: 7 ports detected [279390.839440] usb 4-1.1: new SuperSpeed USB device number 3 using xhci_hcd [279390.861567] usb 4-1.1: New USB device found, idVendor=0424, idProduct=5734 [279390.861568] usb 4-1.1: New USB device strings: Mfr=2, Product=3, SerialNumber=0 [279390.861569] usb 4-1.1: Product: USB5734 [279390.861570] usb 4-1.1: Manufacturer: Microchip Tech [279390.881472] hub 4-1.1:1.0: USB hub found [279390.882171] hub 4-1.1:1.0: 5 ports detected [279390.991442] usb 4-1.2: new SuperSpeed USB device number 4 using xhci_hcd [279391.015809] usb 4-1.2: New USB device found, idVendor=0bda, idProduct=8153 [279391.015811] usb 4-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=6 [279391.015812] usb 4-1.2: Product: USB 10/100/1000 LAN [279391.015813] usb 4-1.2: Manufacturer: Realtek [279391.015814] usb 4-1.2: SerialNumber: 000001000000 [279391.089207] usb 3-1.1: new high-speed USB device number 3 using xhci_hcd [279391.211462] usb 3-1.1: New USB device found, idVendor=0424, idProduct=2734 [279391.211481] usb 3-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [279391.211482] usb 3-1.1: Product: USB2734 [279391.211483] usb 3-1.1: Manufacturer: Microchip Tech [279391.231366] hub 3-1.1:1.0: USB hub found [279391.231502] hub 3-1.1:1.0: 5 ports detected [279391.302796] usb 4-1.2: reset SuperSpeed USB device number 4 using xhci_hcd [279391.355371] usb 4-1.2: Dell TB16 Dock, disable RX aggregation [279391.370639] r8152 4-1.2:1.0 (unnamed net_device) (uninitialized): Using pass-thru MAC addr d4:81:d7:31:b2:b1 [279391.401126] usb 3-1.5: new high-speed USB device number 4 using xhci_hcd [279391.425377] r8152 4-1.2:1.0 eth0: v1.09.9 [279391.588750] usb 3-1.5: New USB device found, idVendor=0bda, idProduct=4014 [279391.588752] usb 3-1.5: New USB device strings: Mfr=3, Product=1, SerialNumber=2 [279391.588754] usb 3-1.5: Product: USB Audio [279391.588755] usb 3-1.5: Manufacturer: Generic [279391.588757] usb 3-1.5: SerialNumber: 200901010001 [279391.663127] usb 4-1.1.1: new SuperSpeed USB device number 5 using xhci_hcd [279391.685637] usb 4-1.1.1: New USB device found, idVendor=0424, idProduct=5734 [279391.685639] usb 4-1.1.1: New USB device strings: Mfr=2, Product=3, SerialNumber=0 [279391.685640] usb 4-1.1.1: Product: USB5734 [279391.685641] usb 4-1.1.1: Manufacturer: Microchip Tech [279391.812609] hub 4-1.1.1:1.0: USB hub found [279391.813185] hub 4-1.1.1:1.0: 5 ports detected [279391.973147] usb 3-1.1.1: new high-speed USB device number 5 using xhci_hcd [279392.095383] usb 3-1.1.1: New USB device found, idVendor=0424, idProduct=2734 [279392.095386] usb 3-1.1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [279392.095388] usb 3-1.1.1: Product: USB2734 [279392.095389] usb 3-1.1.1: Manufacturer: Microchip Tech [279392.104109] r8152 4-1.2:1.0 enxd481d731b2b1: renamed from eth0 [279392.165057] IPv6: ADDRCONF(NETDEV_UP): enxd481d731b2b1: link is not ready [279392.187087] IPv6: ADDRCONF(NETDEV_UP): enxd481d731b2b1: link is not ready [279392.398705] hub 3-1.1.1:1.0: USB hub found [279392.398894] hub 3-1.1.1:1.0: 5 ports detected [279392.625122] usb 3-1.1.3: new full-speed USB device number 6 using xhci_hcd [279392.884608] usb 3-1.1.3: New USB device found, idVendor=046d, idProduct=c52b [279392.884609] usb 3-1.1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [279392.884610] usb 3-1.1.3: Product: USB Receiver [279392.884611] usb 3-1.1.3: Manufacturer: Logitech [279392.934819] logitech-djreceiver 0003:046D:C52B.0091: hiddev1,hidraw3: USB HID v1.11 Device [Logitech USB Receiver] on usb-0000:0e:00.0-1.1.3/input2 [279393.062222] logitech-hidpp-device 0003:046D:402D.0092: hidraw4: USB HID v1.11 Keyboard [Logitech M560] on usb-0000:0e:00.0-1.1.3:1 [279393.133173] usb 3-1.1.5: new high-speed USB device number 7 using xhci_hcd [279393.260962] usb 3-1.1.5: New USB device found, idVendor=0424, idProduct=274c [279393.260965] usb 3-1.1.5: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [279393.260966] usb 3-1.1.5: Product: Hub Controller [279393.260967] usb 3-1.1.5: Manufacturer: Microchip Tech [279393.337238] usb 3-1.1.1.1: new high-speed USB device number 8 using xhci_hcd [279393.463217] usb 3-1.1.1.1: New USB device found, idVendor=05e3, idProduct=0608 [279393.463236] usb 3-1.1.1.1: New USB device strings: Mfr=0, Product=1, SerialNumber=0 [279393.463237] usb 3-1.1.1.1: Product: USB2.0 Hub [279393.839721] hid-generic 0003:0424:274C.0093: hiddev2,hidraw5: USB HID v1.10 Device [Microchip Tech Hub Controller] on usb-0000:0e:00.0-1.1.5/input0 [279393.857686] hub 3-1.1.1.1:1.0: USB hub found [279393.858162] hub 3-1.1.1.1:1.0: 4 ports detected [279393.985185] usb 3-1.1.1.5: new high-speed USB device number 9 using xhci_hcd Software: Ubuntu bionic beta Uname: Linux xxxxx 4.15.0-15-generic #16-Ubuntu SMP Wed Apr 4 13:58:14 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux lspci: 00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v6/7th Gen Core Processor Host Bridge/DRAM Registers (rev 05) 00:01.0 PCI bridge: Intel Corporation Skylake PCIe Controller (x16) (rev 05) 00:02.0 VGA compatible controller: Intel Corporation Device 591b (rev 04) 00:04.0 Signal processing controller: Intel Corporation Skylake Processor Thermal Subsystem (rev 05) 00:14.0 USB controller: Intel Corporation Sunrise Point-H USB 3.0 xHCI Controller (rev 31) 00:14.2 Signal processing controller: Intel Corporation Sunrise Point-H Thermal subsystem (rev 31) 00:15.0 Signal processing controller: Intel Corporation Sunrise Point-H Serial IO I2C Controller #0 (rev 31) 00:15.1 Signal processing controller: Intel Corporation Sunrise Point-H Serial IO I2C Controller #1 (rev 31) 00:16.0 Communication controller: Intel Corporation Sunrise Point-H CSME HECI #1 (rev 31) 00:17.0 SATA controller: Intel Corporation Sunrise Point-H SATA controller [AHCI mode] (rev 31) 00:1c.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #1 (rev f1) 00:1c.1 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #2 (rev f1) 00:1d.0 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #9 (rev f1) 00:1d.4 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #13 (rev f1) 00:1d.6 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #15 (rev f1) 00:1f.0 ISA bridge: Intel Corporation Sunrise Point-H LPC Controller (rev 31) 00:1f.2 Memory controller: Intel Corporation Sunrise Point-H PMC (rev 31) 00:1f.3 Audio device: Intel Corporation CM238 HD Audio Controller (rev 31) 00:1f.4 SMBus: Intel Corporation Sunrise Point-H SMBus (rev 31) 01:00.0 3D controller: NVIDIA Corporation GM107GLM [Quadro M1200 Mobile] (rev ff) 02:00.0 Network controller: Qualcomm Atheros QCA6174 802.11ac Wireless Network Adapter (rev 32) 03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS525A PCI Express Card Reader (rev 01) 04:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller SM961/PM961 06:00.0 PCI bridge: Intel Corporation DSL6340 Thunderbolt 3 Bridge [Alpine Ridge 2C 2015] 07:00.0 PCI bridge: Intel Corporation DSL6340 Thunderbolt 3 Bridge [Alpine Ridge 2C 2015] 07:01.0 PCI bridge: Intel Corporation DSL6340 Thunderbolt 3 Bridge [Alpine Ridge 2C 2015] 07:02.0 PCI bridge: Intel Corporation DSL6340 Thunderbolt 3 Bridge [Alpine Ridge 2C 2015] 08:00.0 System peripheral: Intel Corporation DSL6340 Thunderbolt 3 NHI [Alpine Ridge 2C 2015] 09:00.0 PCI bridge: Intel Corporation DSL6540 Thunderbolt 3 Bridge [Alpine Ridge 4C 2015] 0a:01.0 PCI bridge: Intel Corporation DSL6540 Thunderbolt 3 Bridge [Alpine Ridge 4C 2015] 0a:04.0 PCI bridge: Intel Corporation DSL6540 Thunderbolt 3 Bridge [Alpine Ridge 4C 2015] 0c:00.0 PCI bridge: Intel Corporation DSL6540 Thunderbolt 3 Bridge [Alpine Ridge 4C 2015] 0d:01.0 PCI bridge: Intel Corporation DSL6540 Thunderbolt 3 Bridge [Alpine Ridge 4C 2015] 0d:04.0 PCI bridge: Intel Corporation DSL6540 Thunderbolt 3 Bridge [Alpine Ridge 4C 2015] 0e:00.0 USB controller: ASMedia Technology Inc. ASM1042A USB 3.0 Host Controller --- ApportVersion: 2.20.9-0ubuntu5 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/pcmC0D0p: odeda 2692 F...m pulseaudio /dev/snd/controlC0: odeda 2692 F.... pulseaudio CurrentDesktop: KDE DistroRelease: Ubuntu 18.04 HibernationDevice: RESUME=UUID=48b9dbd0-5260-48d5-bf45-a3785e48227b InstallationDate: Installed on 2017-08-17 (247 days ago) InstallationMedia: Kubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170725) Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 003: ID 0cf3:e007 Atheros Communications, Inc. Bus 001 Device 004: ID 0c45:6713 Microdia Bus 001 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: Dell Inc. Precision 5520 Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-15-generic.efi.signed root=UUID=5abbb78f-aade-4e35-b206-816fb83c5e6e ro rootflags=subvol=@ quiet splash acpi_osi=!Windows\\x202013 acpi_osi=Linux nogpumanager intel_iommu=on pcie_port_pm=off vt.handoff=1 ProcVersionSignature: Ubuntu 4.15.0-15.16-generic 4.15.15 RelatedPackageVersions: linux-restricted-modules-4.15.0-15-generic N/A linux-backports-modules-4.15.0-15-generic N/A linux-firmware 1.173 Tags: bionic Uname: Linux 4.15.0-15-generic x86_64 UpgradeStatus: Upgraded to bionic on 2018-04-08 (14 days ago) UserGroups: adm bumblebee cdrom dip docker libvirt lpadmin lxd plugdev sambashare sudo wireshark _MarkForUpload: True dmi.bios.date: 01/25/2018 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.7.1 dmi.board.name: 0R6JFH dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 10 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.7.1:bd01/25/2018:svnDellInc.:pnPrecision5520:pvr:rvnDellInc.:rn0R6JFH:rvrA00:cvnDellInc.:ct10:cvr: dmi.product.family: Precision dmi.product.name: Precision 5520 dmi.sys.vendor: Dell Inc. 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