Turned out to be a lightdm issue and an update fixed it. Therefore, this bug is invalid.
** Changed in: linux (Ubuntu) Status: Confirmed => Invalid -- 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/1566111 Title: suspending on Dell XPS 13 9350 causes a reboot Status in linux package in Ubuntu: Invalid Bug description: Either select suspend from the menu or close the lid. Upon re-opening the lid or pressing power to wake the laptop up, the system will reboot ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-16-generic 4.4.0-16.32 ProcVersionSignature: Ubuntu 4.4.0-16.32-generic 4.4.6 Uname: Linux 4.4.0-16-generic x86_64 ApportVersion: 2.20.1-0ubuntu1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: anmar 1379 F.... pulseaudio CurrentDesktop: Unity Date: Mon Apr 4 22:35:04 2016 HibernationDevice: RESUME=UUID=5dccb0a4-b2c7-4b32-bff8-bd0657b5158b InstallationDate: Installed on 2016-03-29 (6 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Beta amd64 (20160323) Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 003: ID 0bda:5682 Realtek Semiconductor Corp. Bus 001 Device 002: ID 0a5c:6412 Broadcom Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: Dell Inc. XPS 13 9350 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-16-generic.efi.signed root=UUID=18eebbfe-ef00-4ba8-afd6-172ae82427c1 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.4.0-16-generic N/A linux-backports-modules-4.4.0-16-generic N/A linux-firmware 1.157 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 03/01/2016 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.3.3 dmi.board.name: 07TYC2 dmi.board.vendor: Dell Inc. dmi.board.version: A01 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.3.3:bd03/01/2016:svnDellInc.:pnXPS139350:pvr:rvnDellInc.:rn07TYC2:rvrA01:cvnDellInc.:ct9:cvr: dmi.product.name: XPS 13 9350 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1566111/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp