desktop visible upon opening laptop lid before showing login screen

[Aspen James]

When reopening the laptop lid, the desktop is shown for a short period before the lock screen/login screen is shown.

Steps to reproduce: close laptop lid and reopen

Ubuntu Mate 18.04

uname -a output: Linux aspen-XPS-MATE 4.15.0-20-generic #21-Ubuntu SMP Tue Apr 24 06:16:15 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

hwinfo --short: cpu:
                       Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz, 3480 MHz
                       Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz, 3440 MHz
                       Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz, 3380 MHz
                       Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz, 3433 MHz
                       Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz, 3421 MHz
                       Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz, 3262 MHz
                       Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz, 3436 MHz
                       Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz, 3380 MHz
keyboard:
  /dev/input/event20 Logitech Unifying Receiver
  /dev/input/event4 AT Translated Set 2 keyboard
mouse:
  /dev/input/mice Logitech Unifying Receiver
  /dev/input/mice Elan Microelectronics Touchscreen
  /dev/input/mice DLL07BE:01 06CB:7A13 Touchpad
monitor:
                       Y2XND LQ156D1 LCD Monitor
graphics card:
                       Intel VGA compatible controller
                       nVidia GP107M [GeForce GTX 1050 Mobile]
sound:
                       Intel Audio device
storage:
                       Samsung Electronics NVMe SSD Controller SM961/PM961
                       Intel Sunrise Point-H SATA Controller [AHCI mode]
network:
  wlp2s0 Qualcomm Atheros QCA6174 802.11ac Wireless Network Adapter
network interface:
  wlp2s0 Ethernet network interface
  lo Loopback network interface
  tun0 Network Interface
disk:
  /dev/nvme0n1 Samsung Electronics NVMe SSD Controller SM961/PM961
partition:
  /dev/nvme0n1p1 Partition
  /dev/nvme0n1p2 Partition
  /dev/nvme0n1p3 Partition
  /dev/nvme0n1p4 Partition
  /dev/nvme0n1p5 Partition
usb controller:
                       Intel Sunrise Point-H USB 3.0 xHCI Controller
bios:
                       BIOS
bridge:
                       Intel Sunrise Point-H PCI Express Root Port #15
                       Intel Host bridge
                       Intel Sunrise Point-H PCI Express Root Port #2
                       Intel Sunrise Point-H PCI Express Root Port #13
                       Intel Sunrise Point-H PCI Express Root Port #9
                       Intel Sunrise Point-H PCI Express Root Port #1
                       Intel Sunrise Point-H LPC Controller
                       Intel Skylake PCIe Controller (x16)
hub:
                       Linux Foundation 2.0 root hub
                       Linux Foundation 3.0 root hub
memory:
                       Main Memory
bluetooth:
                       Qualcomm Atheros Bluetooth Device
unknown:
                       FPU
                       DMA controller
                       PIC
                       Keyboard controller
                       Intel Sunrise Point-H Serial IO I2C Controller #0
                       Intel Sunrise Point-H Thermal subsystem
                       Intel Sunrise Point-H SMBus
                       Intel Sunrise Point-H PMC
                       Realtek RTS525A PCI Express Card Reader
                       Intel Sunrise Point-H Serial IO I2C Controller #1
                       Intel Skylake Processor Thermal Subsystem
                       Intel Sunrise Point-H CSME HECI #1
                       Validity Sensors Unclassified device
  /dev/input/event11 Microdia Integrated_Webcam_HD

[Douglas Silva (o-alquimista)]

I can reproduce on Xubuntu as well

[Launchpad Janitor (janitor)]

[Expired for Ubuntu MATE because there has been no activity for 60 days.]