Still happens in 18.04. Switching to Xorg fixed it for me.
$ sudo lshw
roland-zenbook
description: Convertible
product: UX461UN
vendor: ASUSTeK COMPUTER INC.
version: 1.0
serial: J1N0CX17A84604B
width: 64 bits
capabilities: smbios-3.0 dmi-3.0 smp vsyscall32
configuration: boot=normal chassis=convertible family=UX
uuid=4A314E30-4358-3137-4138-343630344241
*-core
description: Motherboard
product: UX461UN
vendor: ASUSTeK COMPUTER INC.
physical id: 0
version: 1.0
serial: QCCBKQ0JE80300258
slot: MIDDLE
*-firmware
description: BIOS
vendor: American Megatrends Inc.
physical id: 0
version: UX461UN.305
date: 12/04/2017
size: 64KiB
capacity: 8128KiB
capabilities: pci upgrade shadowing cdboot bootselect socketedrom edd
int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard
int14serial int17printer acpi usb smartbattery biosbootspecification uefi
*-memory
description: System Memory
physical id: 8
slot: System board or motherboard
size: 16GiB
*-bank:0
description: Row of chips LPDDR3 Synchronous Unbuffered
(Unregistered) 2133 MHz (0.5 ns)
product: K4EBE304EB-EGCG
vendor: Samsung
physical id: 0
serial: 55000000
slot: ChannelA-DIMM0
size: 8GiB
width: 64 bits
clock: 2133MHz (0.5ns)
*-bank:1
description: Row of chips LPDDR3 Synchronous Unbuffered
(Unregistered) 2133 MHz (0.5 ns)
product: K4EBE304EB-EGCG
vendor: Samsung
physical id: 1
serial: 55000000
slot: ChannelB-DIMM0
size: 8GiB
width: 64 bits
clock: 2133MHz (0.5ns)
*-cache:0
description: L1 cache
physical id: d
slot: L1 Cache
size: 256KiB
capacity: 256KiB
capabilities: synchronous internal write-back unified
configuration: level=1
*-cache:1
description: L2 cache
physical id: e
slot: L2 Cache
size: 1MiB
capacity: 1MiB
capabilities: synchronous internal write-back unified
configuration: level=2
*-cache:2
description: L3 cache
physical id: f
slot: L3 Cache
size: 8MiB
capacity: 8MiB
capabilities: synchronous internal write-back unified
configuration: level=3
*-cpu
description: CPU
product: Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz
vendor: Intel Corp.
physical id: 10
bus info: cpu@0
version: Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz
serial: To Be Filled By O.E.M.
slot: U3E1
size: 3544MHz
capacity: 4005MHz
width: 64 bits
clock: 100MHz
capabilities: x86-64 fpu fpu_exception wp vme de pse tsc msr pae mce
cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss
ht tm pbe syscall nx pdpe1gb rdtscp constant_tsc art arch_perfmon pebs bts
rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni
pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid
sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand
lahf_lm abm 3dnowprefetch cpuid_fault epb invpcid_single pti tpr_shadow vnmi
flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid mpx
rdseed adx smap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsaves dtherm ida
arat pln pts hwp hwp_notify hwp_act_window hwp_epp cpufreq
configuration: cores=4 enabledcores=4 threads=8
*-pci
description: Host bridge
product: Intel Corporation
vendor: Intel Corporation
physical id: 100
bus info: pci@0000:00:00.0
version: 08
width: 32 bits
clock: 33MHz
*-display
description: VGA compatible controller
product: Intel Corporation
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 07
width: 64 bits
clock: 33MHz
capabilities: pciexpress msi pm vga_controller bus_master cap_list
rom
configuration: driver=i915 latency=0
resources: irq:134 memory:ed000000-edffffff
memory:c0000000-cfffffff ioport:f000(size=64) memory:c0000-dffff
*-generic:0
description: Signal processing controller
product: Skylake Processor Thermal Subsystem
vendor: Intel Corporation
physical id: 4
bus info: pci@0000:00:04.0
version: 08
width: 64 bits
clock: 33MHz
capabilities: msi pm cap_list
configuration: driver=proc_thermal latency=0
resources: irq:16 memory:ef320000-ef327fff
*-generic:1
description: Non-VGA unclassified device
product: Intel Corporation
vendor: Intel Corporation
physical id: 13
bus info: pci@0000:00:13.0
version: 21
width: 64 bits
clock: 33MHz
capabilities: pm bus_master cap_list
configuration: driver=intel_ish_ipc latency=0
resources: irq:20 memory:ef337000-ef337fff
*-usb
description: USB controller
product: Sunrise Point-LP USB 3.0 xHCI Controller
vendor: Intel Corporation
physical id: 14
bus info: pci@0000:00:14.0
version: 21
width: 64 bits
clock: 33MHz
capabilities: pm msi xhci bus_master cap_list
configuration: driver=xhci_hcd latency=0
resources: irq:126 memory:ef310000-ef31ffff
*-usbhost:0
product: xHCI Host Controller
vendor: Linux 4.15.18-041518-generic xhci-hcd
physical id: 0
bus info: usb@1
logical name: usb1
version: 4.15
capabilities: usb-2.00
configuration: driver=hub slots=12 speed=480Mbit/s
*-usb:0
description: Video
product: USB2.0 HD UVC WebCam
vendor: Azurewave
physical id: 5
bus info: usb@1:5
version: 17.04
serial: 0x0001
capabilities: usb-2.00
configuration: driver=uvcvideo maxpower=500mA speed=480Mbit/s
*-usb:1
description: Bluetooth wireless interface
vendor: Intel Corp.
physical id: 8
bus info: usb@1:8
version: 0.10
capabilities: bluetooth usb-2.00
configuration: driver=btusb maxpower=100mA speed=12Mbit/s
*-usbhost:1
product: xHCI Host Controller
vendor: Linux 4.15.18-041518-generic xhci-hcd
physical id: 1
bus info: usb@2
logical name: usb2
version: 4.15
capabilities: usb-3.00
configuration: driver=hub slots=6 speed=5000Mbit/s
*-generic:2
description: Signal processing controller
product: Sunrise Point-LP Thermal subsystem
vendor: Intel Corporation
physical id: 14.2
bus info: pci@0000:00:14.2
version: 21
width: 64 bits
clock: 33MHz
capabilities: pm msi cap_list
configuration: driver=intel_pch_thermal latency=0
resources: irq:18 memory:ef336000-ef336fff
*-generic:3
description: Signal processing controller
product: Sunrise Point-LP Serial IO I2C Controller #0
vendor: Intel Corporation
physical id: 15
bus info: pci@0000:00:15.0
version: 21
width: 64 bits
clock: 33MHz
capabilities: pm bus_master cap_list
configuration: driver=intel-lpss latency=0
resources: irq:16 memory:ef335000-ef335fff
*-generic:4
description: Signal processing controller
product: Sunrise Point-LP Serial IO I2C Controller #1
vendor: Intel Corporation
physical id: 15.1
bus info: pci@0000:00:15.1
version: 21
width: 64 bits
clock: 33MHz
capabilities: pm bus_master cap_list
configuration: driver=intel-lpss latency=0
resources: irq:17 memory:ef334000-ef334fff
*-communication
description: Communication controller
product: Sunrise Point-LP CSME HECI #1
vendor: Intel Corporation
physical id: 16
bus info: pci@0000:00:16.0
version: 21
width: 64 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list
configuration: driver=mei_me latency=0
resources: irq:138 memory:ef333000-ef333fff
*-pci:0
description: PCI bridge
product: Intel Corporation
vendor: Intel Corporation
physical id: 1c
bus info: pci@0000:00:1c.0
version: f1
width: 32 bits
clock: 33MHz
capabilities: pci pciexpress msi pm normal_decode bus_master
cap_list
configuration: driver=pcieport
resources: irq:122 ioport:e000(size=4096) memory:ee000000-ef0fffff
ioport:d0000000(size=301989888)
*-display
description: 3D controller
product: NVIDIA Corporation
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@0000:01:00.0
version: a1
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list rom
configuration: driver=nvidia latency=0
resources: irq:135 memory:ee000000-eeffffff
memory:d0000000-dfffffff memory:e0000000-e1ffffff ioport:e000(size=128)
memory:ef000000-ef07ffff
*-pci:1
description: PCI bridge
product: Sunrise Point-LP PCI Express Root Port #7
vendor: Intel Corporation
physical id: 1c.6
bus info: pci@0000:00:1c.6
version: f1
width: 32 bits
clock: 33MHz
capabilities: pci pciexpress msi pm normal_decode bus_master
cap_list
configuration: driver=pcieport
resources: irq:123 memory:ef200000-ef2fffff
*-network
description: Wireless interface
product: Wireless 8265 / 8275
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:02:00.0
logical name: wlp2s0
version: 78
serial: e0:9d:31:f1:c0:f5
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet
physical wireless
configuration: broadcast=yes driver=iwlwifi
driverversion=4.15.18-041518-generic firmware=34.0.1 ip=192.168.111.56
latency=0 link=yes multicast=yes wireless=IEEE 802.11
resources: irq:142 memory:ef200000-ef201fff
*-pci:2
description: PCI bridge
product: Sunrise Point-LP PCI Express Root Port #9
vendor: Intel Corporation
physical id: 1d
bus info: pci@0000:00:1d.0
version: f1
width: 32 bits
clock: 33MHz
capabilities: pci pciexpress msi pm normal_decode bus_master
cap_list
configuration: driver=pcieport
resources: irq:124 memory:ef100000-ef1fffff
*-storage
description: Non-Volatile memory controller
product: Intel Corporation
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:03:00.0
version: 03
width: 64 bits
clock: 33MHz
capabilities: storage pm pciexpress msix nvm_express bus_master
cap_list
configuration: driver=nvme latency=0
resources: irq:16 memory:ef100000-ef103fff
*-generic:5
description: Signal processing controller
product: Sunrise Point-LP Serial IO UART Controller #0
vendor: Intel Corporation
physical id: 1e
bus info: pci@0000:00:1e.0
version: 21
width: 64 bits
clock: 33MHz
capabilities: pm bus_master cap_list
configuration: driver=intel-lpss latency=0
resources: irq:20 memory:ef332000-ef332fff
*-generic:6
description: Signal processing controller
product: Sunrise Point-LP Serial IO SPI Controller #0
vendor: Intel Corporation
physical id: 1e.2
bus info: pci@0000:00:1e.2
version: 21
width: 64 bits
clock: 33MHz
capabilities: pm bus_master cap_list
configuration: driver=intel-lpss latency=0
resources: irq:22 memory:ef331000-ef331fff
*-isa
description: ISA bridge
product: Intel Corporation
vendor: Intel Corporation
physical id: 1f
bus info: pci@0000:00:1f.0
version: 21
width: 32 bits
clock: 33MHz
capabilities: isa bus_master
configuration: latency=0
*-memory
description: Memory controller
product: Sunrise Point-LP PMC
vendor: Intel Corporation
physical id: 1f.2
bus info: pci@0000:00:1f.2
version: 21
width: 32 bits
clock: 33MHz (30.3ns)
configuration: driver=intel_pmc_core latency=0
resources: irq:0 memory:ef32c000-ef32ffff
*-multimedia
description: Audio device
product: Intel Corporation
vendor: Intel Corporation
physical id: 1f.3
bus info: pci@0000:00:1f.3
version: 21
width: 64 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list
configuration: driver=snd_hda_intel latency=32
resources: irq:139 memory:ef328000-ef32bfff
memory:ef300000-ef30ffff
*-serial UNCLAIMED
description: SMBus
product: Sunrise Point-LP SMBus
vendor: Intel Corporation
physical id: 1f.4
bus info: pci@0000:00:1f.4
version: 21
width: 64 bits
clock: 33MHz
configuration: latency=0
resources: memory:ef330000-ef3300ff ioport:f040(size=32)
$ uname -a
Linux roland-zenbook 4.15.18-041518-generic #201804190330 SMP Thu Apr 19
07:34:21 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
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https://bugs.launchpad.net/bugs/1721428
Title:
Artful (17.10) Session logout after screen turned off
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