Public bug reported:
Without a 'sleep 1' before +dpms command, slock or xtrlock, etc. will
cause a laptop backlight to immediately reactivate.
description: Notebook
product: 4180AP3
vendor: LENOVO
version: ThinkPad T420
*-firmware
description: BIOS
vendor: LENOVO
physical id: d
version: 83ET82WW (1.52 )
date: 06/04/2018
size: 128KiB
capacity: 8128KiB
capabilities: pci pnp upgrade shadowing cdboot bootselect edd
int13floppy720 int5printscreen int9keyboard int14serial int17printer int10video
acpi usb biosbootspecification
*-display
description: VGA compatible controller
product: 2nd Generation Core Processor Family Integrated Graphics
Controller
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 09
width: 64 bits
clock: 33MHz
capabilities: msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:26 memory:f0000000-f03fffff
memory:e0000000-efffffff ioport:4000(size=64) memory:c0000-dffff
ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: xfce4-session 4.12.1-3ubuntu4 [modified: usr/bin/xflock4]
ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
Uname: Linux 4.18.0-10-generic x86_64
ApportVersion: 2.20.10-0ubuntu13
Architecture: amd64
CurrentDesktop: XFCE
Date: Wed Nov 7 10:11:37 2018
InstallationDate: Installed on 2018-11-04 (2 days ago)
InstallationMedia: Xubuntu 18.10 "Cosmic Cuttlefish" - Release amd64
(20181017.2)
SourcePackage: xfce4-session
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: xfce4-session (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug cosmic intel xubuntu
** Patch added: "sleep added."
https://bugs.launchpad.net/bugs/1802138/+attachment/5210073/+files/xflock4.patch
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https://bugs.launchpad.net/bugs/1802138
Title:
xflock4 needs a 'sleep 1' before 'xset dpms force off' to prevent
backlight from immediately reactivating
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