Cannot turn off laptop LED using Monitor Settings

[Rohit]

(PS This is my first time reporting a bug, please be gentle if this is the wrong package for this)

My setup is a laptop connected to an external HDMI TV.

When I turn off the laptop LCD using Preferences->Monitor Settings, the laptop LED turns off and the HDMI TV gets a non-responsive display. The system hangs and the only way out is to reboot the system.

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: sddm-theme-lubuntu 19.04.2
ProcVersionSignature: Ubuntu 5.0.0-20.21-generic 5.0.8
Uname: Linux 5.0.0-20-generic x86_64
ApportVersion: 2.20.10-0ubuntu27
Architecture: amd64
CurrentDesktop: LXQt
Date: Fri Jul 5 22:32:50 2019
InstallationDate: Installed on 2018-05-20 (411 days ago)
InstallationMedia: Lubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
SourcePackage: lubuntu-artwork
UpgradeStatus: Upgraded to disco on 2019-07-06 (0 days ago)

[ԜаӀtеr Ⅼарсһуnѕkі (wxl)]

Is this still an issue?

[Rohit (proteus-1)]

I no longer have that laptop to test. But until the time I used it, the issue wasn't resolved.