https://bugzilla.kernel.org/show_bug.cgi?id=208341

--- Comment #5 from Mik (e...@gmx.com) ---
This new patch does not help = permanent dark state. The same undesirable
effect is present, but increasing brightness has no effect now. Energy saving
must be set on AC power and on Battery that way:

Screen Brightness enabled with maximum level for both. Apply change removes the
bug. 

Set that way, removing the PS reduces brightness to minimum and reconnecting it
restores normal state. No need to increase it manually. Again, this is a one
shot bug on boot or after restart.

20200630
Packages (23) breeze-git-5.19.80.r2009.g0fefe7fb-1 
breeze-icons-git-5.72.0.r1576.gab758050-1  kcmutils-git-5.72.0.r409.g4ba2fe6-1
              kcoreaddons-git-5.72.0.r989.g9748cbc-1 
kdeplasma-addons-git-5.19.80.r8356.ge7ab2f301-1
              kio-git-5.72.0.r4083.ge65ea9e8-1 
kirigami2-git-5.72.0.r2249.gfd6e6138-1 
knetattach-git-5.19.80.r7719.g8d926a3f8-1
              kpty-git-5.72.0.r264.g690ee7c-1 
ksshaskpass-git-5.19.80.r172.g01b5517-1 
ksysguard-git-5.19.80.r3294.g8c4049fe-1
              ktexteditor-git-5.72.0.r2378.g71b4295a-1 
kwallet-git-5.72.0.r972.g032a2b8-1
              kwidgetsaddons-git-5.72.0.r691.g1c648fb-1 
kwin-git-5.19.80.r18115.g1b4c725d1-1  kxmlgui-git-5.72.0.r633.gd5d05d1-1
              libkscreen-git-5.19.80.r1525.g1b78ba2-1 
plasma-desktop-git-5.19.80.r7719.g8d926a3f8-1
              plasma-framework-git-5.72.0.r15467.g7c4f5c5f1-1 
plasma-nm-git-5.19.80.r2895.ga0455c31-1
              plasma-wayland-session-git-5.19.80.r9170.g0ec7a3e2c-1 
plasma-workspace-git-5.19.80.r9170.g0ec7a3e2c-1
              powerdevil-git-5.19.80.r2321.gfcb26be2-1

With the new parameters (energy saving) removing/reconnecting the PS:  

journalctl -f
-- Logs begin at Mon 2020-06-29 07:24:14 EDT. --
Jun 30 19:23:55 kk dbus-daemon[1044]: [session uid=1000 pid=1044] Activating
via systemd: service name='org.gtk.vfs.Daemon' unit='gvfs-daemon.service'
requested by ':1.38' (uid=1000 pid=1236 comm="/usr/lib/DiscoverNotifier ")
Jun 30 19:23:55 kk systemd[849]: Starting Virtual filesystem service...
Jun 30 19:23:55 kk dbus-daemon[1044]: [session uid=1000 pid=1044] Successfully
activated service 'org.gtk.vfs.Daemon'
Jun 30 19:23:55 kk systemd[849]: Started Virtual filesystem service.
Jun 30 19:23:55 kk kernel: fuse: init (API version 7.31)
Jun 30 19:23:55 kk systemd[1]: Mounting FUSE Control File System...
Jun 30 19:23:55 kk systemd[1]: Mounted FUSE Control File System.
Jun 30 19:23:56 kk PackageKit[1272]: get-updates transaction /1_ccababae from
uid 1000 finished with success after 818ms
Jun 30 19:24:00 kk kdeconnectd[1245]: kdeconnect.core: Could not query
capabilities from notifications server
Jun 30 19:24:01 kk systemd-timesyncd[498]: Initial synchronization to time
server 192.207.62.39:123 (2.manjaro.pool.ntp.org).
Jun 30 19:24:05 kk systemd[1]: systemd-hostnamed.service: Succeeded.
Jun 30 19:24:05 kk audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295
ses=4294967295 msg='unit=systemd-hostnamed comm="systemd"
exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Jun 30 19:24:05 kk kernel: audit: type=1131 audit(1593559445.874:59): pid=1
uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-hostnamed comm="systemd"
exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Jun 30 19:24:06 kk audit: BPF prog-id=10 op=UNLOAD
Jun 30 19:24:06 kk audit: BPF prog-id=9 op=UNLOAD
Jun 30 19:24:06 kk kernel: audit: type=1334 audit(1593559446.069:60):
prog-id=10 op=UNLOAD
Jun 30 19:24:06 kk kernel: audit: type=1334 audit(1593559446.069:61): prog-id=9
op=UNLOAD
Jun 30 19:24:14 kk dbus-daemon[750]: [system] Activating service
name='org.kde.powerdevil.backlighthelper' requested by ':1.42' (uid=1000
pid=1348 comm="/usr/lib/org_kde_powerdevil ") (using servicehelper)
Jun 30 19:24:14 kk dbus-daemon[750]: [system] Successfully activated service
'org.kde.powerdevil.backlighthelper'

Still not able to reproduce the bug on stable Kernel. This is the only bug
present on Kernel 5.8.

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