STEPS TO REPRODUCE 1. Install kde in a minimal configuration state 2. log in 3. Find that night light has been turned on automatically. Turning it off and on again fixes this issue until the next login. OBSERVED RESULT Night Light turns on automatically, and at almost full strength. EXPECTED RESULT Night Light should not turn on upon login. SOFTWARE/OS VERSIONS Windows: macOS: (available in the Info Center app, or by running `kinfo` in a terminal window) Linux/KDE Plasma: KDE Plasma Version: 6.1.4 KDE Frameworks Version: Qt Version: 6.7.2 ADDITIONAL INFORMATION When the kernel is updated, this also triggers the bug. Output from DBUS while the bug is active (eg. Night Light is extraordinarily orange): Arguments: [Argument: a{sv} {"available" = [Variant(bool): true], "currentTemperature" = [Variant(uint): 6500], "daylight" = [Variant(bool): false], "enabled" = [Variant(bool): false], "inhibited" = [Variant(bool): false], "mode" = [Variant(uint): 2], "previousTransitionDateTime" = [Variant(qulonglong): 1726189200], "previousTransitionDuration" = [Variant(uint): 1800000], "running" = [Variant(bool): false], "scheduledTransitionDateTime" = [Variant(qulonglong): 1726232400], "scheduledTransitionDuration" = [Variant(uint): 1800000], "targetTemperature" = [Variant(uint): 3200]}]
After some further troubleshooting, I've found that the udevadm hook is the culprit, specifically when it runs this command: >sudo /usr/bin/udevadm trigger -c change /dev/dri/* It seems to trigger night light to run at full strength regardless of the device in the /dev/dri/ directory. Here is what my directory looks like: >$ ll /dev/dri >total 0 >drwxr-xr-x 3 root root 160 Sep 20 17:11 ./ >drwxr-xr-x 22 root root 4860 Sep 20 17:32 ../ >drwxr-xr-x 2 root root 140 Sep 20 17:11 by-path/ >crw-rw----+ 1 root video 226, 0 Sep 20 22:58 card0 >crw-rw----+ 1 root video 226, 1 Sep 20 22:58 card1 >crw-rw----+ 1 root video 226, 2 Sep 20 22:55 card2 >crw-rw-rw- 1 root render 226, 128 Sep 20 22:57 renderD128 >crw-rw-rw- 1 root render 226, 129 Sep 20 22:58 renderD129 Output of sudo udevadm test /dev/dri/renderD128 >$ sudo udevadm test /dev/dri/renderD128 This program is for debugging only, it does not run any program specified by a RUN key. It may show incorrect results, because some values may be different, or not available at a simulation run. Trying to open "/etc/systemd/hwdb/hwdb.bin"... Trying to open "/etc/udev/hwdb.bin"... Trying to open "/usr/lib/systemd/hwdb/hwdb.bin"... Trying to open "/usr/lib/udev/hwdb.bin"... === trie on-disk === tool version: 256 file size: 13112251 bytes header size 80 bytes strings 2658779 bytes nodes 10453392 bytes Loading kernel module index. Loaded 'libkmod.so.2' via dlopen() Found cgroup2 on /sys/fs/cgroup/, full unified hierarchy Found container virtualization none. Using default interface naming scheme 'v255'. Parsed configuration file "/usr/lib/systemd/network/99-default.link" Parsed configuration file "/usr/lib/systemd/network/80-vm-vt.link" Parsed configuration file "/usr/lib/systemd/network/80-namespace-ns.link" Parsed configuration file "/usr/lib/systemd/network/80-iwd.link" Parsed configuration file "/usr/lib/systemd/network/80-container-vz.link" Parsed configuration file "/usr/lib/systemd/network/80-container-ve.link" Parsed configuration file "/usr/lib/systemd/network/80-container-vb.link" Parsed configuration file "/usr/lib/systemd/network/80-6rd-tunnel.link" Created link configuration context. Reading rules file: /usr/lib/udev/rules.d/01-md-raid-creating.rules Reading rules file: /usr/lib/udev/rules.d/10-dm.rules Reading rules file: /usr/lib/udev/rules.d/11-dm-lvm.rules Reading rules file: /usr/lib/udev/rules.d/13-dm-disk.rules Reading rules file: /usr/lib/udev/rules.d/39-usbmuxd.rules Reading rules file: /usr/lib/udev/rules.d/40-brscan5.rules Reading rules file: /usr/lib/udev/rules.d/40-gphoto.rules Reading rules file: /usr/lib/udev/rules.d/40-monitor-hotplug.rules Reading rules file: /usr/lib/udev/rules.d/40-usb-media-players.rules Reading rules file: /usr/lib/udev/rules.d/45-i2c-tools.rules Reading rules file: /usr/lib/udev/rules.d/50-udev-default.rules Reading rules file: /usr/lib/udev/rules.d/51-android.rules Reading rules file: /usr/lib/udev/rules.d/60-autosuspend.rules Reading rules file: /usr/lib/udev/rules.d/60-block.rules Reading rules file: /usr/lib/udev/rules.d/60-cdrom_id.rules Reading rules file: /usr/lib/udev/rules.d/60-ddcutil-i2c.rules Reading rules file: /usr/lib/udev/rules.d/60-ddcutil-usb.rules Reading rules file: /usr/lib/udev/rules.d/60-dmi-id.rules Reading rules file: /usr/lib/udev/rules.d/60-drm.rules Reading rules file: /usr/lib/udev/rules.d/60-evdev.rules Reading rules file: /usr/lib/udev/rules.d/60-fido-id.rules Reading rules file: /usr/lib/udev/rules.d/60-infiniband.rules Reading rules file: /usr/lib/udev/rules.d/60-input-id.rules Reading rules file: /usr/lib/udev/rules.d/60-nvidia.rules Reading rules file: /usr/lib/udev/rules.d/60-persistent-alsa.rules Reading rules file: /usr/lib/udev/rules.d/60-persistent-input.rules Reading rules file: /usr/lib/udev/rules.d/60-persistent-storage-mtd.rules Reading rules file: /usr/lib/udev/rules.d/60-persistent-storage-tape.rules Reading rules file: /usr/lib/udev/rules.d/60-persistent-storage.rules Reading rules file: /usr/lib/udev/rules.d/60-persistent-v4l.rules Reading rules file: /usr/lib/udev/rules.d/60-rfkill.rules Reading rules file: /usr/lib/udev/rules.d/60-sensor.rules Reading rules file: /usr/lib/udev/rules.d/60-serial.rules Reading rules file: /etc/udev/rules.d/60-steam-input.rules Reading rules file: /etc/udev/rules.d/60-steam-vr.rules Reading rules file: /usr/lib/udev/rules.d/60-tpm-udev.rules Reading rules file: /usr/lib/udev/rules.d/60-upower-battery.rules Reading rules file: /usr/lib/udev/rules.d/60-vboxdrv.rules Reading rules file: /usr/lib/udev/rules.d/63-md-raid-arrays.rules Reading rules file: /usr/lib/udev/rules.d/64-btrfs-dm.rules Reading rules file: /usr/lib/udev/rules.d/64-btrfs-zoned.rules Reading rules file: /usr/lib/udev/rules.d/64-btrfs.rules Reading rules file: /usr/lib/udev/rules.d/64-ext4.rules Reading rules file: /usr/lib/udev/rules.d/64-md-raid-assembly.rules Reading rules file: /usr/lib/udev/rules.d/65-libwacom.rules Reading rules file: /usr/lib/udev/rules.d/65-sane.rules Reading rules file: /usr/lib/udev/rules.d/66-saned.rules Reading rules file: /usr/lib/udev/rules.d/69-dm-lvm.rules Reading rules file: /usr/lib/udev/rules.d/69-libmtp.rules Reading rules file: /usr/lib/udev/rules.d/69-md-clustered-confirm-device.rules Reading rules file: /usr/lib/udev/rules.d/70-camera.rules Reading rules file: /usr/lib/udev/rules.d/70-infrared.rules Reading rules file: /usr/lib/udev/rules.d/70-joystick.rules Reading rules file: /usr/lib/udev/rules.d/70-memory.rules Reading rules file: /usr/lib/udev/rules.d/70-mouse.rules Reading rules file: /usr/lib/udev/rules.d/70-power-switch.rules Reading rules file: /usr/lib/udev/rules.d/70-steam-input.rules Reading rules file: /usr/lib/udev/rules.d/70-steam-vr.rules Reading rules file: /usr/lib/udev/rules.d/70-touchpad.rules Reading rules file: /usr/lib/udev/rules.d/70-uaccess.rules Reading rules file: /usr/lib/udev/rules.d/71-seat.rules Reading rules file: /usr/lib/udev/rules.d/73-seat-late.rules Reading rules file: /usr/lib/udev/rules.d/75-net-description.rules Reading rules file: /usr/lib/udev/rules.d/75-probe_mtd.rules Reading rules file: /usr/lib/udev/rules.d/78-sound-card.rules Reading rules file: /usr/lib/udev/rules.d/80-drivers.rules Reading rules file: /usr/lib/udev/rules.d/80-libinput-device-groups.rules Reading rules file: /usr/lib/udev/rules.d/80-net-setup-link.rules Reading rules file: /usr/lib/udev/rules.d/80-udisks2.rules Reading rules file: /usr/lib/udev/rules.d/81-net-dhcp.rules Reading rules file: /usr/lib/udev/rules.d/85-regulatory.rules Reading rules file: /usr/lib/udev/rules.d/90-iocost.rules Reading rules file: /usr/lib/udev/rules.d/90-libinput-fuzz-override.rules Reading rules file: /usr/lib/udev/rules.d/90-pipewire-alsa.rules Reading rules file: /usr/lib/udev/rules.d/90-vconsole.rules Reading rules file: /usr/lib/udev/rules.d/95-dm-notify.rules Reading rules file: /usr/lib/udev/rules.d/95-upower-hid.rules Reading rules file: /usr/lib/udev/rules.d/95-upower-wup.rules Reading rules file: /usr/lib/udev/rules.d/96-e2scrub.rules Reading rules file: /usr/lib/udev/rules.d/99-fuse.rules Reading rules file: /usr/lib/udev/rules.d/99-fuse3.rules Reading rules file: /usr/lib/udev/rules.d/99-systemd.rules renderD128: /usr/lib/udev/rules.d/50-udev-default.rules:56 GROUP 989 renderD128: /usr/lib/udev/rules.d/50-udev-default.rules:56 MODE 0666 renderD128: /usr/lib/udev/rules.d/60-drm.rules:3 Importing properties from results of builtin command 'path_id' renderD128: /usr/lib/udev/rules.d/60-drm.rules:10 Added SYMLINK 'dri/by-path/pci-0000:01:00.0-render' Properties: DEVPATH=/devices/pci0000:00/0000:00:01.1/0000:01:00.0/drm/renderD128 DEVNAME=/dev/dri/renderD128 DEVTYPE=drm_minor MAJOR=226 MINOR=128 SUBSYSTEM=drm ACTION=add ID_PATH=pci-0000:01:00.0 ID_PATH_TAG=pci-0000_01_00_0 DEVLINKS=/dev/dri/by-path/pci-0000:01:00.0-render USEC_INITIALIZED=6072254 Device node symlinks: (priority=0) /dev/dri/by-path/pci-0000:01:00.0-render Inotify watch: disabled Device node group: render (gid=989) Device node permission: 0666 Unload kernel module index. Unloaded link configuration context.
Solved by removing autorandr.
Since this issue is caused by autorandr, it's not something KDE can fix.