aleksejshilin added a comment.
I've created a script to demonstrate the issue (attached). It uses VLC to acquire inhibition after the screen is dimmed. Usage: ./test_restore_brightness.sh <video file>F5451108: test_restore_brightness.sh <https://phabricator.kde.org/F5451108> REPOSITORY R122 Powerdevil REVISION DETAIL https://phabricator.kde.org/D8502 To: aleksejshilin, #plasma Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart