https://bugs.kde.org/show_bug.cgi?id=497823
--- Comment #2 from Karl-Johan Karlsson <creideiki+kdeb...@ferretporn.se> --- It looks like this is actually a kernel problem. I looked at my upgrade history, and noticed that Plasmashell hadn't been upgraded before I noticed the problem with the backlight, but KDE-Frameworks* had. I tried downgrading KDE-Frameworks from 6.9 to 6.7, and had the same problem. I then tried booting an older kernel, and didn't have the problem. Kernel 6.12.6 refuses to set brightness below 80%, with either KDE-Frameworks 6.7 or 6.9. Kernel 6.12.5 refuses to set brightness below 30%, with either KDE-Frameworks 6.7 or 6.9. Kernel 6.12.4 works, with either KDE-Frameworks 6.7 or 6.9. If I can manage to fit in a lot of compilation between Christmas stuff, I'll see if I can bisect the kernel to the exact problematic commit. In the mean time, could you check if booting an older kernel also fixes this for you? * KDE-Frameworks is a Gentoo package category. I tried downgrading just Solid, but the packages all have hard dependencies on exactly the same version, so I had to downgrade everything simultaneously. The packages are: $ equery list --format '$cpv:$slot' 'kde-frameworks/*' | grep -F :6 | sort kde-frameworks/attica-6.9.0:6/6.9 kde-frameworks/baloo-6.9.0:6/6.9 kde-frameworks/breeze-icons-6.9.0:6/6.9 kde-frameworks/frameworkintegration-6.9.0:6/6.9 kde-frameworks/karchive-6.9.0:6/6.9 kde-frameworks/kauth-6.9.0:6/6.9 kde-frameworks/kbookmarks-6.9.0:6/6.9 kde-frameworks/kcalendarcore-6.9.0:6/6.9 kde-frameworks/kcmutils-6.9.0:6/6.9 kde-frameworks/kcodecs-6.9.0:6/6.9 kde-frameworks/kcolorscheme-6.9.0:6/6.9 kde-frameworks/kcompletion-6.9.0:6/6.9 kde-frameworks/kconfig-6.9.0:6/6.9 kde-frameworks/kconfigwidgets-6.9.0:6/6.9 kde-frameworks/kcontacts-6.9.0:6/6.9 kde-frameworks/kcoreaddons-6.9.0:6/6.9 kde-frameworks/kcrash-6.9.0:6/6.9 kde-frameworks/kdav-6.9.0:6/6.9 kde-frameworks/kdbusaddons-6.9.0:6/6.9 kde-frameworks/kdeclarative-6.9.0:6/6.9 kde-frameworks/kded-6.9.0:6/6.9 kde-frameworks/kdesu-6.9.0:6/6.9 kde-frameworks/kdnssd-6.9.0:6/6.9 kde-frameworks/kdoctools-6.9.0:6/6.9 kde-frameworks/kf-env-6:6 kde-frameworks/kfilemetadata-6.9.0:6/6.9 kde-frameworks/kglobalaccel-6.9.0:6/6.9 kde-frameworks/kguiaddons-6.9.0-r1:6/6.9 kde-frameworks/kholidays-6.9.0:6/6.9 kde-frameworks/ki18n-6.9.0:6/6.9 kde-frameworks/kiconthemes-6.9.0:6/6.9 kde-frameworks/kidletime-6.9.0:6/6.9 kde-frameworks/kimageformats-6.9.0:6/6.9 kde-frameworks/kio-6.9.0:6/6.9 kde-frameworks/kirigami-6.9.0:6/6.9 kde-frameworks/kitemmodels-6.9.0:6/6.9 kde-frameworks/kitemviews-6.9.0:6/6.9 kde-frameworks/kjobwidgets-6.9.0:6/6.9 kde-frameworks/knewstuff-6.9.0:6/6.9 kde-frameworks/knotifications-6.9.0:6/6.9 kde-frameworks/knotifyconfig-6.9.0:6/6.9 kde-frameworks/kpackage-6.9.0:6/6.9 kde-frameworks/kparts-6.9.0:6/6.9 kde-frameworks/kpeople-6.9.0:6/6.9 kde-frameworks/kpty-6.9.0:6/6.9 kde-frameworks/kquickcharts-6.9.0:6/6.9 kde-frameworks/krunner-6.9.0:6/6.9 kde-frameworks/kservice-6.9.0:6/6.9 kde-frameworks/kstatusnotifieritem-6.9.0:6/6.9 kde-frameworks/ksvg-6.9.0:6/6.9 kde-frameworks/ktexteditor-6.9.0:6/6.9 kde-frameworks/ktexttemplate-6.9.0:6/6.9 kde-frameworks/ktextwidgets-6.9.0:6/6.9 kde-frameworks/kunitconversion-6.9.0:6/6.9 kde-frameworks/kwallet-6.9.0:6/6.9 kde-frameworks/kwidgetsaddons-6.9.0:6/6.9 kde-frameworks/kwindowsystem-6.9.0:6/6.9 kde-frameworks/kxmlgui-6.9.0:6/6.9 kde-frameworks/oxygen-icons-6.1.0:6 kde-frameworks/prison-6.9.0:6/6.9 kde-frameworks/purpose-6.9.0:6/6.9 kde-frameworks/qqc2-desktop-style-6.9.0:6/6.9 kde-frameworks/solid-6.9.1:6/6.9 kde-frameworks/sonnet-6.9.0:6/6.9 kde-frameworks/syntax-highlighting-6.9.0:6/6.9 kde-frameworks/threadweaver-6.9.0:6/6.9 -- You are receiving this mail because: You are watching all bug changes.
