https://bugs.kde.org/show_bug.cgi?id=525627
Zurg <[email protected]> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |[email protected] --- Comment #1 from Zurg <[email protected]> --- I can confirm the same underlying issue on different hardware: - Acer Aspire VN7-592G - Arch Linux, kernel 7.2.4-arch1-2 - plasmashell 6.7.5 Same as the original report: no /sys/class/leds/*kbd* (or similarly named) device exists under /sys/class/leds/, and the keyboard backlight is toggled directly by the EC. However, pressing the Fn backlight key does still generate a notification to the OS: $ sudo acpi_listen wmi PNP0C14:01 000000bc 00000000 dmesg shows the kernel's acer_wmi driver receives this event but does not implement it: acer_wmi: Unknown function number - 6 - 1 So on this hardware it's specifically acer_wmi failing to expose a real backlight level for this WMI function number (rather than a complete absence of OS-level notification) — but the end result for upower/Plasma is the same: no valid brightness can ever be read, and the "Keyboard Backlight" slider is shown with nan% instead of being hidden. Possibly related, though the symptom pattern differs (slider works initially, then degrades to nan% after being moved, rather than nan% from the start): bug 525640. -- You are receiving this mail because: You are watching all bug changes.
