https://bugzilla.kernel.org/show_bug.cgi?id=221859
Devyansh Karma ([email protected]) changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |[email protected] --- Comment #1 from Devyansh Karma ([email protected]) --- I can reproduce this issue on Kali Linux Rolling 2026.3 on a Lenovo LOQ 15ARP9 (Type 83JC), BIOS PQCN31WW. Kernel: 6.19.14+kali-amd64 GPU: NVIDIA GeForce RTX 3050 Laptop GPU (AD107M) Active GPU driver: Nouveau My kernel log shows: ACPI: \_SB_.PCI0.GPP0.PEGP.LCD0: _BCM evaluation failed The only initial backlight interface is acpi_video0, with max_brightness 49. Writing different values to its brightness file changes the reported value but does not physically change screen brightness. I also tested nvidia_wmi_ec_backlight with force=1. This created a second interface with max_brightness 800, but writing 250 to its brightness file also produced no physical brightness change. My BIOS is PQCN31WW. The BIOS release notes list security fixes but no brightness or ACPI fix. Could you advise whether a kernel ACPI/DMI quirk or another workaround is available for this laptop? -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug. _______________________________________________ acpi-bugzilla mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/acpi-bugzilla
