Keyboard backlight on Acer Nitro AN515-58 turns off as soon as Pop!_OS boots and never turns back on via four_zone_mode/per_zone_mode, even on driver 25.701 (which added AN515-58 support). Hardware is confirmed healthy — BIOS/POST lights the keyboard normally with timeout disabled. Writes to sysfs succeed and read back correctly, but produce no corresponding kernel EC/WMI trace (unlike every other feature), suggesting the "set" call silently no-ops on this BIOS revision (V2.21).
Keyboard backlight on Acer Nitro AN515-58 turns off as soon as Pop!_OS boots and never turns back on via four_zone_mode/per_zone_mode, even on driver 25.701 (which added AN515-58 support). Hardware is confirmed healthy — BIOS/POST lights the keyboard normally with timeout disabled. Writes to sysfs succeed and read back correctly, but produce no corresponding kernel EC/WMI trace (unlike every other feature), suggesting the "set" call silently no-ops on this BIOS revision (V2.21).