https://bugzilla.kernel.org/show_bug.cgi?id=214899 --- Comment #3 from Johannes P (johannes.penssel@xxxxxxxxx) --- I'm specifying my command line via kernel config, so for some reason, it shows up in a separate message somewhat late in dmesg: [ 0.017237] Kernel command line: crypt_root=UUID=2cf18008-b55c-4f5f-926b-5f92a588348a root=UUID=c890d077-9357-4996-94a3-811d6f477c89 i915.enable_guc=2 iwlwifi.power_save=1 iwlmvm.power_scheme=3 snd-hda-intel.power_save_controller=1 acpi_backlight=vendor Possibly of note as well is that I am able to write custom values into /sys/class/backlight/ideapad/actual_brightness, which none of the other interfaces allows. ls -la /sys/class/backlight (with acpi_backlight=video) total 0 drwxr-xr-x 2 root root 0 Nov 1 21:28 . drwxr-xr-x 79 root root 0 Nov 1 21:28 .. lrwxrwxrwx 1 root root 0 Nov 1 21:28 acpi_video0 -> ../../devices/pci0000:00/0000:00:02.0/backlight/acpi_video0 lrwxrwxrwx 1 root root 0 Nov 1 21:28 acpi_video1 -> ../../devices/pci0000:00/0000:00:02.0/backlight/acpi_video1 lrwxrwxrwx 1 root root 0 Nov 1 21:28 intel_backlight -> ../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight I am afraid to report that booting with acpi_backlight=video did not help with the brightness keys :( -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
