https://bugzilla.kernel.org/show_bug.cgi?id=216954
Bug ID: 216954
Summary: display backlight not worked at kernel above 6.1.3
Product: ACPI
Version: 2.5
Kernel Version: 6.1.5
Hardware: AMD
OS: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: Other
Assignee: acpi_ot...@kernel-bugs.osdl.org
Reporter: bogdan.pylypenko...@gmail.com
Regression: No
HP Pavilion Gaming laptop 15-ec1002ur;
AMD Ryzen 5 4600H;
Gentoo, Cinnamon-5.6.0;
Details about system: https://linux-hardware.org/?probe=7aa00b2d9f
Display backlight function is controlled by Fn+F2 (backlight down) and Fn+F3
(backlight up) key sequences. No need any configuration for set up key
sequences - they are worked natively in X subsystem (Cinnamon, KDE, Gnome).
acpid daemon not configured to use those key-sequences.
kernel 6.1.3 - backlight worked:
> # find /sys -name "*backlight*"
> /sys/class/backlight
> /sys/devices/pci0000:00/0000:00:08.1/0000:05:00.0/backlight
> /sys/bus/platform/drivers/pwm-backlight
> /sys/module/video/parameters/register_backlight_delay
> /sys/module/amdgpu/parameters/backlight
kernel 6.1.5, 6.1.6 and 6.1.7 - backlight not worked:
> # find /sys -name "*backlight*"
> /sys/class/backlight
> /sys/bus/platform/drivers/pwm-backlight
> /sys/module/video/parameters/register_backlight_delay
> /sys/module/amdgpu/parameters/backlight
E.g.: backlight device not found.
Press any of Fn+F2 or Fn+F3 key sequence produce messages in syslog:
> kernel: atkbd serio0: Unknown key pressed (translated set 2, code 0xab on
> isa0060/serio0).
> kernel: atkbd serio0: Use 'setkeycodes e02b <keycode>' to make it known.
> pkexec[24931]: pam_unix(polkit-1:session): session opened for user
> root(uid=0) by (uid=1000)
> pkexec[24931]: username: Executing command [USER=root] [TTY=unknown]
> [CWD=/home/username] [COMMAND=/usr/libexec/csd-backlight-helper
> --set-brightness 88 -b firmware -b platform -b raw]
> kernel: atkbd serio0: Unknown key released (translated set 2, code 0xab on
> isa0060/serio0).
> kernel: atkbd serio0: Use 'setkeycodes e02b <keycode>' to make it known.
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