FS#72893 - intel_backlight/brightness has no effect when modified on CometLake-H GT2
Attached to Project:
Arch Linux
Opened by Moody (Moody) - Wednesday, 01 December 2021, 16:59 GMT
Last edited by Sven-Hendrik Haase (Svenstaro) - Monday, 07 February 2022, 07:04 GMT
Opened by Moody (Moody) - Wednesday, 01 December 2021, 16:59 GMT
Last edited by Sven-Hendrik Haase (Svenstaro) - Monday, 07 February 2022, 07:04 GMT
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Details
Description:
I have a laptop Lenovo Legion Y7000P2020H, while it's possible to adjust the backlight in discrete GPU, however, when set to "Hybrid" mode in BIOS, the `intel_backlight/brightness` has no effect on the actual screen backlight. There's no hardware brightness key on the keyboard. Details: uname -a: > Linux arch 5.16.0-rc3-1-mainline #1 SMP PREEMPT Mon, 29 Nov 2021 21:15:09 +0000 x86_64 GNU/Linux /sys/class/backlight/intel_backlight/max_brightness: 26666 /sys/class/backlight/intel_backlight/bl_power: 0 (When set to 1, the backlight turns off) /sys/class/backlight/intel_backlight/brightness: 1333 (Has no effects whenever set to a non-zero value, zero causes a blackscreen) /sys/class/backlight/intel_backlight/type: "raw" Kernel Parameters: `root=/dev/mapper/archroot rw resume=UUID=6514112c-9b82-4b82-b2a8-2bd2b372f2ae loglevel=15` Tried parameters: i915.enable_dpcd_backlight=0 i915.enable_dpcd_backlight=1 acpi_backlight=video acpi_backlight=vendor acpi_backlight=native Additional info: * package version(s) Name : linux-mainline Version : 5.16rc3-1 * config and/or log files etc. Attached * The brightness adjustment works in Windows, so it's probably not a hardware problem. |
This task depends upon
Closed by Sven-Hendrik Haase (Svenstaro)
Monday, 07 February 2022, 07:04 GMT
Reason for closing: Fixed
Additional comments about closing: 2022-01-28: A task closure has been requested. Reason for request: This has been fixed in a newer kernel version, which introduced a new module named `nvidia_wmi_ec_backlight`.
Monday, 07 February 2022, 07:04 GMT
Reason for closing: Fixed
Additional comments about closing: 2022-01-28: A task closure has been requested. Reason for request: This has been fixed in a newer kernel version, which introduced a new module named `nvidia_wmi_ec_backlight`.
` and the problem exists as well.