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linuxkpi: Add backlight support

Description

linuxkpi: Add backlight support

Add backlight function to linuxkpi.
Graphics drivers expose the backlight of the panel directly so allow them to use the backlight subsystem so
user can use backlight(8) to configure them.

Reviewed by: hselasky
Relnotes: yes
Differential Revision: The FreeBSD Foundation

Details

Provenance
manuAuthored on
Parents
rS366371: Add pwm_backlight
Branches
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Tags
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