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A comment on VESA Publishes DisplayPort 2.0 Video Standard. Parent comment
As noted in discussion, Luminance VCD while worked for my monitors, backlight level 0x6B or legacy 0x13 would be better choice.
It then can be used by instantiating it at proper I²C monitor bus, e.g.:
insmod ddcci_bl.ko modprobe i2c-dev echo ddcci_bl 0x37 > /sys/bus/i2c/devices/i2c-2/new_device
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As noted in discussion, Luminance VCD while worked for my monitors, backlight level 0x6B or legacy 0x13 would be better choice.
It then can be used by instantiating it at proper I²C monitor bus, e.g.:
(oh, and it now over 2 years and I still haven't got time to integrate it with DRM display hotplug so it could be upstreamed :(