Well, this is a feature that is presents in most displays, but is hardly ever used by software.
Xorg could handle backlight of notebook displays, but not of standalone displays. There is a project called ddccontrol: http://ddccontrol.sourceforge.net/ The core of this project is not really tough to implement inside Mir, because it is just a simple wrapper of I2C protocol. Practical usage: - Unified backlight interface (ACPI from notebooks, DDC/CI, maybe, HDMI) - Ability to control display backlight from System Settings, xbacklight (well, mirbacklight, of course ;) ) and from any other display tool. - Ability to create such a cool feature as automatic backlight (using a webcam). So, is there a possibility to include DDC support in Mir?
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