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On my Toshiba laptop I have two backlight devices in /sys/class/backlight called toshiba and intel_backlight. In Xorg, you could create a .conf file to choose which one the system should use. How do I do that in Wayland?

  • You don't. This is a great question to ask on the #wayland channel. – ybakos Mar 27 '16 at 15:53
  • A little digging shows support is based on the display server implementation. For example, here's something related to Weston – ybakos Mar 27 '16 at 16:09
  • This long-standing issue with brightness control has been finally solved at it's source, the kernel module. – To Do Mar 28 '16 at 10:22
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To clarify, you don't "do it in Wayland," since Wayland is just a protocol. It seems that configuring the backlight will need to be done based on either drm configuration and/or the particular display server config.

The details for Weston are in the backlight_init function in libbacklight.c.

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