I'm on a Thinkpad T530 which is an Optimus setup. There are two backlight providers: /sys/class/backlight/intel_backlight /sys/class/backlight/nv_backlight Both are type raw. Only intel_backlight controls the actual brightness of the screen. gnome-settings-daemon works correctly on my hardware. They seem to be checking if *_backlight/device/enabled is actually reading "enabled" and using that one. As best I can tell, in xfpm-backlight-helper.c it's just looping through all of the available interfaces and picking the last one that shows up (in this case, nv_backlight which is alphabetically last and also wrong). Unfortunately I don't know enough about gobject and udev to write an actual *good* patch that's submitted, but if we can check for device/enabled == "enabled" and use that instead of just looping through them that should fix the issue.
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