[Bug 428054] Re: xrandr backlight property control missing (when using KMS?)

[trendzetter]

People looking for a temporary workaround can try this:
Add GRUB_CMDLINE_LINUX="nomodeset acpi_backlight=vendor" in /etc/default/grub and run update-grub.

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xrandr backlight property control missing (when using KMS?)
https://bugs.launchpad.net/bugs/428054
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