https://bugzilla.kernel.org/show_bug.cgi?id=62881

--- Comment #5 from Aaron Lu <[email protected]> ---
So this means acpi_video stops working after resume.

Does intel_backlight work before/after resume?
You can test it by echoing some value there, e.g.:
# cd /sys/class/backlight
# cat max_brightness
1024 (an example)
# echo 200 > brightness
see if backlight level changed
# echo 500 > brightness
etc.

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