https://bugzilla.kernel.org/show_bug.cgi?id=91191

Aaron Lu <[email protected]> changed:

           What    |Removed                     |Added
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                 CC|                            |[email protected]

--- Comment #6 from Aaron Lu <[email protected]> ---
Please check which backlight interface the X is using in /var/log/Xorg.0.log

Also, if you directly change the brightness file, will such error occur?
# cd /sys/class/backlight/radeon?
# cat max_brightness
# echo a_value_smaller_than_max_brightness > brightness

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