Do you have a NVIDIA graphic card on your laptop? (check it with "lspci"
command in a terminal)
If so, please try to install the proprietary video driver first to see if this
can solve your problem.
** Changed in: linux-signed-hwe (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1846676
Title:
screen brightness cannot be adjusted
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