I checked BIOS 8.10 (current version), and the ACPI device DD02 has
_BCL/_BCM/_BQC methods unlike the BIOS that fixed it in
https://bugs.launchpad.net/stella/hwe-stella/+bug/1023760/comments/13.
If the ACPI device LCD0 is used (ex. calling its _BCM), the brightness
will change accordingly. It seems newer BIOS from HP removed the
original fix.
I am not certain new BIOS update for this bug is possible since it is
from 2012...
** Changed in: hwe-next
Status: New => Incomplete
** Changed in: hwe-next
Assignee: Alex Hung (alexhung) => Anthony Wong (anthonywong)
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https://bugs.launchpad.net/bugs/1152544
Title:
HP Envy 23 AIO - No way to dim display
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