Laptop screen dim on battery power

To: debian-user <debian-user@lists.debian.org>
Subject: Laptop screen dim on battery power
From: Richard Owlett <rowlett@access.net>
Date: Sun, 1 Sep 2024 05:15:01 -0500
Message-id: <[🔎] f8ebc0d0-2ba6-2d77-e0a4-92ef1a830489@access.net>

Lenovo R61 ThinkPad
Debian 10.0 MATE 1.20.4
The screen automatically dims when AC removed.
System->Hardware->Power Management->OnBatteryPower->Display
"Reduce backlight brightness" & "Dim display when idle" unchecked

Any where else to look?
TIA

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